每轮只推进合理适量的上下文、禁止顺手扩功能 smoke：源码链接构建约束

analyze-linuxcnc-wasm-blockers.sh

@@ -6,7 +6,8 @@ cd "$(dirname "$0")"
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 manifest=${1:-linuxcnc-rs274-wasm-source-files.txt}
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh "$manifest"
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 
 python_blockers=()
 core_python_sources=()
@@ -53,19 +54,38 @@ wasm_safe_shim_in_build() {
     return 1
 }
 
-core_source_output=$(./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core)
-mapfile -t core_sources <<<"$core_source_output"
-blocked_source_output=$(./list-linuxcnc-wasm-manifest-sources.sh "$manifest" blocked)
-mapfile -t blocked_sources <<<"$blocked_source_output"
+core_sources=()
+blocked_sources=()
+while IFS=: read -r group path note extra; do
+    case "$group" in
+        ""|\#*)
+            continue
+            ;;
+        core)
+            core_sources+=("$path")
+            ;;
+        blocked)
+            blocked_sources+=("$path")
+            ;;
+        header|metadata|blocked-header)
+            ;;
+        *)
+            echo "unknown manifest group: $group" >&2
+            exit 1
+            ;;
+    esac
+done < "$manifest"
 core_count=${#core_sources[@]}
 blocked_count=${#blocked_sources[@]}
 
 scan_source() {
     local group=$1
     local path=$2
-    full_path=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-files.sh \
-        --missing-message "missing manifest source" \
-        "$path")
+    full_path="$linuxcnc_root/$path"
+    if [[ ! -f "$full_path" ]]; then
+        echo "missing manifest source: $path" >&2
+        exit 1
+    fi
     if [[ "$group" == "blocked" ]]; then
         if ! replacement=$(blocked_replacement_for "$path"); then
             echo "missing blocked replacement mapping: $path" >&2

build-linuxcnc-native-bridge-objects.sh

@@ -0,0 +1,101 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+cxx=${CXX:-g++}
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+cache_dir=${CNC_SIM_NATIVE_BRIDGE_OBJECT_CACHE_DIR-build/native-bridge-object-cache}
+if [[ -z "$cache_dir" ]]; then
+    echo "CNC_SIM_NATIVE_BRIDGE_OBJECT_CACHE_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$cache_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_NATIVE_BRIDGE_OBJECT_CACHE_DIR must not contain whitespace: $cache_dir" >&2
+    exit 1
+fi
+mkdir -p "$cache_dir"
+cache_dir=$(cd "$cache_dir" && pwd)
+if [[ "$cache_dir" == "/" ]]; then
+    echo "CNC_SIM_NATIVE_BRIDGE_OBJECT_CACHE_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 8>"$cache_dir/native-bridge-objects.lock"
+flock 8
+
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-"$cache_dir/preflight-cache"}
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
+
+source_output=$(./list-linuxcnc-bridge-smoke-project-sources.sh)
+mapfile -t sources <<<"$source_output"
+common_flag_output=$(
+    CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" \
+        LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-common-cxxflags.sh \
+        --no-ulapi \
+        --core-include \
+        --core-src
+)
+mapfile -t common_flags <<<"$common_flag_output"
+
+objects=()
+source_index=0
+for source in "${sources[@]}"; do
+    objects+=("$cache_dir/source_${source_index}.o")
+    source_index=$((source_index + 1))
+done
+
+signature="$cache_dir/native-bridge-objects.signature"
+next_signature="$cache_dir/native-bridge-objects.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'SOURCES:\n'
+    printf '%s\n' "${sources[@]}"
+} > "$next_signature"
+if [[ ! -f "$signature" ]] || ! cmp -s "$signature" "$next_signature"; then
+    rm -f "$cache_dir"/source_*.o "$cache_dir"/source_*.d
+fi
+mv "$next_signature" "$signature"
+
+makefile="$cache_dir/native-bridge-objects.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n\n'
+    printf 'OBJECTS :='
+    printf ' %s' "${objects[@]}"
+    printf '\n\n'
+    printf 'DEP_FILES :=\n'
+    for object in "${objects[@]}"; do
+        printf 'DEP_FILES += %s.d\n' "$object"
+    done
+    printf '\n.PHONY: all\n'
+    printf 'all: $(OBJECTS)\n\n'
+
+    source_index=0
+    for source in "${sources[@]}"; do
+        printf '%s: %s\n' "${objects[$source_index]}" "$source"
+        printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n' \
+            "${objects[$source_index]}" "$source" "${objects[$source_index]}"
+        source_index=$((source_index + 1))
+    done
+    printf '\n-include $(DEP_FILES)\n'
+} > "$makefile"
+make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null
+
+printf '%s\n' "${objects[@]}"

build-linuxcnc-wasm-link-probe.sh

@@ -0,0 +1,145 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+usage() {
+    echo "usage: $0 --mode rs274ngc-pre|runtime [manifest]" >&2
+}
+
+mode=
+manifest=linuxcnc-rs274-wasm-source-files.txt
+while [[ "$#" -gt 0 ]]; do
+    case "$1" in
+        --mode)
+            if [[ "$#" -lt 2 ]]; then
+                echo "missing --mode value" >&2
+                exit 1
+            fi
+            mode=$2
+            shift 2
+            ;;
+        --help|-h)
+            usage
+            exit 0
+            ;;
+        --*)
+            usage
+            echo "unknown wasm link probe option: $1" >&2
+            exit 1
+            ;;
+        *)
+            manifest=$1
+            shift
+            ;;
+    esac
+done
+case "$mode" in
+    rs274ngc-pre|runtime)
+        ;;
+    "")
+        usage
+        echo "missing --mode" >&2
+        exit 1
+        ;;
+    *)
+        usage
+        echo "unknown wasm link probe mode: $mode" >&2
+        exit 1
+        ;;
+esac
+
+linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+cxx=${CXX:-g++}
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+cache_dir=${CNC_SIM_WASM_LINK_PROBE_CACHE_DIR-build/wasm-link-probe-cache}
+if [[ -z "$cache_dir" ]]; then
+    echo "CNC_SIM_WASM_LINK_PROBE_CACHE_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$cache_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_WASM_LINK_PROBE_CACHE_DIR must not contain whitespace: $cache_dir" >&2
+    exit 1
+fi
+mkdir -p "$cache_dir"
+cache_dir=$(cd "$cache_dir" && pwd)
+if [[ "$cache_dir" == "/" ]]; then
+    echo "CNC_SIM_WASM_LINK_PROBE_CACHE_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-"$cache_dir/preflight-cache"}
+object_mode=$mode
+main_source=core/wasm_shims/rs274ngc_pre_probe_main.cc
+target_name=rs274ngc_pre_probe
+common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh --profile core20-sections)
+mapfile -t common_flags <<<"$common_flag_output"
+case "$mode" in
+    runtime)
+        object_mode=runtime
+        main_source=core/wasm_shims/cnc_sim_wasm_runtime_probe_main.cc
+        target_name=cnc_sim_wasm_runtime_probe
+        common_flags+=(-DCNC_SIM_ENABLE_LINUXCNC_RS274_BACKEND)
+        ;;
+esac
+
+object_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./build-linuxcnc-wasm-probe-objects.sh --mode "$object_mode" "$manifest")
+mapfile -t objects <<<"$object_output"
+manifest=$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
+
+mode_dir="$cache_dir/$mode"
+mkdir -p "$mode_dir"
+exec 8>"$mode_dir/link.lock"
+flock 8
+
+main_object="$mode_dir/main.o"
+target="$mode_dir/$target_name"
+signature="$mode_dir/link.signature"
+next_signature="$mode_dir/link.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'MANIFEST=%s\n' "$manifest"
+    printf 'MODE=%s\n' "$mode"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'MAIN_SOURCE=%s\n' "$main_source"
+    printf 'OBJECTS:\n'
+    printf '%s\n' "${objects[@]}"
+} > "$next_signature"
+if [[ ! -f "$signature" ]] || ! cmp -s "$signature" "$next_signature"; then
+    rm -f "$main_object" "$main_object.d" "$target" "$mode_dir/runtime.symbols"
+fi
+mv "$next_signature" "$signature"
+
+makefile="$mode_dir/link.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n\n'
+    printf 'OBJECTS :='
+    printf ' %s' "${objects[@]}"
+    printf '\n\n'
+    printf '.PHONY: all\n'
+    printf 'all: %s\n\n' "$target"
+    printf '%s: %s\n' "$main_object" "$main_source"
+    printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n' "$main_object" "$main_source" "$main_object"
+    printf '%s: $(OBJECTS) %s\n' "$target" "$main_object"
+    printf '\t@$(CXX) $(OBJECTS) %s -Wl,--gc-sections -lfmt -o %s\n\n' "$main_object" "$target"
+    printf '\n-include %s.d\n' "$main_object"
+} > "$makefile"
+make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null
+
+printf '%s\n' "$target"

build-linuxcnc-wasm-probe-objects.sh

@@ -0,0 +1,196 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+usage() {
+    echo "usage: $0 --mode source-objects|rs274ngc-pre|runtime [manifest]" >&2
+}
+
+mode=
+manifest=linuxcnc-rs274-wasm-source-files.txt
+while [[ "$#" -gt 0 ]]; do
+    case "$1" in
+        --mode)
+            if [[ "$#" -lt 2 ]]; then
+                echo "missing --mode value" >&2
+                exit 1
+            fi
+            mode=$2
+            shift 2
+            ;;
+        --help|-h)
+            usage
+            exit 0
+            ;;
+        --*)
+            usage
+            echo "unknown wasm probe object cache option: $1" >&2
+            exit 1
+            ;;
+        *)
+            manifest=$1
+            shift
+            ;;
+    esac
+done
+case "$mode" in
+    source-objects|rs274ngc-pre|runtime)
+        ;;
+    "")
+        usage
+        echo "missing --mode" >&2
+        exit 1
+        ;;
+    *)
+        usage
+        echo "unknown wasm probe object cache mode: $mode" >&2
+        exit 1
+        ;;
+esac
+
+linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+cxx=${CXX:-g++}
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+cache_dir=${CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR-build/wasm-probe-object-cache}
+if [[ -z "$cache_dir" ]]; then
+    echo "CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$cache_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR must not contain whitespace: $cache_dir" >&2
+    exit 1
+fi
+mkdir -p "$cache_dir"
+cache_dir=$(cd "$cache_dir" && pwd)
+if [[ "$cache_dir" == "/" ]]; then
+    echo "CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-"$cache_dir/preflight-cache"}
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest" --require-rs274-complete
+manifest=$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
+
+common_flag_profile=core20-sections
+case "$mode" in
+    source-objects)
+        common_flag_profile=core20
+        ;;
+esac
+common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh --profile "$common_flag_profile")
+mapfile -t common_flags <<<"$common_flag_output"
+case "$mode" in
+    runtime)
+        common_flags+=(-DCNC_SIM_ENABLE_LINUXCNC_RS274_BACKEND)
+        ;;
+esac
+
+sources=()
+shim_output=$(./list-linuxcnc-wasm-safe-shims.sh)
+mapfile -t shim_sources <<<"$shim_output"
+sources+=("${shim_sources[@]}")
+case "$mode" in
+    source-objects)
+        ;;
+    rs274ngc-pre)
+        project_source_output=$(./list-linuxcnc-wasm-safe-project-sources.sh)
+        if [[ -n "$project_source_output" ]]; then
+            mapfile -t project_sources <<<"$project_source_output"
+            sources+=("${project_sources[@]}")
+        fi
+        ;;
+    runtime)
+        core_source_output=$(./list-cmake-set-sources.sh cnc_sim_core_sources core/)
+        mapfile -t core_sources <<<"$core_source_output"
+        sources+=("${core_sources[@]}")
+        backend_source_output=$(./list-cmake-set-sources.sh cnc_sim_linuxcnc_rs274_backend_sources core/)
+        mapfile -t backend_sources <<<"$backend_source_output"
+        sources+=("${backend_sources[@]}")
+        ;;
+esac
+source_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core full)
+mapfile -t linuxcnc_sources <<<"$source_output"
+sources+=("${linuxcnc_sources[@]}")
+for source in "${sources[@]}"; do
+    if [[ -z "$source" ]]; then
+        echo "wasm probe object source list contains an empty path" >&2
+        exit 1
+    fi
+done
+
+mode_dir="$cache_dir/$mode"
+mkdir -p "$mode_dir"
+exec 8>"$mode_dir/objects.lock"
+flock 8
+
+objects=()
+object_index=0
+for source in "${sources[@]}"; do
+    objects+=("$mode_dir/source_${object_index}.o")
+    object_index=$((object_index + 1))
+done
+
+signature="$mode_dir/objects.signature"
+next_signature="$mode_dir/objects.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'MANIFEST=%s\n' "$manifest"
+    printf 'MODE=%s\n' "$mode"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'SOURCES:\n'
+    printf '%s\n' "${sources[@]}"
+} > "$next_signature"
+if [[ ! -f "$signature" ]] || ! cmp -s "$signature" "$next_signature"; then
+    rm -f "$mode_dir"/source_*.o "$mode_dir"/source_*.d
+fi
+mv "$next_signature" "$signature"
+
+makefile="$mode_dir/objects.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n\n'
+    printf 'OBJECTS :='
+    printf ' %s' "${objects[@]}"
+    printf '\n\n'
+    printf 'DEP_FILES :=\n'
+    for object in "${objects[@]}"; do
+        printf 'DEP_FILES += %s.d\n' "$object"
+    done
+    printf '\n.PHONY: all\n'
+    printf 'all: $(OBJECTS)\n\n'
+
+    object_index=0
+    for source in "${sources[@]}"; do
+        source_flags=()
+        case "$source" in
+            core/src/linuxcnc_corexykins_adapter.c|core/src/linuxcnc_genserfuncs_adapter.c|core/src/linuxcnc_xyzab_tdr_kins_adapter.c)
+                source_flags+=(-fpermissive)
+                ;;
+        esac
+        printf '%s: %s\n' "${objects[$object_index]}" "$source"
+        printf '\t@$(CXX) $(COMMON_FLAGS)'
+        printf ' %s' "${source_flags[@]}"
+        printf ' -MMD -MP -MF %s.d -c %s -o %s\n\n' "${objects[$object_index]}" "$source" "${objects[$object_index]}"
+        object_index=$((object_index + 1))
+    done
+    printf '\n-include $(DEP_FILES)\n'
+} > "$makefile"
+make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null
+
+printf '%s\n' "${objects[@]}"

build-linuxcnc-wasm-standalone-probe.sh

@@ -0,0 +1,196 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+usage() {
+    echo "usage: $0 --mode tooldata-link|tooldata-common-link|interp-base-link|python-plugin-link|rs274ngc-pre-object" >&2
+}
+
+mode=
+while [[ "$#" -gt 0 ]]; do
+    case "$1" in
+        --mode)
+            if [[ "$#" -lt 2 ]]; then
+                echo "missing --mode value" >&2
+                exit 1
+            fi
+            mode=$2
+            shift 2
+            ;;
+        --help|-h)
+            usage
+            exit 0
+            ;;
+        *)
+            usage
+            echo "unknown wasm standalone probe option: $1" >&2
+            exit 1
+            ;;
+    esac
+done
+case "$mode" in
+    tooldata-link|tooldata-common-link|interp-base-link|python-plugin-link|rs274ngc-pre-object)
+        ;;
+    "")
+        usage
+        echo "missing --mode" >&2
+        exit 1
+        ;;
+    *)
+        usage
+        echo "unknown wasm standalone probe mode: $mode" >&2
+        exit 1
+        ;;
+esac
+
+linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+cxx=${CXX:-g++}
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+cache_dir=${CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR-build/wasm-standalone-probe-cache}
+if [[ -z "$cache_dir" ]]; then
+    echo "CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$cache_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR must not contain whitespace: $cache_dir" >&2
+    exit 1
+fi
+mkdir -p "$cache_dir"
+cache_dir=$(cd "$cache_dir" && pwd)
+if [[ "$cache_dir" == "/" ]]; then
+    echo "CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-"$cache_dir/preflight-cache"}
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
+
+common_flag_args=()
+sources=()
+target_name=
+case "$mode" in
+    tooldata-link|tooldata-common-link)
+        if [[ "$mode" == "tooldata-common-link" ]]; then
+            common_flag_args+=(--tooldata-include)
+        fi
+        tooldata_mmap_backend_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_mmap_backend.cc)
+        tooldata_runtime_stubs_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_runtime_stubs.cc)
+        tooldata_common_source=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-files.sh src/emc/tooldata/tooldata_common.cc)
+        sources+=(
+            "$tooldata_common_source"
+            "$tooldata_mmap_backend_shim"
+            "$tooldata_runtime_stubs_shim"
+        )
+        if [[ "$mode" == "tooldata-link" ]]; then
+            sources+=(core/wasm_shims/tooldata/tooldata_probe_main.cc)
+            target_name=tooldata_probe
+        else
+            sources+=(core/wasm_shims/tooldata/tooldata_common_probe_main.cc)
+            target_name=tooldata_common_probe
+        fi
+        ;;
+    interp-base-link)
+        dlfcn_shim=$(./list-linuxcnc-wasm-safe-shims.sh dlfcn.cc)
+        interp_base_source=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-files.sh src/emc/rs274ngc/interp_base.cc)
+        sources+=(
+            "$dlfcn_shim"
+            "$interp_base_source"
+            core/wasm_shims/interp_base_probe_main.cc
+        )
+        target_name=interp_base_probe
+        ;;
+    python-plugin-link)
+        python_plugin_shim=$(./list-linuxcnc-wasm-safe-shims.sh python_plugin.cc)
+        sources+=(
+            "$python_plugin_shim"
+            core/wasm_shims/pythonplugin/python_plugin_probe_main.cc
+        )
+        target_name=python_plugin_probe
+        ;;
+    rs274ngc-pre-object)
+        rs274ngc_pre_source=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-files.sh src/emc/rs274ngc/rs274ngc_pre.cc)
+        sources+=("$rs274ngc_pre_source")
+        target_name=rs274ngc_pre.o
+        ;;
+esac
+
+common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh "${common_flag_args[@]}")
+mapfile -t common_flags <<<"$common_flag_output"
+
+mode_dir="$cache_dir/$mode"
+mkdir -p "$mode_dir"
+exec 8>"$mode_dir/probe.lock"
+flock 8
+
+objects=()
+object_index=0
+for source in "${sources[@]}"; do
+    objects+=("$mode_dir/source_${object_index}.o")
+    object_index=$((object_index + 1))
+done
+target="$mode_dir/$target_name"
+if [[ "$mode" == "rs274ngc-pre-object" ]]; then
+    target=${objects[0]}
+fi
+
+signature="$mode_dir/probe.signature"
+next_signature="$mode_dir/probe.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'MODE=%s\n' "$mode"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'SOURCES:\n'
+    printf '%s\n' "${sources[@]}"
+} > "$next_signature"
+if [[ ! -f "$signature" ]] || ! cmp -s "$signature" "$next_signature"; then
+    rm -f "$mode_dir"/source_*.o "$mode_dir"/source_*.d "$target"
+fi
+mv "$next_signature" "$signature"
+
+makefile="$mode_dir/probe.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n\n'
+    printf 'OBJECTS :='
+    printf ' %s' "${objects[@]}"
+    printf '\n\n'
+    printf 'DEP_FILES :=\n'
+    for object in "${objects[@]}"; do
+        printf 'DEP_FILES += %s.d\n' "$object"
+    done
+    printf '\n.PHONY: all\n'
+    printf 'all: %s\n\n' "$target"
+
+    object_index=0
+    for source in "${sources[@]}"; do
+        printf '%s: %s\n' "${objects[$object_index]}" "$source"
+        printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n' \
+            "${objects[$object_index]}" "$source" "${objects[$object_index]}"
+        object_index=$((object_index + 1))
+    done
+
+    if [[ "$mode" != "rs274ngc-pre-object" ]]; then
+        printf '%s: $(OBJECTS)\n' "$target"
+        printf '\t@$(CXX) $(OBJECTS) -o %s\n\n' "$target"
+    fi
+    printf '\n-include $(DEP_FILES)\n'
+} > "$makefile"
+make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null
+
+printf '%s\n' "$target"

build-wasm.sh

@@ -10,15 +10,18 @@ if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
     echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
     exit 1
 fi
+cmake_compiler_launcher_mode=none
 cmake_compiler_launcher_args=()
 if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cmake_compiler_launcher_mode=ccache
     cmake_compiler_launcher_args+=(
         -DCMAKE_C_COMPILER_LAUNCHER=ccache
         -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
     )
 fi
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
+preflight_cache_dir=build/wasm-preflight-cache
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest"
 manifest=$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")
 linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 default_manifest="$PWD/linuxcnc-rs274-wasm-source-files.txt"
@@ -37,6 +40,51 @@ count_nonempty_lines() {
     printf '%s\n' "$count"
 }
 
+parallel_probe_labels=()
+parallel_probe_logs=()
+parallel_probe_pids=()
+
+run_parallel_wasm_probe() {
+    local label=$1
+    shift
+    local probe_index=${#parallel_probe_pids[@]}
+    local log_dir=build/wasm-preflight-cache/parallel-probe-logs
+    local log="$log_dir/probe_${probe_index}.log"
+
+    mkdir -p "$log_dir"
+    (
+        CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" "$@"
+    ) >"$log" 2>&1 &
+    parallel_probe_labels+=("$label")
+    parallel_probe_logs+=("$log")
+    parallel_probe_pids+=("$!")
+}
+
+wait_parallel_wasm_probes() {
+    local failed=0
+    local probe_index
+    local status
+
+    for probe_index in "${!parallel_probe_pids[@]}"; do
+        echo "${parallel_probe_labels[$probe_index]}"
+        if wait "${parallel_probe_pids[$probe_index]}"; then
+            cat "${parallel_probe_logs[$probe_index]}"
+        else
+            status=$?
+            cat "${parallel_probe_logs[$probe_index]}" >&2 || true
+            echo "${parallel_probe_labels[$probe_index]} failed with status $status" >&2
+            failed=1
+        fi
+    done
+    parallel_probe_labels=()
+    parallel_probe_logs=()
+    parallel_probe_pids=()
+
+    if [[ "$failed" -ne 0 ]]; then
+        exit 1
+    fi
+}
+
 # This script writes fixed build and public artifact paths, so serialize it.
 if [[ "${CNC_SIM_BUILD_WASM_SKIP_LOCK:-0}" != "1" ]]; then
 exec 9>"${TMPDIR:-/tmp}/cnc_sim_build_wasm.lock"
@@ -45,8 +93,8 @@ fi
 
 manifest_core_count=0
 manifest_blocked_count=0
-manifest_core_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core)
-manifest_blocked_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" blocked)
+manifest_core_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core)
+manifest_blocked_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" blocked)
 manifest_core_count=$(count_nonempty_lines "$manifest_core_output")
 manifest_blocked_count=$(count_nonempty_lines "$manifest_blocked_output")
 
@@ -58,55 +106,39 @@ if [[ "$manifest" == "$default_manifest" ]] && [[ "$manifest_core_count" -ne 25
     echo "unexpected wasm manifest partition: core=$manifest_core_count blocked=$manifest_blocked_count" >&2
     exit 1
 fi
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest" --require-rs274-complete
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest" --require-rs274-complete
 
 echo "LinuxCNC wasm blocker scan"
-./test-linuxcnc-wasm-blockers.sh "$manifest"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-blockers.sh "$manifest"
 
 echo "LinuxCNC wasm-safe source syntax probe"
-./test-linuxcnc-wasm-source-syntax.sh "$manifest"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-source-syntax.sh "$manifest"
 
 echo "LinuxCNC wasm-safe source object probe"
-./test-linuxcnc-wasm-source-objects.sh "$manifest"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-source-objects.sh "$manifest"
 
 echo "LinuxCNC wasm-safe CMake probe target"
-./test-linuxcnc-wasm-cmake-safe-probe.sh "$manifest"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-cmake-safe-probe.sh "$manifest"
 
-echo "LinuxCNC wasm tooldata shim link probe"
-./test-linuxcnc-wasm-tooldata-link.sh
-
-echo "LinuxCNC wasm tooldata_common link probe"
-./test-linuxcnc-wasm-tooldata-common-link.sh
-
-echo "LinuxCNC wasm tooldata_mmap symbol probe"
-./test-linuxcnc-wasm-tooldata-mmap-symbols.sh
-
-echo "LinuxCNC wasm tooldata runtime symbol probe"
-./test-linuxcnc-wasm-tooldata-runtime-symbols.sh
-
-echo "LinuxCNC wasm interp_base link probe"
-./test-linuxcnc-wasm-interp-base-link.sh
-
-echo "LinuxCNC wasm interp_find link probe"
-./test-linuxcnc-wasm-interp-find-link.sh
-
-echo "LinuxCNC wasm python_plugin link probe"
-./test-linuxcnc-wasm-python-plugin-link.sh
-
-echo "LinuxCNC wasm Python C API symbol probe"
-./test-linuxcnc-wasm-python-c-api-symbols.sh
-
-echo "LinuxCNC wasm rs274ngc_pre object probe"
-./test-linuxcnc-wasm-rs274ngc-pre-object.sh
+run_parallel_wasm_probe "LinuxCNC wasm tooldata shim link probe" ./test-linuxcnc-wasm-tooldata-link.sh
+run_parallel_wasm_probe "LinuxCNC wasm tooldata_common link probe" ./test-linuxcnc-wasm-tooldata-common-link.sh
+run_parallel_wasm_probe "LinuxCNC wasm tooldata_mmap symbol probe" ./test-linuxcnc-wasm-tooldata-mmap-symbols.sh
+run_parallel_wasm_probe "LinuxCNC wasm tooldata runtime symbol probe" ./test-linuxcnc-wasm-tooldata-runtime-symbols.sh
+run_parallel_wasm_probe "LinuxCNC wasm interp_base link probe" ./test-linuxcnc-wasm-interp-base-link.sh
+run_parallel_wasm_probe "LinuxCNC wasm interp_find link probe" ./test-linuxcnc-wasm-interp-find-link.sh
+run_parallel_wasm_probe "LinuxCNC wasm python_plugin link probe" ./test-linuxcnc-wasm-python-plugin-link.sh
+run_parallel_wasm_probe "LinuxCNC wasm Python C API symbol probe" ./test-linuxcnc-wasm-python-c-api-symbols.sh
+run_parallel_wasm_probe "LinuxCNC wasm rs274ngc_pre object probe" ./test-linuxcnc-wasm-rs274ngc-pre-object.sh
+wait_parallel_wasm_probes
 
 echo "LinuxCNC wasm rs274ngc_pre link blocker scan"
-./test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh "$manifest"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh "$manifest"
 
 echo "LinuxCNC wasm rs274ngc_pre link probe"
-./test-linuxcnc-wasm-rs274ngc-pre-link.sh "$manifest"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-rs274ngc-pre-link.sh "$manifest"
 
 echo "LinuxCNC wasm runtime link probe"
-./test-linuxcnc-wasm-runtime-link.sh "$manifest"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-runtime-link.sh "$manifest"
 
 missing_tools=()
 for required_tool in cmake emcmake emcc node; do
@@ -120,14 +152,37 @@ if ((${#missing_tools[@]} > 0)); then
     exit 1
 fi
 
+wasm_build_signature=build/wasm/wasm-build.signature
+wasm_build_next_signature=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_build.signature.XXXXXX")
+{
+    printf 'CXX=%s\n' "${CXX:-g++}"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'MANIFEST=%s\n' "$manifest"
+    printf 'MANIFEST_HASH='
+    sha256sum "$manifest"
+    printf 'COMPILER_LAUNCHER=%s\n' "$cmake_compiler_launcher_mode"
+    printf 'CMAKE_LISTS='
+    sha256sum core/CMakeLists.txt
+    printf 'CONFIGURE_RULE_VERSION=1\n'
+} > "$wasm_build_next_signature"
+configure_wasm=1
+if [[ ! -f "$wasm_build_signature" ]] || ! cmp -s "$wasm_build_signature" "$wasm_build_next_signature"; then
+    mkdir -p build/wasm
+elif [[ -f build/wasm/CMakeCache.txt ]]; then
+    configure_wasm=0
+fi
+
+if [[ "$configure_wasm" == "1" ]]; then
 emcmake cmake -S core -B build/wasm \
     -DCMAKE_BUILD_TYPE=Release \
     -DCNC_SIM_LINUXCNC_ROOT="$linuxcnc_root" \
     -DCNC_SIM_LINUXCNC_WASM_SOURCE_MANIFEST="$manifest" \
     -DCNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE=ON \
     "${cmake_compiler_launcher_args[@]}"
-cmake --build build/wasm --target cnc_sim_wasm_runtime_probe --parallel "$build_jobs"
-cmake --build build/wasm --target cnc_sim_wasm --parallel "$build_jobs"
+fi
+mv "$wasm_build_next_signature" "$wasm_build_signature"
+cmake --build build/wasm --target cnc_sim_wasm_runtime_probe cnc_sim_wasm --parallel "$build_jobs"
 mkdir -p web/public
 cp build/wasm/cnc_sim.js web/public/cnc_sim.js
 cp build/wasm/cnc_sim.wasm web/public/cnc_sim.wasm

check-linuxcnc-inputs-cached.sh

@@ -0,0 +1,131 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-}
+check_args=("$@")
+if [[ "${1:-}" == "--cache-dir" ]]; then
+    if [[ "$#" -lt 2 ]]; then
+        echo "missing --cache-dir value" >&2
+        exit 1
+    fi
+    cache_dir=$2
+    shift 2
+    check_args=("$@")
+fi
+
+manifest=${1:-}
+require_complete=${2:-}
+linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+
+if [[ -z "$cache_dir" ]]; then
+    LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "${check_args[@]}"
+    exit 0
+fi
+if [[ "$cache_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_PREFLIGHT_CACHE_DIR must not contain whitespace: $cache_dir" >&2
+    exit 1
+fi
+
+mkdir -p "$cache_dir"
+cache_dir=$(cd "$cache_dir" && pwd)
+if [[ "$cache_dir" == "/" ]]; then
+    echo "CNC_SIM_PREFLIGHT_CACHE_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 8>"$cache_dir/check-linuxcnc-inputs.lock"
+flock 8
+
+if [[ ! -d "$linuxcnc_root" ]]; then
+    LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "${check_args[@]}"
+    exit 0
+fi
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
+
+manifest_key=ROOT_ONLY
+manifest_path=
+if [[ -n "$manifest" && "$manifest" != "--root-only" ]]; then
+    if [[ ! -f "$manifest" ]]; then
+        LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "${check_args[@]}"
+        exit 0
+    fi
+    manifest_path=$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")
+    manifest_key=$(printf '%s' "$manifest_path" | sha256sum | awk '{ print $1 }')
+fi
+
+safe_require=${require_complete:-none}
+safe_require=${safe_require//[^A-Za-z0-9_.-]/_}
+args_key=$(
+    {
+        printf 'ARGS='
+        printf ' %q' "${check_args[@]}"
+        printf '\n'
+    } | sha256sum | awk '{ print $1 }'
+)
+cache_file="$cache_dir/check-linuxcnc-inputs.${manifest_key}.${safe_require}.${args_key}.signature"
+next_signature=$(mktemp "$cache_file.next.XXXXXX")
+
+write_source_stat_signature() {
+    local source_path
+    [[ -z "$manifest_path" ]] && return 0
+    while IFS=: read -r group path note extra; do
+        case "$group" in
+            ""|\#*)
+                continue
+                ;;
+        esac
+        [[ -z "${path:-}" ]] && continue
+        source_path="$linuxcnc_root/$path"
+        if [[ ! -f "$source_path" ]]; then
+            return 1
+        fi
+        stat -c 'SOURCE=%n:%s:%y' "$source_path"
+    done < "$manifest_path"
+}
+
+write_complete_mode_signature() {
+    case "$require_complete" in
+        --require-rs274-complete)
+            find "$linuxcnc_root/src/emc/rs274ngc" -maxdepth 1 -type f \
+                -printf 'RS274=%P:%s:%T@\n' | sort
+            ;;
+        --require-kinematics-complete)
+            for source_dir in \
+                "$linuxcnc_root/src/emc/kinematics" \
+                "$linuxcnc_root/src/libnml/posemath" \
+                "$linuxcnc_root/configs/sim"; do
+                [[ -d "$source_dir" ]] || return 1
+                find "$source_dir" -type f -printf "KIN=$source_dir/%P:%s:%T@\n" | sort
+            done
+            ;;
+    esac
+}
+
+if ! {
+    printf 'CHECK_SCRIPT='
+    sha256sum check-linuxcnc-inputs.sh
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'ARGS='
+    printf ' %q' "${check_args[@]}"
+    printf '\n'
+    if [[ -n "$manifest_path" ]]; then
+        printf 'MANIFEST_PATH=%s\n' "$manifest_path"
+        printf 'MANIFEST='
+        sha256sum "$manifest_path"
+        write_source_stat_signature
+    fi
+    write_complete_mode_signature
+} > "$next_signature"; then
+    rm -f "$next_signature"
+    LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "${check_args[@]}"
+    exit 0
+fi
+
+if [[ -f "$cache_file" ]] && cmp -s "$cache_file" "$next_signature"; then
+    rm -f "$next_signature"
+    exit 0
+fi
+
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "${check_args[@]}"
+mv "$next_signature" "$cache_file"

check-linuxcnc-switchkins-remap-table-cached.sh

@@ -0,0 +1,111 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-}
+check_args=("$@")
+if [[ "${1:-}" == "--cache-dir" ]]; then
+    if [[ "$#" -lt 2 ]]; then
+        echo "missing --cache-dir value" >&2
+        exit 1
+    fi
+    cache_dir=$2
+    shift 2
+    check_args=("$@")
+fi
+
+linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+manifest=${1:-linuxcnc-kinematics-source-files.txt}
+
+if [[ -z "$cache_dir" ]]; then
+    LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-switchkins-remap-table.sh "${check_args[@]}"
+    exit 0
+fi
+if [[ "$cache_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_PREFLIGHT_CACHE_DIR must not contain whitespace: $cache_dir" >&2
+    exit 1
+fi
+
+mkdir -p "$cache_dir"
+cache_dir=$(cd "$cache_dir" && pwd)
+if [[ "$cache_dir" == "/" ]]; then
+    echo "CNC_SIM_PREFLIGHT_CACHE_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 8>"$cache_dir/check-linuxcnc-switchkins-remap-table.lock"
+flock 8
+
+if [[ ! -d "$linuxcnc_root" || ! -f "$manifest" ]]; then
+    LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-switchkins-remap-table.sh "${check_args[@]}"
+    exit 0
+fi
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
+manifest_path=$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")
+manifest_key=$(printf '%s' "$manifest_path" | sha256sum | awk '{ print $1 }')
+args_key=$(
+    {
+        printf 'ARGS='
+        printf ' %q' "${check_args[@]}"
+        printf '\n'
+    } | sha256sum | awk '{ print $1 }'
+)
+cache_file="$cache_dir/check-linuxcnc-switchkins-remap-table.${manifest_key}.${args_key}.signature"
+next_signature=$(mktemp "$cache_file.next.XXXXXX")
+
+write_manifest_source_stats() {
+    local source_path
+    while IFS=: read -r group path note extra; do
+        case "$group" in
+            ""|\#*)
+                continue
+                ;;
+        esac
+        [[ -z "${path:-}" ]] && continue
+        source_path="$linuxcnc_root/$path"
+        if [[ ! -f "$source_path" ]]; then
+            return 1
+        fi
+        stat -c 'SOURCE=%n:%s:%y' "$source_path"
+    done < "$manifest_path"
+}
+
+write_project_output_hashes() {
+    local project_output
+    for project_output in \
+        core/src/linuxcnc_switchkins_remap_table.inc \
+        core/tests/linuxcnc_switchkins_remap_config_cases.inc \
+        web/public/linuxcnc_switchkins_remap_config_cases.json; do
+        [[ -f "$project_output" ]] || return 1
+        sha256sum "$project_output"
+    done
+}
+
+if ! {
+    printf 'CHECK_SCRIPT='
+    sha256sum check-linuxcnc-switchkins-remap-table.sh
+    printf 'GENERATOR_SCRIPT='
+    sha256sum generate-linuxcnc-switchkins-remap-table.sh
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'ARGS='
+    printf ' %q' "${check_args[@]}"
+    printf '\n'
+    printf 'MANIFEST_PATH=%s\n' "$manifest_path"
+    printf 'MANIFEST='
+    sha256sum "$manifest_path"
+    write_manifest_source_stats
+    printf 'PROJECT_OUTPUTS:\n'
+    write_project_output_hashes
+} > "$next_signature"; then
+    rm -f "$next_signature"
+    LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-switchkins-remap-table.sh "${check_args[@]}"
+    exit 0
+fi
+
+if [[ -f "$cache_file" ]] && cmp -s "$cache_file" "$next_signature"; then
+    rm -f "$next_signature"
+    exit 0
+fi
+
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-switchkins-remap-table.sh "${check_args[@]}"
+mv "$next_signature" "$cache_file"

core/CMakeLists.txt

@@ -196,84 +196,6 @@ if(CNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE)
         target_compile_definitions(linuxcnc_rs274_wasm_safe_probe_objects PRIVATE FMT_HEADER_ONLY=1)
     endif()
 
-    set(linuxcnc_rs274_wasm_safe_probe_project_sources
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/canon_event_sink.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_canon_bridge.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_rs274_backend.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_tooldata_fixture.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_5axiskins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_5axiskins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_corexykins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_corexykins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_cubic_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_cubic_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_genserfuncs_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_genserfuncs_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_genhexkins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_genhexkins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_kins_util_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_kins_util_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_lineardeltakins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_lineardeltakins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_maxkins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_maxkins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_pentakins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_pentakins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_pumakins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_pumakins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_rotatekins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_rotatekins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_rosekins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_rosekins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_rotarydeltakins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_rotarydeltakins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_scarakins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_scarakins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_scorbot_kins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_scorbot_kins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_tripodkins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_tripodkins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_trtfuncs_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_trtfuncs_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_userkfuncs_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_userkfuncs_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_xyzab_tdr_kins_adapter.c
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/linuxcnc_xyzab_tdr_kins_adapter.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/rtcp_kinematics.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/src/simulator_gcode_controls.cpp
-    )
-
-    add_executable(linuxcnc_rs274_wasm_safe_probe EXCLUDE_FROM_ALL
-        $<TARGET_OBJECTS:linuxcnc_rs274_wasm_safe_probe_objects>
-        ${linuxcnc_rs274_wasm_safe_probe_project_sources}
-        ${CMAKE_CURRENT_SOURCE_DIR}/wasm_shims/rs274ngc_pre_probe_main.cc
-    )
-    target_compile_features(linuxcnc_rs274_wasm_safe_probe PRIVATE cxx_std_20)
-    target_compile_definitions(linuxcnc_rs274_wasm_safe_probe
-        PRIVATE
-            CNC_SIM_ENABLE_LINUXCNC_RS274_BACKEND
-            CNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE
-            ULAPI
-    )
-    target_compile_options(linuxcnc_rs274_wasm_safe_probe PRIVATE ${cnc_sim_wasm_safe_preinclude_options})
-    target_include_directories(linuxcnc_rs274_wasm_safe_probe
-        PRIVATE
-            ${CMAKE_CURRENT_SOURCE_DIR}/include
-            ${CMAKE_CURRENT_SOURCE_DIR}/src
-            ${CMAKE_CURRENT_SOURCE_DIR}/wasm_shims
-            ${CNC_SIM_LINUXCNC_ROOT_ABS}/src
-            ${CNC_SIM_LINUXCNC_ROOT_ABS}/src/emc
-            ${CNC_SIM_LINUXCNC_ROOT_ABS}/src/emc/nml_intf
-            ${CNC_SIM_LINUXCNC_ROOT_ABS}/src/emc/rs274ngc
-            ${CNC_SIM_LINUXCNC_ROOT_ABS}/src/emc/motion
-            ${CNC_SIM_LINUXCNC_ROOT_ABS}/include
-    )
-    if(EMSCRIPTEN)
-        target_compile_definitions(linuxcnc_rs274_wasm_safe_probe PRIVATE FMT_HEADER_ONLY=1)
-    else()
-        target_link_libraries(linuxcnc_rs274_wasm_safe_probe PRIVATE fmt)
-    endif()
-
     set(cnc_sim_wasm_runtime_probe_main
         ${CMAKE_CURRENT_SOURCE_DIR}/wasm_shims/cnc_sim_wasm_runtime_probe_main.cc
     )
@@ -371,6 +293,37 @@ if(CNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE)
 endif()
 
 if(CNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE)
+    add_executable(linuxcnc_rs274_wasm_safe_probe EXCLUDE_FROM_ALL
+        $<TARGET_OBJECTS:linuxcnc_rs274_wasm_safe_probe_objects>
+        $<TARGET_OBJECTS:cnc_sim_objects>
+        ${CMAKE_CURRENT_SOURCE_DIR}/wasm_shims/rs274ngc_pre_probe_main.cc
+    )
+    target_compile_features(linuxcnc_rs274_wasm_safe_probe PRIVATE cxx_std_20)
+    target_compile_definitions(linuxcnc_rs274_wasm_safe_probe
+        PRIVATE
+            CNC_SIM_ENABLE_LINUXCNC_RS274_BACKEND
+            CNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE
+            ULAPI
+    )
+    target_compile_options(linuxcnc_rs274_wasm_safe_probe PRIVATE ${cnc_sim_wasm_safe_preinclude_options})
+    target_include_directories(linuxcnc_rs274_wasm_safe_probe
+        PRIVATE
+            ${CMAKE_CURRENT_SOURCE_DIR}/include
+            ${CMAKE_CURRENT_SOURCE_DIR}/src
+            ${CMAKE_CURRENT_SOURCE_DIR}/wasm_shims
+            ${CNC_SIM_LINUXCNC_ROOT_ABS}/src
+            ${CNC_SIM_LINUXCNC_ROOT_ABS}/src/emc
+            ${CNC_SIM_LINUXCNC_ROOT_ABS}/src/emc/nml_intf
+            ${CNC_SIM_LINUXCNC_ROOT_ABS}/src/emc/rs274ngc
+            ${CNC_SIM_LINUXCNC_ROOT_ABS}/src/emc/motion
+            ${CNC_SIM_LINUXCNC_ROOT_ABS}/include
+    )
+    if(EMSCRIPTEN)
+        target_compile_definitions(linuxcnc_rs274_wasm_safe_probe PRIVATE FMT_HEADER_ONLY=1)
+    else()
+        target_link_libraries(linuxcnc_rs274_wasm_safe_probe PRIVATE fmt)
+    endif()
+
     add_executable(cnc_sim_wasm_runtime_probe EXCLUDE_FROM_ALL
         $<TARGET_OBJECTS:linuxcnc_rs274_wasm_safe_probe_objects>
         $<TARGET_OBJECTS:cnc_sim_objects>

docs/linuxcnc-source-policy.md

@@ -44,30 +44,170 @@ Required workflow for every functional change:
    and guardrail checks: `./test-all-native.sh`,
    `./test-linuxcnc-source-syntax.sh`, and
    `./test-linuxcnc-wasm-cmake-safe-probe.sh`.
+   When `./test-native.sh` and `./test-linuxcnc-source-link.sh` have already
+   been run in the same pass, use
+   `CNC_SIM_ALL_NATIVE_GUARDRAILS_ONLY=1 ./test-all-native.sh` for the
+   aggregate guardrail pass instead of recompiling the same native/source-link
+   targets again.
+8. Keep `./test-linuxcnc-wasm-cmake-safe-probe.sh` focused on the actual CMake
+   probe by default. Run
+   `CNC_SIM_WASM_CMAKE_SAFE_PROBE_SELF_CHECKS=1 ./test-linuxcnc-wasm-cmake-safe-probe.sh`
+   only when changing its meta-guardrails or the surrounding build-wasm policy.
 
 Efficiency rules:
 
+- Each pass should advance one reasonable, reviewable context. Do not use a
+  nearby failing smoke assertion, broad fixture, or convenient touched file as
+  permission to expand the pass into another workstream.
 - Do not add a smoke-only behavior path when the LinuxCNC-backed route already
   exists; add coverage to the source-backed route instead.
+- Smoke tests are verification guardrails. They must not be expanded with new
+  functional CNC behavior unless that behavior is directly routed to, copied
+  from, or checked against the relevant LinuxCNC source in the same narrow
+  context.
 - Do not mix generator/table work, manifests, OPFS/browser work, and build
   policy cleanup in the same pass unless the files directly depend on each
   other.
 - Prefer tightening an existing probe or manifest over adding another broad
   end-to-end smoke case.
+- Do not run the full native aggregate after already running its expensive
+  native/source-link children in the same pass; use the explicit guardrails-only
+  aggregate mode for build-policy cleanup.
+- Keep meta-guardrails out of hot build paths. The wasm-safe CMake probe may
+  run extended self-checks with `CNC_SIM_WASM_CMAKE_SAFE_PROBE_SELF_CHECKS=1`,
+  and the source syntax probe may run extended self-checks with
+  `CNC_SIM_SOURCE_SYNTAX_SELF_CHECKS=1`. The wasm blocker probe may run
+  analyzer failure-path self-checks with `CNC_SIM_WASM_BLOCKERS_SELF_CHECKS=1`.
+  The default actual CMake, syntax, and blocker probe paths remain fast.
+- Keep `test-linuxcnc-wasm-source-syntax.sh` on the same persistent incremental
+  build pattern as the native syntax probe. It must use
+  `build/wasm-source-syntax-test` by default, dependency files, a signature,
+  `make --output-sync=target`, and `CNC_SIM_BUILD_JOBS:-8`.
+- Reuse source preflight results in persistent build directories through
+  `check-linuxcnc-inputs-cached.sh`; its signature must include the LinuxCNC
+  root, manifest content, source file size and nanosecond mtime stats, the check
+  mode, and the checker script hash. Cache updates must be serialized with a
+  lock inside the cache directory and must write next signatures through unique
+  temporary files.
+  Root-only source, flag, and link helper scripts must also use this cached
+  preflight, defaulting to `build/linuxcnc-helper-preflight-cache` when a caller
+  has not supplied `CNC_SIM_PREFLIGHT_CACHE_DIR`.
+  `build-wasm.sh` must pass its preflight cache into nested build probes such as
+  `test-linuxcnc-wasm-blockers.sh` and
+  `test-linuxcnc-wasm-cmake-safe-probe.sh` instead of forcing a second cache
+  walk in the same pass.
+- Cache wasm blocker analyzer output in `test-linuxcnc-wasm-blockers.sh`. Its
+  signature must include the analyzer script, manifest content, LinuxCNC source
+  size and nanosecond mtime stats, shim lister script, and shim source hashes.
+  The cache must be locked and may be overridden with
+  `CNC_SIM_WASM_BLOCKERS_CACHE_DIR`.
+- Reuse switchkins/remap table check results in the same persistent cache with
+  `check-linuxcnc-switchkins-remap-table-cached.sh`; its signature must include
+  the checker and generator scripts, the kinematics manifest, referenced
+  LinuxCNC source size and nanosecond mtime stats, and tracked generated
+  table/case outputs.
+- Reuse wasm probe objects across the wasm source object probe,
+  `rs274ngc_pre` blocker/link probes, and the runtime link probe through
+  `build-linuxcnc-wasm-probe-objects.sh`. Its mode-specific object caches must
+  be keyed by compiler, LinuxCNC root, manifest, flags, and source list, and
+  must include make dependency files so repeated build-wasm passes and the
+  paired `rs274ngc_pre` probes do not recompile unchanged LinuxCNC core files,
+  shims, or kinematics adapters.
+- Reuse standalone wasm probe objects and binaries for the tooldata link,
+  tooldata_common link, `interp_base` link, python_plugin link, and
+  `rs274ngc_pre` object probes through
+  `build-linuxcnc-wasm-standalone-probe.sh`. Its mode-specific caches must keep
+  compiler, LinuxCNC root, flags, source list, dependency files, and a lock so
+  repeated build-wasm passes do not rebuild unchanged probe inputs.
+- Reuse wasm final link probes for `rs274ngc_pre` and runtime link checks
+  through `build-linuxcnc-wasm-link-probe.sh`. It must consume
+  `build-linuxcnc-wasm-probe-objects.sh`, cache probe main objects and linked
+  executables with dependency files and a lock, and keep runtime symbol checks
+  in `test-linuxcnc-wasm-runtime-link.sh`.
+- Cache the runtime link probe symbol table in `test-linuxcnc-wasm-runtime-link.sh`
+  using the probe binary size and mtime plus an explicit `SYMBOL_RULE_VERSION`,
+  so repeated build-wasm passes do not rerun `nm -C` on an unchanged probe.
+- Cache the `rs274ngc_pre` pre-link undefined-symbol scan in
+  `test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh`. Its signature must
+  include the LinuxCNC root, manifest, object list, object size and mtime stats,
+  and an explicit `FILTER_RULE_VERSION`, with a lock and
+  `CNC_SIM_WASM_RS274NGC_PRE_LINK_BLOCKERS_CACHE_DIR` override.
+- Keep `test-linuxcnc-wasm-python-c-api-symbols.sh` persistent for repeated
+  build-wasm passes. It must use `build/wasm-python-c-api-symbols`,
+  dependency files, a build signature, cached source token and object symbol
+  signatures, `make --output-sync=target`, and `CNC_SIM_BUILD_JOBS:-8` while
+  still deriving required Python C API symbols from LinuxCNC RS274 Python/remap
+  sources.
+- Keep `test-linuxcnc-wasm-interp-find-link.sh` persistent for repeated
+  build-wasm passes. It must use `build/wasm-interp-find-link`, dependency
+  files, a signature, `make --output-sync=target`, and `CNC_SIM_BUILD_JOBS:-8`
+  while still linking LinuxCNC `interp_find.cc` with the wasm-safe tooldata and
+  RTAPI shims.
+- Keep tooldata symbol probes persistent for repeated build-wasm passes.
+  `test-linuxcnc-wasm-tooldata-mmap-symbols.sh` must use
+  `build/wasm-tooldata-mmap-symbols`, and
+  `test-linuxcnc-wasm-tooldata-runtime-symbols.sh` must use
+  `build/wasm-tooldata-runtime-symbols`; both must use dependency files,
+  build signatures, cached `nm --defined-only` symbol export signatures,
+  `make --output-sync=target`, and `CNC_SIM_BUILD_JOBS:-8` while comparing wasm
+  shim exports against LinuxCNC tooldata sources.
 - Default native, source-link, build-wasm, and wasm-safe CMake probe
   parallelism to `CNC_SIM_BUILD_JOBS:-8`; raise it only by explicit
   positive-integer environment override.
-- When `ccache` is available and `CXX` is unset, native and wasm build paths
-  should enable compiler caching automatically rather than requiring a manual
-  wrapper.
-- Persistent native, source-link, and wasm-safe CMake probe build directories
-  may be overridden for local workflows, but must not point at the filesystem
-  root.
+- Persistent object/stamp signatures must not include `CNC_SIM_BUILD_JOBS`.
+  Parallelism affects scheduling only; changing it must not invalidate otherwise
+  unchanged LinuxCNC source, shim, syntax, or CMake probe build outputs.
+- Persistent native, source-object, source-link, source-syntax, RS274 native,
+  bridge native, API native, shared bridge-object, wasm source-syntax,
+  wasm probe-object, wasm link-probe, wasm standalone-probe, wasm Python C API,
+  wasm interp_find, and wasm tooldata symbol signatures must include an explicit
+  `BUILD_RULE_VERSION` instead of hashing the whole probe script. Bump that
+  version when generated compile or link rule semantics change; ordinary
+  guardrail and smoke assertion edits must not invalidate unchanged LinuxCNC
+  source, shim, or project objects.
+- The LinuxCNC canon bridge native smoke probe must use persistent
+  `build/bridge-native-test` objects, dependency files, a build-rule signature,
+  `make --output-sync=target`, and `CNC_SIM_BUILD_JOBS:-8`; it must not compile
+  all bridge sources in a throwaway temporary directory on every aggregate pass.
+  Its 41 LinuxCNC bridge/project objects must be built through the shared
+  `build-linuxcnc-native-bridge-objects.sh` cache so the RS274 API native smoke
+  probe can link the same objects instead of recompiling them.
+- The LinuxCNC RS274 API native smoke probe must use persistent
+  `build/api-native-test` objects, dependency files, a build-rule signature,
+  `make --output-sync=target`, and `CNC_SIM_BUILD_JOBS:-8`; it must keep
+  resetting its RS274 parameter file from LinuxCNC `tests/halui/jogging/sim.var`
+  before running the smoke executable. It must reuse the shared bridge object
+  cache and compile only its extra API/backend sources locally. Its LinuxCNC
+  RS274 backend compile define must be applied only to source files that use
+  that define, currently `core/src/gcode_backend.cpp`, so unrelated bridge and
+  kinematics adapter objects are not rebuilt by backend-specific rule changes.
+- When `ccache` is available and `CXX` is unset, native, source-link,
+  source-syntax, and wasm build paths should enable compiler caching
+  automatically rather than requiring a manual wrapper, including the
+  wasm-safe CMake probe.
+- Persistent native, source-link, source-syntax, and wasm-safe CMake probe
+  build directories, plus the wasm source-syntax, Python C API, and interp_find
+  probe build directories, tooldata symbol probe build directories, and wasm
+  standalone/link probe cache directories may be overridden for local workflows,
+  but must not point at the filesystem root.
 - Build policy knobs are intentionally narrow:
   `CNC_SIM_BUILD_JOBS`, `CNC_SIM_NATIVE_BUILD_DIR`,
-  `CNC_SIM_SOURCE_LINK_BUILD_DIR`, `CNC_SIM_SOURCE_SYNTAX_BUILD_DIR`, and
-  `CNC_SIM_WASM_CMAKE_SAFE_PROBE_BUILD_DIR`. Build directory overrides must
-  stay non-empty, whitespace-free, and outside the filesystem root.
+  `CNC_SIM_SOURCE_LINK_BUILD_DIR`, `CNC_SIM_SOURCE_SYNTAX_BUILD_DIR`,
+  `CNC_SIM_SOURCE_OBJECTS_BUILD_DIR`, `CNC_SIM_BRIDGE_NATIVE_BUILD_DIR`,
+  `CNC_SIM_API_NATIVE_BUILD_DIR`, `CNC_SIM_NATIVE_BRIDGE_OBJECT_CACHE_DIR`, and
+  `CNC_SIM_RS274_NATIVE_BUILD_DIR`, and
+  `CNC_SIM_WASM_CMAKE_SAFE_PROBE_BUILD_DIR`. The wasm source-syntax probe also
+  accepts `CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR` because it owns a persistent
+  incremental cache. The wasm Python C API probe accepts
+  `CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR` for the same reason, and the
+  wasm interp_find probe accepts `CNC_SIM_WASM_INTERP_FIND_BUILD_DIR`.
+  Tooldata symbol probes accept
+  `CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR` and
+  `CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR`.
+  Standalone wasm probes accept `CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR`.
+  Final wasm link probes accept `CNC_SIM_WASM_LINK_PROBE_CACHE_DIR`.
+  Build directory overrides must stay non-empty, whitespace-free, and outside
+  the filesystem root.
 - `build-wasm.sh` keeps fixed artifact paths: CMake writes `build/wasm`, then
   the script copies and byte-compares `cnc_sim.js` and `cnc_sim.wasm` under
   `web/public` before running Node and browser smoke checks.
@@ -82,23 +222,61 @@ Build and source-link guardrails:
 - `test-linuxcnc-source-syntax.sh` uses persistent
   `build/source-syntax-test` stamps, dependency files, and
   `source-syntax.signature`.
+- `test-linuxcnc-source-objects.sh` uses persistent
+  `build/source-objects-test` objects, dependency files, and
+  `source-objects.signature`.
+- `test-linuxcnc-rs274-native.sh` uses persistent
+  `build/rs274-native-test` objects, dependency files, and
+  `rs274-native.signature`.
 - `test-linuxcnc-wasm-cmake-safe-probe.sh` uses persistent
-  `build/wasm-cmake-safe-probe` and `wasm-cmake-safe-probe.signature`.
+  `build/wasm-cmake-safe-probe` and `wasm-cmake-safe-probe.signature`; signature
+  changes must reconfigure in place, its signature must include an explicit
+  `CONFIGURE_RULE_VERSION`, and its two probe executables must be built with one
+  combined `cmake --build` invocation.
+- `test-linuxcnc-wasm-source-syntax.sh` uses persistent
+  `build/wasm-source-syntax-test` stamps, dependency files, and
+  `wasm-source-syntax.signature`.
+- `test-linuxcnc-wasm-python-c-api-symbols.sh` uses persistent
+  `build/wasm-python-c-api-symbols` objects, dependency files, and
+  `python-c-api.signature`.
+- `test-linuxcnc-wasm-interp-find-link.sh` uses persistent
+  `build/wasm-interp-find-link` objects, dependency files, and
+  `interp-find.signature`.
+- `test-linuxcnc-wasm-tooldata-mmap-symbols.sh` uses persistent
+  `build/wasm-tooldata-mmap-symbols` objects, dependency files, and
+  `tooldata-mmap-symbols.signature`.
+- `test-linuxcnc-wasm-tooldata-runtime-symbols.sh` uses persistent
+  `build/wasm-tooldata-runtime-symbols` objects, dependency files, and
+  `tooldata-runtime-symbols.signature`.
 - Native, source-link, source-syntax, wasm-safe CMake probe, and build-wasm
   paths must reject empty, whitespace-containing, or filesystem-root build
   directory overrides before doing destructive cleanup.
 - Native, source-link, source-syntax, and build-wasm entry points must serialize
   shared non-concurrency-safe paths with lock files before writing fixed
   outputs.
-- Source-link and syntax probes must build from generated makefiles with
-  `-MMD -MP` dependency tracking and `make --output-sync=target`.
+- `CNC_SIM_ALL_NATIVE_GUARDRAILS_ONLY=1 ./test-all-native.sh` must run the
+  aggregate guardrail and failure-path assertions without invoking the expensive
+  child native/source-link compile and smoke scripts.
+- Native, source-object, source-link, RS274 native, and syntax probes must build
+  from generated makefiles with `-MMD -MP` dependency tracking and
+  `make --output-sync=target`.
 - `build-wasm.sh` must run blocker, syntax, object, CMake, tooldata,
   `interp_*`, Python, `rs274ngc_pre`, and runtime link probes before copying
   browser artifacts.
+- Independent tooldata, `interp_*`, Python, and `rs274ngc_pre` object probes in
+  `build-wasm.sh` may run in parallel, but their logs must be replayed in a
+  deterministic order and the script must wait for all of them before
+  `rs274ngc_pre` link checks.
 - `build-wasm.sh` must check `cmake`, `emcmake`, `emcc`, and `node` before the
   Emscripten configure step.
+- `build-wasm.sh` must reuse a persistent `build/wasm` configure signature
+  keyed by manifest, `core/CMakeLists.txt`, an explicit
+  `CONFIGURE_RULE_VERSION`, LinuxCNC root, and compiler launcher. The signature
+  must not include `CNC_SIM_BUILD_JOBS`, and signature changes must reconfigure
+  the existing build tree in place instead of deleting compiled objects.
 - `build-wasm.sh` must build `cnc_sim_wasm_runtime_probe` before
-  `cnc_sim_wasm`.
+  `cnc_sim_wasm`, using one combined `cmake --build` invocation for both
+  targets.
 - `build-wasm.sh` must copy `build/wasm/cnc_sim.js` and
   `build/wasm/cnc_sim.wasm` exactly once each.
 - `build-wasm.sh` must compare copied artifacts with `cmp -s` before running

list-linuxcnc-manifest-sources.sh

@@ -23,7 +23,8 @@ checks_duplicate_group() {
     [[ "$groups" == "all" ]] || contains_group "$groups" "$group"
 }
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh "$manifest"
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 
 if [[ "$filter_group" != "all" ]] && ! contains_group "$allowed_groups" "$filter_group"; then
     echo "unknown manifest source filter: $filter_group" >&2
@@ -52,9 +53,11 @@ while IFS=: read -r group path note; do
         exit 1
     fi
 
-    full_path=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-files.sh \
-        --missing-message "$missing_source_message" \
-        "$path")
+    full_path="$linuxcnc_root/$path"
+    if [[ ! -f "$full_path" ]]; then
+        echo "$missing_source_message: $path" >&2
+        exit 1
+    fi
     if checks_duplicate_group "$duplicate_groups" "$group"; then
         if printf '%s\n' "${seen_sources[@]}" | grep -Fx -- "$path" >/dev/null; then
             echo "duplicate manifest source: $path" >&2

list-linuxcnc-native-linkflags.sh

@@ -4,8 +4,9 @@ set -euo pipefail
 cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/linuxcnc-helper-preflight-cache}
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
 
 printf '%s\n' \
     -L "$linuxcnc_root/lib" \

list-linuxcnc-source-common-cxxflags.sh

@@ -4,6 +4,7 @@ set -euo pipefail
 cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/linuxcnc-helper-preflight-cache}
 include_python=0
 include_core_include=0
 include_core_src=0
@@ -43,7 +44,7 @@ while [[ "$#" -gt 0 ]]; do
     esac
 done
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
 
 python_includes=()
 if [[ "$include_python" -eq 1 ]]; then

list-linuxcnc-source-files.sh

@@ -5,8 +5,9 @@ cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 missing_source_message="missing LinuxCNC source"
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/linuxcnc-helper-preflight-cache}
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
 
 while [[ "$#" -gt 0 ]]; do
     case "$1" in

list-linuxcnc-source-support-objects.sh

@@ -5,8 +5,9 @@ cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 filter=${1:-}
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/linuxcnc-helper-preflight-cache}
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
 
 objects=(
     src/objects/emc/rs274ngc/interpmodule.o

list-linuxcnc-wasm-common-cxxflags.sh

@@ -4,6 +4,7 @@ set -euo pipefail
 cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/linuxcnc-helper-preflight-cache}
 std_flag=-std=c++17
 include_core_include=0
 include_core_src=0
@@ -96,7 +97,7 @@ case "$profile" in
         ;;
 esac
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
 
 printf '%s\n' \
     "$std_flag" \

list-linuxcnc-wasm-safe-project-sources.sh

@@ -5,7 +5,10 @@ cd "$(dirname "$0")"
 
 filter=${1:-}
 
-./list-cmake-set-sources.sh linuxcnc_rs274_wasm_safe_probe_project_sources | ./list-filtered-existing-paths.sh \
+{
+    ./list-cmake-set-sources.sh cnc_sim_core_sources core/
+    ./list-cmake-set-sources.sh cnc_sim_linuxcnc_rs274_backend_sources core/
+} | ./list-filtered-existing-paths.sh \
     "$filter" \
     "missing wasm-safe project source" \
     "missing wasm-safe project source in CMake list"

test-all-native.sh

@@ -5,6 +5,11 @@ cd "$(dirname "$0")"
 
 manifest=${1:-linuxcnc-rs274-source-files.txt}
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+guardrails_only=${CNC_SIM_ALL_NATIVE_GUARDRAILS_ONLY:-0}
+if [[ "$guardrails_only" != "0" && "$guardrails_only" != "1" ]]; then
+    echo "CNC_SIM_ALL_NATIVE_GUARDRAILS_ONLY must be 0 or 1: $guardrails_only" >&2
+    exit 1
+fi
 
 missing_root=/tmp/does-not-exist-linuxcnc
 missing_root_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_native_missing_root.XXXXXX.log")
@@ -62,6 +67,54 @@ cleanup_native_test_temps() {
 trap cleanup_native_test_temps EXIT
 
 grep -Fx 'trap cleanup_native_test_temps EXIT' test-all-native.sh >/dev/null
+grep -F 'guardrails_only=${CNC_SIM_ALL_NATIVE_GUARDRAILS_ONLY:-0}' test-all-native.sh >/dev/null
+grep -F 'CNC_SIM_ALL_NATIVE_GUARDRAILS_ONLY must be 0 or 1: $guardrails_only' test-all-native.sh >/dev/null
+grep -F 'all native guardrail checks passed' test-all-native.sh >/dev/null
+test -x check-linuxcnc-inputs-cached.sh
+grep -F 'CNC_SIM_PREFLIGHT_CACHE_DIR' check-linuxcnc-inputs-cached.sh >/dev/null
+grep -F 'sha256sum check-linuxcnc-inputs.sh' check-linuxcnc-inputs-cached.sh >/dev/null
+grep -F 'exec 8>"$cache_dir/check-linuxcnc-inputs.lock"' check-linuxcnc-inputs-cached.sh >/dev/null
+grep -F 'flock 8' check-linuxcnc-inputs-cached.sh >/dev/null
+grep -F 'stat -c '\''SOURCE=%n:%s:%y'\''' check-linuxcnc-inputs-cached.sh >/dev/null
+grep -F 'next_signature=$(mktemp "$cache_file.next.XXXXXX")' check-linuxcnc-inputs-cached.sh >/dev/null
+test -x check-linuxcnc-switchkins-remap-table-cached.sh
+grep -F 'check-linuxcnc-switchkins-remap-table.lock' check-linuxcnc-switchkins-remap-table-cached.sh >/dev/null
+grep -F 'sha256sum check-linuxcnc-switchkins-remap-table.sh' check-linuxcnc-switchkins-remap-table-cached.sh >/dev/null
+grep -F 'sha256sum generate-linuxcnc-switchkins-remap-table.sh' check-linuxcnc-switchkins-remap-table-cached.sh >/dev/null
+grep -F 'stat -c '\''SOURCE=%n:%s:%y'\''' check-linuxcnc-switchkins-remap-table-cached.sh >/dev/null
+grep -F 'core/src/linuxcnc_switchkins_remap_table.inc' check-linuxcnc-switchkins-remap-table-cached.sh >/dev/null
+grep -F 'core/tests/linuxcnc_switchkins_remap_config_cases.inc' check-linuxcnc-switchkins-remap-table-cached.sh >/dev/null
+grep -F 'web/public/linuxcnc_switchkins_remap_config_cases.json' check-linuxcnc-switchkins-remap-table-cached.sh >/dev/null
+grep -F 'check-linuxcnc-switchkins-remap-table-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-kinematics-source-files.txt' test-native.sh >/dev/null
+grep -F 'check-linuxcnc-switchkins-remap-table-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-kinematics-source-files.txt' test-linuxcnc-source-link.sh >/dev/null
+grep -F 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir"' build-wasm.sh >/dev/null
+grep -F 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir"' test-linuxcnc-source-link.sh >/dev/null
+grep -F 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir"' test-linuxcnc-source-syntax.sh >/dev/null
+grep -F 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-cmake-safe-probe.sh "$manifest"' build-wasm.sh >/dev/null
+grep -F 'preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-"$build_dir/preflight-cache"}' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir"' test-native.sh >/dev/null
+for helper_script in \
+    list-linuxcnc-source-files.sh \
+    list-linuxcnc-source-support-objects.sh \
+    list-linuxcnc-source-common-cxxflags.sh \
+    list-linuxcnc-native-linkflags.sh; do
+    grep -F 'preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/linuxcnc-helper-preflight-cache}' "$helper_script" >/dev/null
+    grep -F 'check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only' "$helper_script" >/dev/null
+done
+grep -F 'self_checks=${CNC_SIM_SOURCE_SYNTAX_SELF_CHECKS:-0}' test-linuxcnc-source-syntax.sh >/dev/null
+grep -F 'CNC_SIM_SOURCE_SYNTAX_SELF_CHECKS must be 0 or 1: $self_checks' test-linuxcnc-source-syntax.sh >/dev/null
+grep -F 'CNC_SIM_ALL_NATIVE_GUARDRAILS_ONLY=1 ./test-all-native.sh' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'without invoking the expensive' docs/linuxcnc-source-policy.md >/dev/null
+if ! awk '
+    index($0, "if [[ \"$guardrails_only\" == \"1\" ]]; then") { guardrail_line = NR }
+    index($0, "./test-native.sh") { native_line = NR }
+    index($0, "./test-linuxcnc-source-link.sh \"$manifest\"") { source_link_line = NR }
+    END { exit !(guardrail_line && native_line && source_link_line && guardrail_line < native_line && guardrail_line < source_link_line) }
+' test-all-native.sh; then
+    echo "native aggregate guardrails-only exit must precede expensive child tests" >&2
+    exit 1
+fi
 if ! awk '
     /cleanup_native_test_temps\(\)/ { in_cleanup = 1 }
     in_cleanup && index($0, "\"$missing_manifest\"") { found_missing_manifest = 1 }
@@ -128,20 +181,48 @@ grep -Fx -- "$linuxcnc_root/lib" <<<"$native_link_flags" >/dev/null
 grep -Fx -- "-Wl,-rpath,$linuxcnc_root/lib" <<<"$native_link_flags" >/dev/null
 grep -F 'exec 9>"${TMPDIR:-/tmp}/cnc_sim_linuxcnc_rs274_native.lock"' test-linuxcnc-rs274-native.sh >/dev/null
 grep -F "flock 9" test-linuxcnc-rs274-native.sh >/dev/null
-for build_dir_probe_script in \
-    test-linuxcnc-source-objects.sh \
-    test-linuxcnc-bridge-native.sh \
-    test-linuxcnc-rs274-native.sh \
-    test-linuxcnc-api-native.sh; do
-    if ! awk '
-        index($0, "trap '\''rm -rf \"$build_dir\"'\'' EXIT") { trap_line = NR }
-        index($0, "./check-linuxcnc-inputs.sh") && !check_line { check_line = NR }
-        END { exit !(trap_line && check_line && trap_line < check_line) }
-    ' "$build_dir_probe_script"; then
-        echo "$build_dir_probe_script installs build_dir cleanup after input validation" >&2
-        exit 1
-    fi
-done
+grep -F 'build_dir=${CNC_SIM_BRIDGE_NATIVE_BUILD_DIR-build/bridge-native-test}' test-linuxcnc-bridge-native.sh >/dev/null
+grep -F 'CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not be empty' test-linuxcnc-bridge-native.sh >/dev/null
+grep -F 'CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not contain whitespace: $build_dir' test-linuxcnc-bridge-native.sh >/dev/null
+grep -F 'CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not be the filesystem root' test-linuxcnc-bridge-native.sh >/dev/null
+grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' test-linuxcnc-bridge-native.sh >/dev/null
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-bridge-native.sh >/dev/null
+grep -F 'exec 9>"$build_dir/bridge-native.lock"' test-linuxcnc-bridge-native.sh >/dev/null
+grep -F 'check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only' test-linuxcnc-bridge-native.sh >/dev/null
+test -x build-linuxcnc-native-bridge-objects.sh
+grep -F 'CNC_SIM_NATIVE_BRIDGE_OBJECT_CACHE_DIR' build-linuxcnc-native-bridge-objects.sh >/dev/null
+grep -F 'cache_dir=${CNC_SIM_NATIVE_BRIDGE_OBJECT_CACHE_DIR-build/native-bridge-object-cache}' build-linuxcnc-native-bridge-objects.sh >/dev/null
+grep -F 'native-bridge-objects.signature' build-linuxcnc-native-bridge-objects.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" build-linuxcnc-native-bridge-objects.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null' build-linuxcnc-native-bridge-objects.sh >/dev/null
+grep -F 'build-linuxcnc-native-bridge-objects.sh' test-linuxcnc-bridge-native.sh >/dev/null
+grep -F 'BRIDGE_OBJECTS :=' test-linuxcnc-bridge-native.sh >/dev/null
+if grep -F 'for source in "${project_sources[@]}"' test-linuxcnc-bridge-native.sh >/dev/null; then
+    echo "bridge native smoke still compiles shared project sources locally" >&2
+    exit 1
+fi
+grep -F 'bridge_signature="$build_dir/bridge-native.signature"' test-linuxcnc-bridge-native.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-linuxcnc-bridge-native.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$bridge_makefile"' test-linuxcnc-bridge-native.sh >/dev/null
+grep -F -- '-MMD -MP -MF %s.d' test-linuxcnc-bridge-native.sh >/dev/null
+grep -F 'build_dir=${CNC_SIM_API_NATIVE_BUILD_DIR-build/api-native-test}' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'CNC_SIM_API_NATIVE_BUILD_DIR must not be empty' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'CNC_SIM_API_NATIVE_BUILD_DIR must not contain whitespace: $build_dir' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'CNC_SIM_API_NATIVE_BUILD_DIR must not be the filesystem root' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'exec 9>"$build_dir/api-native.lock"' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'build-linuxcnc-native-bridge-objects.sh' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'api_extra_sources=()' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'is_bridge_source "$source"' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'BRIDGE_OBJECTS :=' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'api_signature="$build_dir/api-native.signature"' test-linuxcnc-api-native.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-linuxcnc-api-native.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$api_makefile"' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'core/src/gcode_backend.cpp)' test-linuxcnc-api-native.sh >/dev/null
+grep -F 'source_flags+=(-DCNC_SIM_ENABLE_LINUXCNC_RS274_BACKEND)' test-linuxcnc-api-native.sh >/dev/null
+grep -F "printf ' %s' \"\${source_flags[@]}\"" test-linuxcnc-api-native.sh >/dev/null
 if ! awk '
     /cleanup_wasm_cmake_probe_temps\(\)/ { in_cleanup = 1 }
     in_cleanup && index($0, "\"$build_dir\"") { found_build_dir = 1 }
@@ -156,14 +237,29 @@ grep -F 'CNC_SIM_SOURCE_LINK_BUILD_DIR must not be empty' test-linuxcnc-source-l
 grep -F 'CNC_SIM_SOURCE_LINK_BUILD_DIR must not contain whitespace: $build_dir' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'CNC_SIM_SOURCE_LINK_BUILD_DIR must not be the filesystem root' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-source-link.sh >/dev/null
+if ! awk '
+    index($0, "check-linuxcnc-inputs-cached.sh --cache-dir") &&
+        index($0, "\"$manifest\"") &&
+        !index($0, "--require-rs274-complete") { check_line = NR }
+    index($0, "./check-linuxcnc-switchkins-remap-table-cached.sh --cache-dir \"$preflight_cache_dir\" linuxcnc-kinematics-source-files.txt") { table_line = NR }
+    END { exit !(check_line && table_line && check_line < table_line) }
+' test-linuxcnc-source-link.sh; then
+    echo "source-link probe must validate its requested manifest before switchkins table checks" >&2
+    exit 1
+fi
 grep -F 'exec 9>"${TMPDIR:-/tmp}/cnc_sim_rs274_source_link.lock"' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'source_link_signature="$build_dir/source-link-build.signature"' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'if [[ ! -f "$source_link_signature" ]] || ! cmp -s "$source_link_signature" "$source_link_next_signature"; then' test-linuxcnc-source-link.sh >/dev/null
+grep -F 'mv "$source_link_next_signature" "$source_link_signature"' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'printf '\''PWD=%s\n'\'' "$PWD"' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'printf '\''LINUXCNC_ROOT=%s\n'\'' "$(cd "$linuxcnc_root" && pwd)"' test-linuxcnc-source-link.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-linuxcnc-source-link.sh >/dev/null
 grep -F 'printf '\''%s: %s\n'\'' "$build_dir/linuxcnc_${linuxcnc_index}.o" "$source"' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'printf '\''%s: %s\n'\'' "$build_dir/project_${project_index}.o" "$source"' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'printf '\''\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n'\''' test-linuxcnc-source-link.sh >/dev/null
+grep -F 'source_link_makefile="$build_dir/source-link.mk"' test-linuxcnc-source-link.sh >/dev/null
+grep -F 'printf '\''\n-include $(DEP_FILES)\n'\''' test-linuxcnc-source-link.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$source_link_makefile"' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'build_dir=${CNC_SIM_NATIVE_BUILD_DIR-build/native-test}' test-native.sh >/dev/null
 grep -F 'CNC_SIM_NATIVE_BUILD_DIR must not be empty' test-native.sh >/dev/null
 grep -F 'CNC_SIM_NATIVE_BUILD_DIR must not contain whitespace: $build_dir' test-native.sh >/dev/null
@@ -172,9 +268,14 @@ grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-native
 grep -F 'exec 9>"$build_dir/native-test.lock"' test-native.sh >/dev/null
 grep -F 'native_signature="$build_dir/native-build.signature"' test-native.sh >/dev/null
 grep -F 'if [[ ! -f "$native_signature" ]] || ! cmp -s "$native_signature" "$native_next_signature"; then' test-native.sh >/dev/null
+grep -F 'mv "$native_next_signature" "$native_signature"' test-native.sh >/dev/null
 grep -F 'printf '\''PWD=%s\n'\'' "$PWD"' test-native.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-native.sh >/dev/null
 grep -F 'printf '\''%s: %s\n'\'' "${core_objects[$core_index]}" "$source"' test-native.sh >/dev/null
 grep -F 'printf '\''\t@$(CXX) $(SMOKE_CXXFLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n'\''' test-native.sh >/dev/null
+grep -F 'native_makefile="$build_dir/native.mk"' test-native.sh >/dev/null
+grep -F 'printf '\''\n-include $(DEP_FILES)\n'\''' test-native.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$native_makefile"' test-native.sh >/dev/null
 grep -F 'build_dir=${CNC_SIM_SOURCE_SYNTAX_BUILD_DIR-build/source-syntax-test}' test-linuxcnc-source-syntax.sh >/dev/null
 grep -F 'CNC_SIM_SOURCE_SYNTAX_BUILD_DIR must not be empty' test-linuxcnc-source-syntax.sh >/dev/null
 grep -F 'CNC_SIM_SOURCE_SYNTAX_BUILD_DIR must not contain whitespace: $build_dir' test-linuxcnc-source-syntax.sh >/dev/null
@@ -184,24 +285,166 @@ grep -F 'exec 9>"$build_dir/source-syntax.lock"' test-linuxcnc-source-syntax.sh
 grep -F 'source_list="$build_dir/linuxcnc_source_syntax_sources.txt"' test-linuxcnc-source-syntax.sh >/dev/null
 grep -F 'source_syntax_signature="$build_dir/source-syntax.signature"' test-linuxcnc-source-syntax.sh >/dev/null
 grep -F 'if [[ ! -f "$source_syntax_signature" ]] || ! cmp -s "$source_syntax_signature" "$source_syntax_next_signature"; then' test-linuxcnc-source-syntax.sh >/dev/null
+grep -F 'mv "$source_syntax_next_signature" "$source_syntax_signature"' test-linuxcnc-source-syntax.sh >/dev/null
 grep -F 'printf '\''LINUXCNC_ROOT=%s\n'\'' "$(cd "$linuxcnc_root" && pwd)"' test-linuxcnc-source-syntax.sh >/dev/null
 grep -F 'printf '\''MANIFEST=%s\n'\'' "$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")"' test-linuxcnc-source-syntax.sh >/dev/null
-grep -F 'printf '\''BUILD_JOBS=%s\n'\'' "$build_jobs"' test-linuxcnc-source-syntax.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-linuxcnc-source-syntax.sh >/dev/null
+if grep -F 'printf '\''BUILD_JOBS=%s\n'\'' "$build_jobs"' test-linuxcnc-source-syntax.sh >/dev/null; then
+    echo "source syntax signature must not depend on CNC_SIM_BUILD_JOBS" >&2
+    exit 1
+fi
 grep -F 'printf '\''%s/source_%s.stamp: %s\n'\'' "$build_dir" "$source_index" "$source"' test-linuxcnc-source-syntax.sh >/dev/null
 grep -F 'printf '\''\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s/source_%s.d %s\n'\''' test-linuxcnc-source-syntax.sh >/dev/null
 grep -F 'make --output-sync=target -j"$build_jobs" -f "$source_syntax_makefile"' test-linuxcnc-source-syntax.sh >/dev/null
+grep -F 'build_dir=${CNC_SIM_SOURCE_OBJECTS_BUILD_DIR-build/source-objects-test}' test-linuxcnc-source-objects.sh >/dev/null
+grep -F 'CNC_SIM_SOURCE_OBJECTS_BUILD_DIR must not be empty' test-linuxcnc-source-objects.sh >/dev/null
+grep -F 'CNC_SIM_SOURCE_OBJECTS_BUILD_DIR must not contain whitespace: $build_dir' test-linuxcnc-source-objects.sh >/dev/null
+grep -F 'CNC_SIM_SOURCE_OBJECTS_BUILD_DIR must not be the filesystem root' test-linuxcnc-source-objects.sh >/dev/null
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-source-objects.sh >/dev/null
+grep -F 'exec 9>"$build_dir/source-objects.lock"' test-linuxcnc-source-objects.sh >/dev/null
+grep -F 'source_objects_signature="$build_dir/source-objects.signature"' test-linuxcnc-source-objects.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-linuxcnc-source-objects.sh >/dev/null
+grep -F 'source_objects_makefile="$build_dir/source-objects.mk"' test-linuxcnc-source-objects.sh >/dev/null
+grep -F 'printf '\''\n-include $(DEP_FILES)\n'\''' test-linuxcnc-source-objects.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$source_objects_makefile"' test-linuxcnc-source-objects.sh >/dev/null
+grep -F 'build_dir=${CNC_SIM_RS274_NATIVE_BUILD_DIR-build/rs274-native-test}' test-linuxcnc-rs274-native.sh >/dev/null
+grep -F 'CNC_SIM_RS274_NATIVE_BUILD_DIR must not be empty' test-linuxcnc-rs274-native.sh >/dev/null
+grep -F 'CNC_SIM_RS274_NATIVE_BUILD_DIR must not contain whitespace: $build_dir' test-linuxcnc-rs274-native.sh >/dev/null
+grep -F 'CNC_SIM_RS274_NATIVE_BUILD_DIR must not be the filesystem root' test-linuxcnc-rs274-native.sh >/dev/null
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-rs274-native.sh >/dev/null
+grep -F 'rs274_native_signature="$build_dir/rs274-native.signature"' test-linuxcnc-rs274-native.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-linuxcnc-rs274-native.sh >/dev/null
+grep -F 'rs274_native_makefile="$build_dir/rs274-native.mk"' test-linuxcnc-rs274-native.sh >/dev/null
+grep -F 'printf '\''\n-include $(DEP_FILES)\n'\''' test-linuxcnc-rs274-native.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$rs274_native_makefile"' test-linuxcnc-rs274-native.sh >/dev/null
+for hot_signature_script in \
+    build-linuxcnc-native-bridge-objects.sh \
+    test-linuxcnc-api-native.sh \
+    test-linuxcnc-bridge-native.sh \
+    test-linuxcnc-rs274-native.sh \
+    test-linuxcnc-source-link.sh \
+    test-linuxcnc-source-objects.sh \
+    test-linuxcnc-source-syntax.sh \
+    test-native.sh; do
+    if grep -F "sha256sum $hot_signature_script" "$hot_signature_script" >/dev/null; then
+        echo "$hot_signature_script hot object signature must use BUILD_RULE_VERSION instead of the whole script hash" >&2
+        exit 1
+    fi
+done
 grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' build-wasm.sh >/dev/null
 grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' build-wasm.sh >/dev/null
+grep -F 'cmake_compiler_launcher_mode=none' build-wasm.sh >/dev/null
+grep -F 'cmake_compiler_launcher_args=()' build-wasm.sh >/dev/null
+grep -F 'cmake_compiler_launcher_mode=ccache' build-wasm.sh >/dev/null
+grep -F '"${cmake_compiler_launcher_args[@]}"' build-wasm.sh >/dev/null
 grep -F 'command -v ccache >/dev/null 2>&1' build-wasm.sh >/dev/null
 grep -F 'CMAKE_C_COMPILER_LAUNCHER=ccache' build-wasm.sh >/dev/null
 grep -F 'CMAKE_CXX_COMPILER_LAUNCHER=ccache' build-wasm.sh >/dev/null
-grep -F 'cmake --build build/wasm --target cnc_sim_wasm_runtime_probe --parallel "$build_jobs"' build-wasm.sh >/dev/null
-grep -F 'cmake --build build/wasm --target cnc_sim_wasm --parallel "$build_jobs"' build-wasm.sh >/dev/null
+grep -F 'wasm_build_signature=build/wasm/wasm-build.signature' build-wasm.sh >/dev/null
+grep -F 'wasm_build_next_signature=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_build.signature.XXXXXX")' build-wasm.sh >/dev/null
+grep -F 'sha256sum "$manifest"' build-wasm.sh >/dev/null
+grep -F 'sha256sum core/CMakeLists.txt' build-wasm.sh >/dev/null
+grep -F "printf 'CONFIGURE_RULE_VERSION=1\n'" build-wasm.sh >/dev/null
+grep -F 'run_parallel_wasm_probe() {' build-wasm.sh >/dev/null
+grep -F 'wait_parallel_wasm_probes() {' build-wasm.sh >/dev/null
+grep -F 'parallel_probe_pids+=("$!")' build-wasm.sh >/dev/null
+grep -F 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" "$@"' build-wasm.sh >/dev/null
+grep -F 'run_parallel_wasm_probe "LinuxCNC wasm tooldata shim link probe" ./test-linuxcnc-wasm-tooldata-link.sh' build-wasm.sh >/dev/null
+grep -F 'run_parallel_wasm_probe "LinuxCNC wasm rs274ngc_pre object probe" ./test-linuxcnc-wasm-rs274ngc-pre-object.sh' build-wasm.sh >/dev/null
+grep -F 'wait_parallel_wasm_probes' build-wasm.sh >/dev/null
+grep -F 'configure_wasm=1' build-wasm.sh >/dev/null
+grep -F 'elif [[ -f build/wasm/CMakeCache.txt ]]; then' build-wasm.sh >/dev/null
+grep -F 'configure_wasm=0' build-wasm.sh >/dev/null
+if grep -F 'rm -rf build/wasm' build-wasm.sh >/dev/null; then
+    echo "build-wasm configure signature changes must reconfigure build/wasm in place" >&2
+    exit 1
+fi
+if grep -F 'printf '\''BUILD_JOBS=%s\n'\'' "$build_jobs"' build-wasm.sh >/dev/null; then
+    echo "build-wasm configure signature must not depend on CNC_SIM_BUILD_JOBS" >&2
+    exit 1
+fi
+grep -F -- 'for required_tool in cmake emcmake emcc node; do' build-wasm.sh >/dev/null
+grep -F -- 'missing_tools+=("$required_tool")' build-wasm.sh >/dev/null
+grep -F 'WASM build tools are required. Missing:' build-wasm.sh >/dev/null
+grep -F -- 'emcmake cmake -S core -B build/wasm \' build-wasm.sh >/dev/null
+grep -F 'cmake --build build/wasm --target cnc_sim_wasm_runtime_probe cnc_sim_wasm --parallel "$build_jobs"' build-wasm.sh >/dev/null
+if ! awk '
+    index($0, "run_parallel_wasm_probe \"LinuxCNC wasm tooldata shim link probe\"") { parallel_start_line = NR }
+    index($0, "wait_parallel_wasm_probes") && parallel_start_line { wait_line = NR }
+    index($0, "LinuxCNC wasm rs274ngc_pre link blocker scan") { pre_link_line = NR }
+    END { exit !(parallel_start_line && wait_line && pre_link_line && parallel_start_line < wait_line && wait_line < pre_link_line) }
+' build-wasm.sh; then
+    echo "build-wasm must wait for independent wasm probes before rs274ngc_pre link checks" >&2
+    exit 1
+fi
+if ! awk '
+    index($0, "cmake --build build/wasm --target cnc_sim_wasm_runtime_probe cnc_sim_wasm --parallel \"$build_jobs\"") {
+        runtime_pos = index($0, "cnc_sim_wasm_runtime_probe")
+        wasm_pos = index($0, " cnc_sim_wasm ")
+    }
+    END { exit !(runtime_pos && wasm_pos && runtime_pos < wasm_pos) }
+' build-wasm.sh; then
+    echo "build-wasm combined CMake build must list runtime probe before browser WASM target" >&2
+    exit 1
+fi
+grep -F 'mkdir -p web/public' build-wasm.sh >/dev/null
+grep -F 'cp build/wasm/cnc_sim.js web/public/cnc_sim.js' build-wasm.sh >/dev/null
+grep -F 'cp build/wasm/cnc_sim.wasm web/public/cnc_sim.wasm' build-wasm.sh >/dev/null
+grep -F 'cmp -s build/wasm/cnc_sim.js web/public/cnc_sim.js' build-wasm.sh >/dev/null
+grep -F 'cmp -s build/wasm/cnc_sim.wasm web/public/cnc_sim.wasm' build-wasm.sh >/dev/null
+if [[ "$(grep -Fc 'cp build/wasm/cnc_sim.js' build-wasm.sh)" -ne 1 ]]; then
+    echo "build-wasm should copy cnc_sim.js exactly once" >&2
+    exit 1
+fi
+if [[ "$(grep -Fc 'cp build/wasm/cnc_sim.wasm' build-wasm.sh)" -ne 1 ]]; then
+    echo "build-wasm should copy cnc_sim.wasm exactly once" >&2
+    exit 1
+fi
+if ! awk '
+    index($0, "mkdir -p web/public") { mkdir_line = NR }
+    index($0, "cp build/wasm/cnc_sim.js web/public/cnc_sim.js") { cp_line = NR }
+    END { exit !(mkdir_line && cp_line && mkdir_line < cp_line) }
+' build-wasm.sh; then
+    echo "build-wasm must create web/public before copying wasm artifacts" >&2
+    exit 1
+fi
+if ! awk '
+    index($0, "for required_tool in cmake emcmake emcc node; do") { tools_line = NR }
+    index($0, "emcmake cmake -S core -B build/wasm") { emcmake_line = NR }
+    END { exit !(tools_line && emcmake_line && tools_line < emcmake_line) }
+' build-wasm.sh; then
+    echo "build-wasm must check required WASM tools before configuring with emcmake" >&2
+    exit 1
+fi
+if ! awk '
+    index($0, "cp build/wasm/cnc_sim.js web/public/cnc_sim.js") { cp_js_line = NR }
+    index($0, "cp build/wasm/cnc_sim.wasm web/public/cnc_sim.wasm") { cp_wasm_line = NR }
+    index($0, "cmp -s build/wasm/cnc_sim.js web/public/cnc_sim.js") { cmp_js_line = NR }
+    index($0, "cmp -s build/wasm/cnc_sim.wasm web/public/cnc_sim.wasm") { cmp_wasm_line = NR }
+    index($0, "node test-web-wasm-node-smoke.cjs") { node_line = NR }
+    index($0, "./test-web-wasm-browser-smoke.sh") { browser_line = NR }
+    END {
+        exit !(cp_js_line && cp_wasm_line && cmp_js_line && cmp_wasm_line && node_line && browser_line &&
+                cp_js_line < cmp_js_line && cp_wasm_line < cmp_wasm_line &&
+                cmp_js_line < node_line && cmp_wasm_line < node_line &&
+                node_line < browser_line)
+    }
+' build-wasm.sh; then
+    echo "build-wasm must verify copied wasm artifacts before running the Node and browser smokes" >&2
+    exit 1
+fi
 grep -F 'command -v ccache >/dev/null 2>&1' test-native.sh >/dev/null
 grep -F 'command -v ccache >/dev/null 2>&1' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'command -v ccache >/dev/null 2>&1' test-linuxcnc-source-syntax.sh >/dev/null
 grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'cmake_compiler_launcher_args=()' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F '"${cmake_compiler_launcher_args[@]}"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'CMAKE_C_COMPILER_LAUNCHER=ccache' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'CMAKE_CXX_COMPILER_LAUNCHER=ccache' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'self_checks=${CNC_SIM_WASM_CMAKE_SAFE_PROBE_SELF_CHECKS:-0}' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'CNC_SIM_WASM_CMAKE_SAFE_PROBE_SELF_CHECKS must be 0 or 1: $self_checks' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'CNC_SIM_WASM_BLOCKERS_SELF_CHECKS must be 0 or 1: $self_checks' test-linuxcnc-wasm-blockers.sh >/dev/null
 grep -F 'cmake_compiler_launcher_mode=none' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'cmake_compiler_launcher_mode=ccache' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'COMPILER_LAUNCHER=%s\n' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
@@ -212,17 +455,43 @@ grep -F 'CNC_SIM_WASM_CMAKE_SAFE_PROBE_BUILD_DIR must not be the filesystem root
 grep -F 'build_signature="$build_dir/wasm-cmake-safe-probe.signature"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'build_next_signature=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_cmake_safe_probe.signature.XXXXXX")' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'if [[ ! -f "$build_signature" ]] || ! cmp -s "$build_signature" "$build_next_signature"; then' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'mv "$build_next_signature" "$build_signature"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'printf '\''LINUXCNC_ROOT=%s\n'\'' "$linuxcnc_root"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'printf '\''MANIFEST=%s\n'\'' "$manifest"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
-grep -F 'printf '\''BUILD_JOBS=%s\n'\'' "$build_jobs"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
-grep -F 'cmake --build "$build_dir" --target linuxcnc_rs274_wasm_safe_probe_objects --parallel "$build_jobs"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
-grep -F 'cmake --build "$build_dir" --target linuxcnc_rs274_wasm_safe_probe --parallel "$build_jobs"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
-grep -F 'cmake --build "$build_dir" --target cnc_sim_wasm_runtime_probe --parallel "$build_jobs"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'sha256sum "$manifest"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F "printf 'CONFIGURE_RULE_VERSION=1\n'" test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+if grep -F 'printf '\''BUILD_JOBS=%s\n'\'' "$build_jobs"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null; then
+    echo "wasm CMake probe signature must not depend on CNC_SIM_BUILD_JOBS" >&2
+    exit 1
+fi
+if awk '
+    BEGIN { forbidden = "rm -rf " "\"$build_dir\"" }
+    $0 ~ "^[[:space:]]*" forbidden { found = 1 }
+    END { exit !found }
+' test-linuxcnc-wasm-cmake-safe-probe.sh; then
+    echo "wasm CMake probe signature changes must reconfigure build_dir in place" >&2
+    exit 1
+fi
+grep -F 'cmake --build "$build_dir" --target linuxcnc_rs274_wasm_safe_probe cnc_sim_wasm_runtime_probe --parallel "$build_jobs"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'CNC_SIM_NATIVE_BUILD_DIR' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'CNC_SIM_SOURCE_LINK_BUILD_DIR' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'CNC_SIM_SOURCE_SYNTAX_BUILD_DIR' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'CNC_SIM_SOURCE_OBJECTS_BUILD_DIR' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'CNC_SIM_RS274_NATIVE_BUILD_DIR' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'CNC_SIM_WASM_CMAKE_SAFE_PROBE_BUILD_DIR' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'Build directory overrides must' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'source-syntax, and wasm build paths should enable compiler caching' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'manual wrapper, including the' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'Persistent object/stamp signatures must not include `CNC_SIM_BUILD_JOBS`.' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'signatures must include an explicit' docs/linuxcnc-source-policy.md >/dev/null
+grep -F '`BUILD_RULE_VERSION` instead of hashing the whole probe script' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'keyed by manifest, `core/CMakeLists.txt`, an explicit' docs/linuxcnc-source-policy.md >/dev/null
+grep -F '`CONFIGURE_RULE_VERSION`, LinuxCNC root, and compiler launcher' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'Reuse standalone wasm probe objects and binaries for the tooldata link,' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'Reuse wasm final link probes for `rs274ngc_pre` and runtime link checks' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'cached `nm --defined-only` symbol export signatures' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'Cache wasm blocker analyzer output' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'Persistent native, source-link, source-syntax, and wasm-safe CMake probe' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'copies and byte-compares `cnc_sim.js` and `cnc_sim.wasm` under' docs/linuxcnc-source-policy.md >/dev/null
 grep -F '`CNC_SIM_BUILD_JOBS` must be a positive integer and defaults to `8`.' docs/linuxcnc-source-policy.md >/dev/null
 grep -F '`test-native.sh` uses persistent `build/native-test` objects' docs/linuxcnc-source-policy.md >/dev/null
@@ -232,7 +501,8 @@ grep -F '`test-linuxcnc-wasm-cmake-safe-probe.sh` uses persistent' docs/linuxcnc
 grep -F 'must reject empty, whitespace-containing, or filesystem-root build' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'entry points must serialize' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'shared non-concurrency-safe paths with lock files' docs/linuxcnc-source-policy.md >/dev/null
-grep -F '`-MMD -MP` dependency tracking and `make --output-sync=target`' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'Native, source-object, source-link, RS274 native, and syntax probes must build' docs/linuxcnc-source-policy.md >/dev/null
+grep -F '`-MMD -MP` dependency tracking and' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'must run blocker, syntax, object, CMake, tooldata,' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'must check `cmake`, `emcmake`, `emcc`, and `node`' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'must build `cnc_sim_wasm_runtime_probe` before' docs/linuxcnc-source-policy.md >/dev/null
@@ -246,12 +516,23 @@ grep -F 'must include the built LinuxCNC `lib` path and rpath' docs/linuxcnc-sou
 grep -F 'must surface helper failures instead of hiding them' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'Temporary probe reports must be cleaned on failure' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'Documentation-only build policy edits should still update the guardrail' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'CNC_SIM_WASM_CMAKE_SAFE_PROBE_SELF_CHECKS=1' docs/linuxcnc-source-policy.md >/dev/null
+grep -F 'default actual CMake, syntax, and blocker probe paths remain fast' docs/linuxcnc-source-policy.md >/dev/null
 grep -F 'python_include_output=$(python3.13-config --includes 2>/dev/null || python3-config --includes)' list-linuxcnc-source-common-cxxflags.sh >/dev/null
 if grep -F 'read -r -a python_includes <<<"$(' list-linuxcnc-source-common-cxxflags.sh >/dev/null; then
     echo "source common cxxflags still hides python-config failures behind read" >&2
     exit 1
 fi
-for script in test-native.sh test-linuxcnc-source-syntax.sh test-linuxcnc-source-link.sh build-wasm.sh; do
+
+for script in \
+    test-native.sh \
+    test-linuxcnc-source-syntax.sh \
+    test-linuxcnc-source-objects.sh \
+    test-linuxcnc-source-link.sh \
+    test-linuxcnc-rs274-native.sh \
+    test-linuxcnc-bridge-native.sh \
+    test-linuxcnc-api-native.sh \
+    build-wasm.sh; do
     if CNC_SIM_BUILD_JOBS=0 "./$script" >"$invalid_build_jobs_log" 2>&1; then
         echo "$script accepted invalid CNC_SIM_BUILD_JOBS" >&2
         exit 1
@@ -334,6 +615,78 @@ if ! grep -F "CNC_SIM_NATIVE_BUILD_DIR must not contain whitespace: build/native
     sed -n '1,20p' "$whitespace_build_dir_log" >&2
     exit 1
 fi
+if CNC_SIM_BRIDGE_NATIVE_BUILD_DIR=/ ./test-linuxcnc-bridge-native.sh >"$invalid_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-bridge-native.sh accepted filesystem root as build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not be the filesystem root" "$invalid_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-bridge-native.sh did not report filesystem-root build dir clearly" >&2
+    sed -n '1,20p' "$invalid_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_BRIDGE_NATIVE_BUILD_DIR=/tmp/.. ./test-linuxcnc-bridge-native.sh >"$invalid_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-bridge-native.sh accepted canonical filesystem root as build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not be the filesystem root" "$invalid_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-bridge-native.sh did not report canonical filesystem-root build dir clearly" >&2
+    sed -n '1,20p' "$invalid_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_BRIDGE_NATIVE_BUILD_DIR= ./test-linuxcnc-bridge-native.sh >"$empty_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-bridge-native.sh accepted empty build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not be empty" "$empty_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-bridge-native.sh did not report empty build dir clearly" >&2
+    sed -n '1,20p' "$empty_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_BRIDGE_NATIVE_BUILD_DIR="build/bridge native test" ./test-linuxcnc-bridge-native.sh >"$whitespace_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-bridge-native.sh accepted whitespace in build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not contain whitespace: build/bridge native test" "$whitespace_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-bridge-native.sh did not report whitespace build dir clearly" >&2
+    sed -n '1,20p' "$whitespace_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_API_NATIVE_BUILD_DIR=/ ./test-linuxcnc-api-native.sh >"$invalid_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-api-native.sh accepted filesystem root as build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_API_NATIVE_BUILD_DIR must not be the filesystem root" "$invalid_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-api-native.sh did not report filesystem-root build dir clearly" >&2
+    sed -n '1,20p' "$invalid_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_API_NATIVE_BUILD_DIR=/tmp/.. ./test-linuxcnc-api-native.sh >"$invalid_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-api-native.sh accepted canonical filesystem root as build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_API_NATIVE_BUILD_DIR must not be the filesystem root" "$invalid_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-api-native.sh did not report canonical filesystem-root build dir clearly" >&2
+    sed -n '1,20p' "$invalid_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_API_NATIVE_BUILD_DIR= ./test-linuxcnc-api-native.sh >"$empty_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-api-native.sh accepted empty build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_API_NATIVE_BUILD_DIR must not be empty" "$empty_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-api-native.sh did not report empty build dir clearly" >&2
+    sed -n '1,20p' "$empty_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_API_NATIVE_BUILD_DIR="build/api native test" ./test-linuxcnc-api-native.sh >"$whitespace_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-api-native.sh accepted whitespace in build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_API_NATIVE_BUILD_DIR must not contain whitespace: build/api native test" "$whitespace_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-api-native.sh did not report whitespace build dir clearly" >&2
+    sed -n '1,20p' "$whitespace_build_dir_log" >&2
+    exit 1
+fi
 if CNC_SIM_SOURCE_SYNTAX_BUILD_DIR=/ ./test-linuxcnc-source-syntax.sh >"$invalid_build_dir_log" 2>&1; then
     echo "test-linuxcnc-source-syntax.sh accepted filesystem root as build dir" >&2
     exit 1
@@ -370,6 +723,78 @@ if ! grep -F "CNC_SIM_SOURCE_SYNTAX_BUILD_DIR must not contain whitespace: build
     sed -n '1,20p' "$whitespace_build_dir_log" >&2
     exit 1
 fi
+if CNC_SIM_SOURCE_OBJECTS_BUILD_DIR=/ ./test-linuxcnc-source-objects.sh >"$invalid_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-source-objects.sh accepted filesystem root as build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_SOURCE_OBJECTS_BUILD_DIR must not be the filesystem root" "$invalid_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-source-objects.sh did not report filesystem-root build dir clearly" >&2
+    sed -n '1,20p' "$invalid_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_SOURCE_OBJECTS_BUILD_DIR=/tmp/.. ./test-linuxcnc-source-objects.sh >"$invalid_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-source-objects.sh accepted normalized filesystem root as build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_SOURCE_OBJECTS_BUILD_DIR must not be the filesystem root" "$invalid_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-source-objects.sh did not report normalized filesystem-root build dir clearly" >&2
+    sed -n '1,20p' "$invalid_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_SOURCE_OBJECTS_BUILD_DIR= ./test-linuxcnc-source-objects.sh >"$empty_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-source-objects.sh accepted empty build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_SOURCE_OBJECTS_BUILD_DIR must not be empty" "$empty_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-source-objects.sh did not report empty build dir clearly" >&2
+    sed -n '1,20p' "$empty_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_SOURCE_OBJECTS_BUILD_DIR="build/source objects test" ./test-linuxcnc-source-objects.sh >"$whitespace_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-source-objects.sh accepted whitespace in build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_SOURCE_OBJECTS_BUILD_DIR must not contain whitespace: build/source objects test" "$whitespace_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-source-objects.sh did not report whitespace build dir clearly" >&2
+    sed -n '1,20p' "$whitespace_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_RS274_NATIVE_BUILD_DIR=/ ./test-linuxcnc-rs274-native.sh >"$invalid_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-rs274-native.sh accepted filesystem root as build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_RS274_NATIVE_BUILD_DIR must not be the filesystem root" "$invalid_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-rs274-native.sh did not report filesystem-root build dir clearly" >&2
+    sed -n '1,20p' "$invalid_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_RS274_NATIVE_BUILD_DIR=/tmp/.. ./test-linuxcnc-rs274-native.sh >"$invalid_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-rs274-native.sh accepted normalized filesystem root as build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_RS274_NATIVE_BUILD_DIR must not be the filesystem root" "$invalid_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-rs274-native.sh did not report normalized filesystem-root build dir clearly" >&2
+    sed -n '1,20p' "$invalid_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_RS274_NATIVE_BUILD_DIR= ./test-linuxcnc-rs274-native.sh >"$empty_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-rs274-native.sh accepted empty build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_RS274_NATIVE_BUILD_DIR must not be empty" "$empty_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-rs274-native.sh did not report empty build dir clearly" >&2
+    sed -n '1,20p' "$empty_build_dir_log" >&2
+    exit 1
+fi
+if CNC_SIM_RS274_NATIVE_BUILD_DIR="build/rs274 native test" ./test-linuxcnc-rs274-native.sh >"$whitespace_build_dir_log" 2>&1; then
+    echo "test-linuxcnc-rs274-native.sh accepted whitespace in build dir" >&2
+    exit 1
+fi
+if ! grep -F "CNC_SIM_RS274_NATIVE_BUILD_DIR must not contain whitespace: build/rs274 native test" "$whitespace_build_dir_log" >/dev/null; then
+    echo "test-linuxcnc-rs274-native.sh did not report whitespace build dir clearly" >&2
+    sed -n '1,20p' "$whitespace_build_dir_log" >&2
+    exit 1
+fi
 if CNC_SIM_SOURCE_LINK_BUILD_DIR=/ ./test-linuxcnc-source-link.sh >"$invalid_build_dir_log" 2>&1; then
     echo "test-linuxcnc-source-link.sh accepted filesystem root as build dir" >&2
     exit 1
@@ -573,7 +998,8 @@ if ! grep -F "unknown manifest source output mode: bogus" "$unknown_output_log"
     exit 1
 fi
 native_manifest_core_full=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-manifest-sources.sh "$manifest" core full)
-grep -Fx "$linuxcnc_root/src/emc/rs274ngc/interp_arc.cc" <<<"$native_manifest_core_full" >/dev/null
+linuxcnc_root_full=$(cd "$linuxcnc_root" && pwd)
+grep -Fx "$linuxcnc_root_full/src/emc/rs274ngc/interp_arc.cc" <<<"$native_manifest_core_full" >/dev/null
 
 kinematics_manifest_config=$(./list-linuxcnc-kinematics-manifest-sources.sh linuxcnc-kinematics-source-files.txt config)
 grep -Fx "configs/sim/axis/vismach/5axis/table-rotary-tilting/xyzac-trt.ini" <<<"$kinematics_manifest_config" >/dev/null
@@ -732,6 +1158,11 @@ if ! grep -F "missing manifest source: src/emc/rs274ngc/does_not_exist.cc" "$mis
     exit 1
 fi
 
+if [[ "$guardrails_only" == "1" ]]; then
+    echo "all native guardrail checks passed"
+    exit 0
+fi
+
 ./test-native.sh
 ./test-linuxcnc-source-syntax.sh "$manifest"
 ./test-linuxcnc-source-objects.sh "$manifest"

test-linuxcnc-api-native.sh

@@ -5,38 +5,158 @@ cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_native.XXXXXX")
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+build_dir=${CNC_SIM_API_NATIVE_BUILD_DIR-build/api-native-test}
+if [[ -z "$build_dir" ]]; then
+    echo "CNC_SIM_API_NATIVE_BUILD_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$build_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_API_NATIVE_BUILD_DIR must not contain whitespace: $build_dir" >&2
+    exit 1
+fi
+mkdir -p "$build_dir"
+build_dir=$(cd "$build_dir" && pwd)
+if [[ "$build_dir" == "/" ]]; then
+    echo "CNC_SIM_API_NATIVE_BUILD_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 9>"$build_dir/api-native.lock"
+flock 9
+preflight_cache_dir="$build_dir/preflight-cache"
+
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
 var_file="$build_dir/rs274ngc-api.var"
 cp "$linuxcnc_root/tests/halui/jogging/sim.var" "$var_file"
 
-project_source_list="$build_dir/linuxcnc_rs274_api_project_sources.txt"
-./list-linuxcnc-rs274-api-project-sources.sh > "$project_source_list"
-mapfile -t project_sources < "$project_source_list"
-
 common_flag_output=$(
-    LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-common-cxxflags.sh \
+    CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" \
+        LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-common-cxxflags.sh \
         --no-ulapi \
         --python \
         --core-include \
         --core-src
 )
 mapfile -t common_flags <<<"$common_flag_output"
-link_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-native-linkflags.sh)
+link_flag_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-native-linkflags.sh)
 mapfile -t link_flags <<<"$link_flag_output"
+bridge_object_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./build-linuxcnc-native-bridge-objects.sh)
+mapfile -t bridge_objects <<<"$bridge_object_output"
+bridge_source_list="$build_dir/linuxcnc_bridge_smoke_project_sources.txt"
+./list-linuxcnc-bridge-smoke-project-sources.sh > "$bridge_source_list"
+mapfile -t bridge_sources < "$bridge_source_list"
+project_source_list="$build_dir/linuxcnc_rs274_api_project_sources.txt"
+./list-linuxcnc-rs274-api-project-sources.sh > "$project_source_list"
+mapfile -t api_sources < "$project_source_list"
 
-"$cxx" "${common_flags[@]}" \
-    -DCNC_SIM_ENABLE_LINUXCNC_RS274_BACKEND \
-    "${project_sources[@]}" \
-    core/tests/cnc_sim_api_linuxcnc_rs274_smoke.cpp \
-    "${link_flags[@]}" \
-    -lrs274 \
-    -ltooldata \
-    -lpython3.13 \
-    -o "$build_dir/cnc_sim_api_linuxcnc_rs274_smoke"
+is_bridge_source() {
+    local source=$1
+    local candidate
+    for candidate in "${bridge_sources[@]}"; do
+        if [[ "$candidate" == "$source" ]]; then
+            return 0
+        fi
+    done
+    return 1
+}
 
-CNC_SIM_RS274_VAR="$var_file" "$build_dir/cnc_sim_api_linuxcnc_rs274_smoke"
+objects=()
+project_index=0
+api_extra_sources=()
+for source in "${api_sources[@]}"; do
+    if is_bridge_source "$source"; then
+        continue
+    fi
+    api_extra_sources+=("$source")
+    objects+=("$build_dir/project_${project_index}.o")
+    project_index=$((project_index + 1))
+done
+main_object="$build_dir/cnc_sim_api_linuxcnc_rs274_smoke.o"
+objects+=("$main_object")
+target="$build_dir/cnc_sim_api_linuxcnc_rs274_smoke"
+
+api_signature="$build_dir/api-native.signature"
+api_next_signature="$build_dir/api-native.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'LINK_FLAGS='
+    printf ' %s' "${link_flags[@]}"
+    printf '\n'
+    printf 'BRIDGE_OBJECTS:\n'
+    printf '%s\n' "${bridge_objects[@]}"
+    printf 'API_EXTRA_SOURCES:\n'
+    printf '%s\n' "${api_extra_sources[@]}"
+} > "$api_next_signature"
+if [[ ! -f "$api_signature" ]] || ! cmp -s "$api_signature" "$api_next_signature"; then
+    rm -f "$build_dir"/project_*.o \
+        "$build_dir"/*.d \
+        "$main_object" \
+        "$target"
+fi
+mv "$api_next_signature" "$api_signature"
+
+api_makefile="$build_dir/api-native.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'LINK_FLAGS :='
+    printf ' %s' "${link_flags[@]}"
+    printf '\n'
+    printf 'BRIDGE_OBJECTS :='
+    printf ' %s' "${bridge_objects[@]}"
+    printf '\n'
+    printf 'OBJECTS :='
+    printf ' %s' "${objects[@]}"
+    printf '\n\n'
+    printf 'DEP_FILES :=\n'
+    for object in "${objects[@]}"; do
+        printf 'DEP_FILES += %s.d\n' "$object"
+    done
+    printf '\n.PHONY: all\n'
+    printf 'all: %s\n\n' "$target"
+
+    project_index=0
+    for source in "${api_extra_sources[@]}"; do
+        source_flags=()
+        case "$source" in
+            core/src/gcode_backend.cpp)
+                source_flags+=(-DCNC_SIM_ENABLE_LINUXCNC_RS274_BACKEND)
+                ;;
+        esac
+        printf '%s: %s\n' "$build_dir/project_${project_index}.o" "$source"
+        printf '\t@$(CXX) $(COMMON_FLAGS)'
+        printf ' %s' "${source_flags[@]}"
+        printf ' -MMD -MP -MF %s.d -c %s -o %s\n\n' \
+            "$build_dir/project_${project_index}.o" "$source" "$build_dir/project_${project_index}.o"
+        project_index=$((project_index + 1))
+    done
+
+    printf '%s: core/tests/cnc_sim_api_linuxcnc_rs274_smoke.cpp\n' "$main_object"
+    printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c core/tests/cnc_sim_api_linuxcnc_rs274_smoke.cpp -o %s\n\n' \
+        "$main_object" "$main_object"
+    printf '%s: $(BRIDGE_OBJECTS) $(OBJECTS)\n' "$target"
+    printf '\t@$(CXX) $(BRIDGE_OBJECTS) $(OBJECTS) $(LINK_FLAGS) -lrs274 -ltooldata -lpython3.13 -o %s\n\n' "$target"
+    printf '\n-include $(DEP_FILES)\n'
+} > "$api_makefile"
+make --output-sync=target -j"$build_jobs" -f "$api_makefile"
+
+CNC_SIM_RS274_VAR="$var_file" "$target"
 
 echo "linuxcnc rs274 API backend smoke passed"

test-linuxcnc-bridge-native.sh

@@ -5,31 +5,110 @@ cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_native.XXXXXX")
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+build_dir=${CNC_SIM_BRIDGE_NATIVE_BUILD_DIR-build/bridge-native-test}
+if [[ -z "$build_dir" ]]; then
+    echo "CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$build_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not contain whitespace: $build_dir" >&2
+    exit 1
+fi
+mkdir -p "$build_dir"
+build_dir=$(cd "$build_dir" && pwd)
+if [[ "$build_dir" == "/" ]]; then
+    echo "CNC_SIM_BRIDGE_NATIVE_BUILD_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 9>"$build_dir/bridge-native.lock"
+flock 9
+preflight_cache_dir="$build_dir/preflight-cache"
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
-project_source_list="$build_dir/linuxcnc_bridge_smoke_project_sources.txt"
-./list-linuxcnc-bridge-smoke-project-sources.sh > "$project_source_list"
-mapfile -t project_sources < "$project_source_list"
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 
 common_flag_output=$(
-    LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-common-cxxflags.sh \
+    CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" \
+        LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-common-cxxflags.sh \
         --no-ulapi \
         --core-include \
         --core-src
 )
 mapfile -t common_flags <<<"$common_flag_output"
-link_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-native-linkflags.sh)
+link_flag_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-native-linkflags.sh)
 mapfile -t link_flags <<<"$link_flag_output"
+bridge_object_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./build-linuxcnc-native-bridge-objects.sh)
+mapfile -t bridge_objects <<<"$bridge_object_output"
+project_source_list="$build_dir/linuxcnc_bridge_smoke_project_sources.txt"
+./list-linuxcnc-bridge-smoke-project-sources.sh > "$project_source_list"
 
-"$cxx" "${common_flags[@]}" \
-    "${project_sources[@]}" \
-    core/tests/linuxcnc_canon_bridge_smoke.cpp \
-    "${link_flags[@]}" \
-    -ltooldata \
-    -o "$build_dir/linuxcnc_canon_bridge_smoke"
+objects=()
+main_object="$build_dir/linuxcnc_canon_bridge_smoke.o"
+objects+=("$main_object")
+target="$build_dir/linuxcnc_canon_bridge_smoke"
 
-"$build_dir/linuxcnc_canon_bridge_smoke"
+bridge_signature="$build_dir/bridge-native.signature"
+bridge_next_signature="$build_dir/bridge-native.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'LINK_FLAGS='
+    printf ' %s' "${link_flags[@]}"
+    printf '\n'
+    printf 'BRIDGE_OBJECTS:\n'
+    printf '%s\n' "${bridge_objects[@]}"
+} > "$bridge_next_signature"
+if [[ ! -f "$bridge_signature" ]] || ! cmp -s "$bridge_signature" "$bridge_next_signature"; then
+    rm -f "$build_dir"/*.d \
+        "$main_object" \
+        "$target"
+fi
+mv "$bridge_next_signature" "$bridge_signature"
+
+bridge_makefile="$build_dir/bridge-native.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'LINK_FLAGS :='
+    printf ' %s' "${link_flags[@]}"
+    printf '\n'
+    printf 'BRIDGE_OBJECTS :='
+    printf ' %s' "${bridge_objects[@]}"
+    printf '\n'
+    printf 'OBJECTS :='
+    printf ' %s' "${objects[@]}"
+    printf '\n\n'
+    printf 'DEP_FILES :=\n'
+    for object in "${objects[@]}"; do
+        printf 'DEP_FILES += %s.d\n' "$object"
+    done
+    printf '\n.PHONY: all\n'
+    printf 'all: %s\n\n' "$target"
+
+    printf '%s: core/tests/linuxcnc_canon_bridge_smoke.cpp\n' "$main_object"
+    printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c core/tests/linuxcnc_canon_bridge_smoke.cpp -o %s\n\n' \
+        "$main_object" "$main_object"
+    printf '%s: $(BRIDGE_OBJECTS) $(OBJECTS)\n' "$target"
+    printf '\t@$(CXX) $(BRIDGE_OBJECTS) $(OBJECTS) $(LINK_FLAGS) -ltooldata -o %s\n\n' "$target"
+    printf '\n-include $(DEP_FILES)\n'
+} > "$bridge_makefile"
+make --output-sync=target -j"$build_jobs" -f "$bridge_makefile"
+
+"$target"
 
 echo "linuxcnc canon bridge smoke passed"

test-linuxcnc-rs274-native.sh

@@ -5,10 +5,33 @@ cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_native.XXXXXX")
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+build_dir=${CNC_SIM_RS274_NATIVE_BUILD_DIR-build/rs274-native-test}
+if [[ -z "$build_dir" ]]; then
+    echo "CNC_SIM_RS274_NATIVE_BUILD_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$build_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_RS274_NATIVE_BUILD_DIR must not contain whitespace: $build_dir" >&2
+    exit 1
+fi
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
+mkdir -p "$build_dir"
+build_dir=$(cd "$build_dir" && pwd)
+if [[ "$build_dir" == "/" ]]; then
+    echo "CNC_SIM_RS274_NATIVE_BUILD_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+preflight_cache_dir="$build_dir/preflight-cache"
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 # The LinuxCNC rs274 backend path can bus-error when two dumps run concurrently.
 exec 9>"${TMPDIR:-/tmp}/cnc_sim_linuxcnc_rs274_native.lock"
 flock 9
@@ -36,13 +59,68 @@ mapfile -t common_flags <<<"$common_flag_output"
 link_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-native-linkflags.sh)
 mapfile -t link_flags <<<"$link_flag_output"
 
-"$cxx" "${common_flags[@]}" \
-    "${project_sources[@]}" \
-    "${link_flags[@]}" \
-    -lrs274 \
-    -ltooldata \
-    -lpython3.13 \
-    -o "$build_dir/linuxcnc_rs274_dump"
+project_objects=()
+project_index=0
+for source in "${project_sources[@]}"; do
+    project_objects+=("$build_dir/project_${project_index}.o")
+    project_index=$((project_index + 1))
+done
+
+rs274_native_signature="$build_dir/rs274-native.signature"
+rs274_native_next_signature="$build_dir/rs274-native.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'LINK_FLAGS='
+    printf ' %s' "${link_flags[@]}"
+    printf '\n'
+    printf 'PROJECT_SOURCES:\n'
+    printf '%s\n' "${project_sources[@]}"
+} > "$rs274_native_next_signature"
+if [[ ! -f "$rs274_native_signature" ]] || ! cmp -s "$rs274_native_signature" "$rs274_native_next_signature"; then
+    rm -f "$build_dir"/project_*.o \
+        "$build_dir"/project_*.o.d \
+        "$build_dir/linuxcnc_rs274_dump"
+fi
+mv "$rs274_native_next_signature" "$rs274_native_signature"
+
+rs274_native_makefile="$build_dir/rs274-native.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'LINK_FLAGS :='
+    printf ' %s' "${link_flags[@]}"
+    printf '\n\n'
+    printf 'PROJECT_OBJECTS :='
+    printf ' %s' "${project_objects[@]}"
+    printf '\n\n'
+    printf 'DEP_FILES :=\n'
+    for object in "${project_objects[@]}"; do
+        printf 'DEP_FILES += %s.d\n' "$object"
+    done
+    printf '\n.PHONY: all\n'
+    printf 'all: %s\n\n' "$build_dir/linuxcnc_rs274_dump"
+
+    project_index=0
+    for source in "${project_sources[@]}"; do
+        printf '%s: %s\n' "${project_objects[$project_index]}" "$source"
+        printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n' \
+            "${project_objects[$project_index]}" "$source" "${project_objects[$project_index]}"
+        project_index=$((project_index + 1))
+    done
+
+    printf '%s: $(PROJECT_OBJECTS)\n' "$build_dir/linuxcnc_rs274_dump"
+    printf '\t@$(CXX) $(PROJECT_OBJECTS) $(LINK_FLAGS) -lrs274 -ltooldata -lpython3.13 -o %s\n' "$build_dir/linuxcnc_rs274_dump"
+    printf '\n-include $(DEP_FILES)\n'
+} > "$rs274_native_makefile"
+make --output-sync=target -j"$build_jobs" -f "$rs274_native_makefile"
 
 CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/linuxcnc_basic_motion.ngc >"$output_dir/cnc_sim_linuxcnc_basic_motion.json"
 CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/basic_mill.ngc >"$output_dir/cnc_sim_linuxcnc_basic_mill.json"

test-linuxcnc-source-link.sh

@@ -30,9 +30,10 @@ if [[ "$build_dir" == "/" ]]; then
     echo "CNC_SIM_SOURCE_LINK_BUILD_DIR must not be the filesystem root" >&2
     exit 1
 fi
+preflight_cache_dir="$build_dir/preflight-cache"
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest"
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-switchkins-remap-table.sh linuxcnc-kinematics-source-files.txt
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-switchkins-remap-table-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-kinematics-source-files.txt
 # The LinuxCNC source-linked dump path is not concurrency-safe under parallel execution.
 exec 9>"${TMPDIR:-/tmp}/cnc_sim_rs274_source_link.lock"
 flock 9
@@ -47,9 +48,9 @@ mapfile -t common_flags <<<"$common_flag_output"
 link_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-native-linkflags.sh)
 mapfile -t link_flags <<<"$link_flag_output"
 
-source_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-manifest-sources.sh "$manifest" core full)
+source_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-manifest-sources.sh "$manifest" core full)
 mapfile -t linuxcnc_sources <<<"$source_output"
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest" --require-rs274-complete
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest" --require-rs274-complete
 
 objects=()
 linuxcnc_index=0
@@ -79,6 +80,7 @@ source_link_next_signature="$build_dir/source-link-build.signature.next"
     printf 'CXX=%s\n' "$cxx"
     printf 'PWD=%s\n' "$PWD"
     printf 'LINUXCNC_ROOT=%s\n' "$(cd "$linuxcnc_root" && pwd)"
+    printf 'BUILD_RULE_VERSION=1\n'
     printf 'COMMON_FLAGS='
     printf ' %s' "${common_flags[@]}"
     printf '\n'

test-linuxcnc-source-objects.sh

@@ -5,24 +5,97 @@ cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_rs274_objects.XXXXXX")
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+build_dir=${CNC_SIM_SOURCE_OBJECTS_BUILD_DIR-build/source-objects-test}
+if [[ -z "$build_dir" ]]; then
+    echo "CNC_SIM_SOURCE_OBJECTS_BUILD_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$build_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_SOURCE_OBJECTS_BUILD_DIR must not contain whitespace: $build_dir" >&2
+    exit 1
+fi
 manifest=${1:-linuxcnc-rs274-source-files.txt}
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
+mkdir -p "$build_dir"
+build_dir=$(cd "$build_dir" && pwd)
+if [[ "$build_dir" == "/" ]]; then
+    echo "CNC_SIM_SOURCE_OBJECTS_BUILD_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 9>"$build_dir/source-objects.lock"
+flock 9
+preflight_cache_dir="$build_dir/preflight-cache"
+
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest"
+manifest=$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 
 common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-common-cxxflags.sh --python)
 mapfile -t common_flags <<<"$common_flag_output"
 
-source_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-manifest-sources.sh "$manifest" core full)
+source_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-manifest-sources.sh "$manifest" core full)
 mapfile -t sources <<<"$source_output"
 
+objects=()
 source_index=0
 for source in "${sources[@]}"; do
-    obj="$build_dir/linuxcnc_${source_index}.o"
-    "$cxx" "${common_flags[@]}" -c "$source" -o "$obj"
+    objects+=("$build_dir/linuxcnc_${source_index}.o")
     source_index=$((source_index + 1))
 done
 
+source_objects_signature="$build_dir/source-objects.signature"
+source_objects_next_signature="$build_dir/source-objects.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'MANIFEST=%s\n' "$manifest"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'SOURCES:\n'
+    printf '%s\n' "${sources[@]}"
+} > "$source_objects_next_signature"
+if [[ ! -f "$source_objects_signature" ]] || ! cmp -s "$source_objects_signature" "$source_objects_next_signature"; then
+    rm -f "$build_dir"/linuxcnc_*.o "$build_dir"/linuxcnc_*.o.d
+fi
+mv "$source_objects_next_signature" "$source_objects_signature"
+
+source_objects_makefile="$build_dir/source-objects.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n\n'
+    printf 'OBJECTS :='
+    printf ' %s' "${objects[@]}"
+    printf '\n\n'
+    printf 'DEP_FILES :=\n'
+    for object in "${objects[@]}"; do
+        printf 'DEP_FILES += %s.d\n' "$object"
+    done
+    printf '\n.PHONY: all\n'
+    printf 'all: $(OBJECTS)\n\n'
+
+    source_index=0
+    for source in "${sources[@]}"; do
+        printf '%s: %s\n' "${objects[$source_index]}" "$source"
+        printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n' \
+            "${objects[$source_index]}" "$source" "${objects[$source_index]}"
+        source_index=$((source_index + 1))
+    done
+    printf '\n-include $(DEP_FILES)\n'
+} > "$source_objects_makefile"
+make --output-sync=target -j"$build_jobs" -f "$source_objects_makefile"
+
 echo "linuxcnc rs274 source object build passed (${#sources[@]} objects)"
 echo "built objects in $build_dir"

test-linuxcnc-source-syntax.sh

@@ -13,6 +13,11 @@ if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
     echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
     exit 1
 fi
+self_checks=${CNC_SIM_SOURCE_SYNTAX_SELF_CHECKS:-0}
+if [[ "$self_checks" != "0" && "$self_checks" != "1" ]]; then
+    echo "CNC_SIM_SOURCE_SYNTAX_SELF_CHECKS must be 0 or 1: $self_checks" >&2
+    exit 1
+fi
 build_dir=${CNC_SIM_SOURCE_SYNTAX_BUILD_DIR-build/source-syntax-test}
 if [[ -z "$build_dir" ]]; then
     echo "CNC_SIM_SOURCE_SYNTAX_BUILD_DIR must not be empty" >&2
@@ -31,8 +36,9 @@ fi
 exec 9>"$build_dir/source-syntax.lock"
 flock 9
 manifest=${1:-linuxcnc-rs274-source-files.txt}
+preflight_cache_dir="$build_dir/preflight-cache"
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest"
 
 missing_source_manifest=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_missing_rs274_manifest_source.XXXXXX.txt")
 missing_source_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_missing_rs274_manifest_source.XXXXXX.log")
@@ -46,9 +52,11 @@ if awk '/^rm -f "\$missing_source_manifest" "\$missing_source_log"$/{ found = 1
     echo "linuxcnc source syntax probe still relies on manual cleanup for missing-source temporaries" >&2
     exit 1
 fi
-LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-manifest-sources.sh "$manifest" core full > "$source_list"
-LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-manifest-sources.sh "$manifest" binding full >> "$source_list"
-LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-manifest-sources.sh "$manifest" tooldata full >> "$source_list"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-manifest-sources.sh "$manifest" core full > "$source_list"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-manifest-sources.sh "$manifest" binding full >> "$source_list"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-manifest-sources.sh "$manifest" tooldata full >> "$source_list"
+
+if [[ "$self_checks" == "1" ]]; then
 
 printf 'core:src/emc/rs274ngc/does_not_exist.cc:test missing source\n' >"$missing_source_manifest"
 if ./test-linuxcnc-source-objects.sh "$missing_source_manifest" >"$missing_source_log" 2>&1; then
@@ -70,6 +78,8 @@ if ! grep -F "missing manifest source: src/emc/rs274ngc/does_not_exist.cc" "$mis
     exit 1
 fi
 
+fi
+
 common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-common-cxxflags.sh --python --syntax-only)
 mapfile -t common_flags <<<"$common_flag_output"
 
@@ -80,7 +90,7 @@ source_syntax_next_signature="$build_dir/source-syntax.signature.next"
     printf 'PWD=%s\n' "$PWD"
     printf 'LINUXCNC_ROOT=%s\n' "$(cd "$linuxcnc_root" && pwd)"
     printf 'MANIFEST=%s\n' "$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")"
-    printf 'BUILD_JOBS=%s\n' "$build_jobs"
+    printf 'BUILD_RULE_VERSION=1\n'
     printf 'COMMON_FLAGS='
     printf ' %s' "${common_flags[@]}"
     printf '\n'

test-linuxcnc-wasm-blockers.sh

@@ -4,6 +4,32 @@ set -euo pipefail
 cd "$(dirname "$0")"
 
 manifest=${1:-linuxcnc-rs274-wasm-source-files.txt}
+self_checks=${CNC_SIM_WASM_BLOCKERS_SELF_CHECKS:-0}
+if [[ "$self_checks" != "0" && "$self_checks" != "1" ]]; then
+    echo "CNC_SIM_WASM_BLOCKERS_SELF_CHECKS must be 0 or 1: $self_checks" >&2
+    exit 1
+fi
+linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+cache_dir=${CNC_SIM_WASM_BLOCKERS_CACHE_DIR-${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/wasm-blocker-cache}}
+if [[ -z "$cache_dir" ]]; then
+    echo "CNC_SIM_WASM_BLOCKERS_CACHE_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$cache_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_WASM_BLOCKERS_CACHE_DIR must not contain whitespace: $cache_dir" >&2
+    exit 1
+fi
+mkdir -p "$cache_dir"
+cache_dir=$(cd "$cache_dir" && pwd)
+if [[ "$cache_dir" == "/" ]]; then
+    echo "CNC_SIM_WASM_BLOCKERS_CACHE_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$cache_dir/preflight" "$manifest"
+manifest=$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
+
+if [[ "$self_checks" == "1" ]]; then
 
 missing_manifest=${TMPDIR:-/tmp}/cnc_sim_missing_wasm_blocker_manifest.txt
 missing_manifest_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_missing_wasm_blocker_manifest.XXXXXX.log")
@@ -49,8 +75,6 @@ if ! grep -F "missing LinuxCNC root: $missing_root" "$missing_root_log" >/dev/nu
     exit 1
 fi
 
-output=$(./analyze-linuxcnc-wasm-blockers.sh "$manifest")
-
 printf 'blocked:src/emc/tooldata/does_not_exist.cc:test missing blocked source\n' >"$missing_source_manifest"
 if ./analyze-linuxcnc-wasm-blockers.sh "$missing_source_manifest" >"$missing_source_log" 2>&1; then
     echo "wasm blocker analyzer accepted missing manifest source" >&2
@@ -91,6 +115,57 @@ if ! grep -F "missing blocked replacement mapping: src/emc/tooldata/tooldata_db.
     exit 1
 fi
 
+fi
+
+manifest_key=$(printf '%s' "$manifest" | sha256sum | awk '{ print $1 }')
+exec 8>"$cache_dir/wasm-blockers.lock"
+flock 8
+cache_signature="$cache_dir/wasm-blockers.${manifest_key}.signature"
+cache_output="$cache_dir/wasm-blockers.${manifest_key}.out"
+next_signature="$cache_signature.next"
+write_manifest_source_stats() {
+    local group path note source_path
+    while IFS=: read -r group path note; do
+        case "$group" in
+            ""|\#*)
+                continue
+                ;;
+        esac
+        [[ -z "${path:-}" ]] && continue
+        source_path="$linuxcnc_root/$path"
+        [[ -f "$source_path" ]] || return 1
+        stat -c 'SOURCE=%n:%s:%y' "$source_path"
+    done < "$manifest"
+}
+write_shim_source_hashes() {
+    local shim_source
+    while IFS= read -r shim_source; do
+        [[ -n "$shim_source" ]] || continue
+        [[ -f "$shim_source" ]] || return 1
+        sha256sum "$shim_source"
+    done < <(./list-linuxcnc-wasm-safe-shims.sh)
+}
+{
+    printf 'ANALYZER='
+    sha256sum analyze-linuxcnc-wasm-blockers.sh
+    printf 'SHIM_LISTER='
+    sha256sum list-linuxcnc-wasm-safe-shims.sh
+    printf 'MANIFEST_PATH=%s\n' "$manifest"
+    printf 'MANIFEST='
+    sha256sum "$manifest"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    write_manifest_source_stats
+    write_shim_source_hashes
+} > "$next_signature"
+if [[ -f "$cache_signature" && -f "$cache_output" ]] && cmp -s "$cache_signature" "$next_signature"; then
+    output=$(cat "$cache_output")
+    rm -f "$next_signature"
+else
+    output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$cache_dir/preflight" LINUXCNC_ROOT="$linuxcnc_root" ./analyze-linuxcnc-wasm-blockers.sh "$manifest")
+    printf '%s\n' "$output" > "$cache_output"
+    mv "$next_signature" "$cache_signature"
+fi
+
 grep -F "[manifest]" <<<"$output" >/dev/null
 grep -F "core=25" <<<"$(sed -n '/^\[manifest\]/,/^$/p' <<<"$output")" >/dev/null
 grep -F "blocked=9" <<<"$(sed -n '/^\[manifest\]/,/^$/p' <<<"$output")" >/dev/null

test-linuxcnc-wasm-cmake-safe-probe.sh

@@ -9,9 +9,19 @@ if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
     echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
     exit 1
 fi
+self_checks=${CNC_SIM_WASM_CMAKE_SAFE_PROBE_SELF_CHECKS:-0}
+if [[ "$self_checks" != "0" && "$self_checks" != "1" ]]; then
+    echo "CNC_SIM_WASM_CMAKE_SAFE_PROBE_SELF_CHECKS must be 0 or 1: $self_checks" >&2
+    exit 1
+fi
 cmake_compiler_launcher_mode=none
+cmake_compiler_launcher_args=()
 if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
     cmake_compiler_launcher_mode=ccache
+    cmake_compiler_launcher_args+=(
+        -DCMAKE_C_COMPILER_LAUNCHER=ccache
+        -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
+    )
 fi
 build_dir=${CNC_SIM_WASM_CMAKE_SAFE_PROBE_BUILD_DIR-build/wasm-cmake-safe-probe}
 if [[ -z "$build_dir" ]]; then
@@ -37,6 +47,15 @@ invalid_build_jobs_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_build_wasm_invalid_jobs
 invalid_build_dir_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_build_wasm_invalid_dir.XXXXXX.log")
 empty_build_dir_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_build_wasm_empty_dir.XXXXXX.log")
 whitespace_build_dir_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_build_wasm_whitespace_dir.XXXXXX.log")
+wasm_probe_object_cache_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_probe_object_cache.XXXXXX.log")
+wasm_blockers_cache_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_blockers_cache.XXXXXX.log")
+wasm_link_probe_cache_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_link_probe_cache.XXXXXX.log")
+wasm_standalone_probe_cache_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_standalone_probe_cache.XXXXXX.log")
+wasm_source_syntax_build_dir_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_source_syntax_build_dir.XXXXXX.log")
+wasm_python_c_api_build_dir_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_python_c_api_build_dir.XXXXXX.log")
+wasm_interp_find_build_dir_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_interp_find_build_dir.XXXXXX.log")
+wasm_tooldata_mmap_build_dir_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_tooldata_mmap_build_dir.XXXXXX.log")
+wasm_tooldata_runtime_build_dir_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_tooldata_runtime_build_dir.XXXXXX.log")
 
 cleanup_wasm_cmake_probe_temps() {
     local temp_path
@@ -48,6 +67,15 @@ cleanup_wasm_cmake_probe_temps() {
         "$invalid_build_dir_log" \
         "$empty_build_dir_log" \
         "$whitespace_build_dir_log" \
+        "$wasm_probe_object_cache_log" \
+        "$wasm_blockers_cache_log" \
+        "$wasm_link_probe_cache_log" \
+        "$wasm_standalone_probe_cache_log" \
+        "$wasm_source_syntax_build_dir_log" \
+        "$wasm_python_c_api_build_dir_log" \
+        "$wasm_interp_find_build_dir_log" \
+        "$wasm_tooldata_mmap_build_dir_log" \
+        "$wasm_tooldata_runtime_build_dir_log" \
         "${build_next_signature:-}" \
         "${unknown_manifest_filter_log:-}" \
         "${unknown_manifest_output_log:-}" \
@@ -92,9 +120,10 @@ cleanup_wasm_cmake_probe_temps() {
 }
 trap cleanup_wasm_cmake_probe_temps EXIT
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
 manifest=$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")
 linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-"$build_dir/preflight-cache"}
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest"
 build_signature="$build_dir/wasm-cmake-safe-probe.signature"
 build_next_signature=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_cmake_safe_probe.signature.XXXXXX")
 {
@@ -102,15 +131,23 @@ build_next_signature=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_cmake_safe_probe.sig
     printf 'PWD=%s\n' "$PWD"
     printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
     printf 'MANIFEST=%s\n' "$manifest"
-    printf 'BUILD_JOBS=%s\n' "$build_jobs"
+    printf 'MANIFEST_HASH='
+    sha256sum "$manifest"
     printf 'COMPILER_LAUNCHER=%s\n' "$cmake_compiler_launcher_mode"
+    printf 'CMAKE_LISTS='
+    sha256sum core/CMakeLists.txt
+    printf 'CONFIGURE_RULE_VERSION=1\n'
 } > "$build_next_signature"
+configure_cmake=1
 if [[ ! -f "$build_signature" ]] || ! cmp -s "$build_signature" "$build_next_signature"; then
-    rm -rf "$build_dir"
     mkdir -p "$build_dir"
+elif [[ -f "$build_dir/CMakeCache.txt" ]]; then
+    configure_cmake=0
 fi
 mv "$build_next_signature" "$build_signature"
 
+if [[ "$self_checks" == "1" ]]; then
+
 rm -f "$missing_manifest"
 if CNC_SIM_BUILD_WASM_SKIP_LOCK=1 ./build-wasm.sh "$missing_manifest" >"$missing_manifest_log" 2>&1; then
     echo "build-wasm accepted missing manifest: $missing_manifest" >&2
@@ -171,8 +208,35 @@ fi
 grep -F 'exec 9>"${TMPDIR:-/tmp}/cnc_sim_build_wasm.lock"' build-wasm.sh >/dev/null
 grep -F "flock 9" build-wasm.sh >/dev/null
 grep -F -- './test-linuxcnc-wasm-blockers.sh "$manifest"' build-wasm.sh >/dev/null
+grep -F -- 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-blockers.sh "$manifest"' build-wasm.sh >/dev/null
+grep -F 'check-linuxcnc-inputs-cached.sh "$manifest"' analyze-linuxcnc-wasm-blockers.sh >/dev/null
+grep -F 'CNC_SIM_WASM_BLOCKERS_CACHE_DIR' test-linuxcnc-wasm-blockers.sh >/dev/null
+grep -F 'cache_dir=${CNC_SIM_WASM_BLOCKERS_CACHE_DIR-${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/wasm-blocker-cache}}' test-linuxcnc-wasm-blockers.sh >/dev/null
+grep -F 'CNC_SIM_WASM_BLOCKERS_CACHE_DIR must not be empty' test-linuxcnc-wasm-blockers.sh >/dev/null
+grep -F 'CNC_SIM_WASM_BLOCKERS_CACHE_DIR must not contain whitespace: $cache_dir' test-linuxcnc-wasm-blockers.sh >/dev/null
+grep -F 'CNC_SIM_WASM_BLOCKERS_CACHE_DIR must not be the filesystem root' test-linuxcnc-wasm-blockers.sh >/dev/null
+grep -F 'exec 8>"$cache_dir/wasm-blockers.lock"' test-linuxcnc-wasm-blockers.sh >/dev/null
+grep -F 'stat -c '\''SOURCE=%n:%s:%y'\''' test-linuxcnc-wasm-blockers.sh >/dev/null
+grep -F 'sha256sum analyze-linuxcnc-wasm-blockers.sh' test-linuxcnc-wasm-blockers.sh >/dev/null
+if CNC_SIM_WASM_BLOCKERS_CACHE_DIR= ./test-linuxcnc-wasm-blockers.sh "$manifest" >"$wasm_blockers_cache_log" 2>&1; then
+    echo "wasm blocker cache accepted an empty cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_BLOCKERS_CACHE_DIR must not be empty' "$wasm_blockers_cache_log" >/dev/null
+if CNC_SIM_WASM_BLOCKERS_CACHE_DIR='build/wasm blocker cache' ./test-linuxcnc-wasm-blockers.sh "$manifest" >"$wasm_blockers_cache_log" 2>&1; then
+    echo "wasm blocker cache accepted a whitespace-containing cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_BLOCKERS_CACHE_DIR must not contain whitespace: build/wasm blocker cache' "$wasm_blockers_cache_log" >/dev/null
+if CNC_SIM_WASM_BLOCKERS_CACHE_DIR=/ ./test-linuxcnc-wasm-blockers.sh "$manifest" >"$wasm_blockers_cache_log" 2>&1; then
+    echo "wasm blocker cache accepted the filesystem root as its cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_BLOCKERS_CACHE_DIR must not be the filesystem root' "$wasm_blockers_cache_log" >/dev/null
 grep -F -- './test-linuxcnc-wasm-source-syntax.sh "$manifest"' build-wasm.sh >/dev/null
+grep -F -- 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-source-syntax.sh "$manifest"' build-wasm.sh >/dev/null
 grep -F -- './test-linuxcnc-wasm-source-objects.sh "$manifest"' build-wasm.sh >/dev/null
+grep -F -- 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-source-objects.sh "$manifest"' build-wasm.sh >/dev/null
 grep -F -- './test-linuxcnc-wasm-cmake-safe-probe.sh "$manifest"' build-wasm.sh >/dev/null
 grep -F -- './test-linuxcnc-wasm-tooldata-link.sh' build-wasm.sh >/dev/null
 grep -F -- './test-linuxcnc-wasm-tooldata-common-link.sh' build-wasm.sh >/dev/null
@@ -183,9 +247,284 @@ grep -F -- './test-linuxcnc-wasm-interp-find-link.sh' build-wasm.sh >/dev/null
 grep -F -- './test-linuxcnc-wasm-python-plugin-link.sh' build-wasm.sh >/dev/null
 grep -F -- './test-linuxcnc-wasm-python-c-api-symbols.sh' build-wasm.sh >/dev/null
 grep -F -- './test-linuxcnc-wasm-rs274ngc-pre-object.sh' build-wasm.sh >/dev/null
-grep -F -- './test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh "$manifest"' build-wasm.sh >/dev/null
-grep -F -- './test-linuxcnc-wasm-rs274ngc-pre-link.sh "$manifest"' build-wasm.sh >/dev/null
-grep -F -- './test-linuxcnc-wasm-runtime-link.sh "$manifest"' build-wasm.sh >/dev/null
+grep -F -- 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh "$manifest"' build-wasm.sh >/dev/null
+grep -F -- 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-rs274ngc-pre-link.sh "$manifest"' build-wasm.sh >/dev/null
+grep -F -- 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./test-linuxcnc-wasm-runtime-link.sh "$manifest"' build-wasm.sh >/dev/null
+test -x build-linuxcnc-wasm-probe-objects.sh
+grep -F 'CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR' build-linuxcnc-wasm-probe-objects.sh >/dev/null
+grep -F 'cache_dir=${CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR-build/wasm-probe-object-cache}' build-linuxcnc-wasm-probe-objects.sh >/dev/null
+grep -F 'CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR must not be empty' build-linuxcnc-wasm-probe-objects.sh >/dev/null
+grep -F 'CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR must not contain whitespace: $cache_dir' build-linuxcnc-wasm-probe-objects.sh >/dev/null
+grep -F 'CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR must not be the filesystem root' build-linuxcnc-wasm-probe-objects.sh >/dev/null
+grep -F 'source-objects|rs274ngc-pre|runtime' build-linuxcnc-wasm-probe-objects.sh >/dev/null
+grep -F 'wasm probe object source list contains an empty path' build-linuxcnc-wasm-probe-objects.sh >/dev/null
+grep -F 'list-cmake-set-sources.sh cnc_sim_core_sources core/' list-linuxcnc-wasm-safe-project-sources.sh >/dev/null
+grep -F 'list-cmake-set-sources.sh cnc_sim_linuxcnc_rs274_backend_sources core/' list-linuxcnc-wasm-safe-project-sources.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-probe-objects.sh --mode source-objects "$manifest"' test-linuxcnc-wasm-source-objects.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-probe-objects.sh --mode rs274ngc-pre "$manifest"' test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-link-probe.sh --mode rs274ngc-pre "$manifest"' test-linuxcnc-wasm-rs274ngc-pre-link.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-link-probe.sh --mode runtime "$manifest"' test-linuxcnc-wasm-runtime-link.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null' build-linuxcnc-wasm-probe-objects.sh >/dev/null
+grep -F 'source_${object_index}.o' build-linuxcnc-wasm-probe-objects.sh >/dev/null
+grep -F 'DEP_FILES += %s.d' build-linuxcnc-wasm-probe-objects.sh >/dev/null
+grep -F -- '-MMD -MP -MF %s.d' build-linuxcnc-wasm-probe-objects.sh >/dev/null
+if CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR= ./build-linuxcnc-wasm-probe-objects.sh --mode source-objects "$manifest" >"$wasm_probe_object_cache_log" 2>&1; then
+    echo "wasm probe object cache accepted an empty cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR must not be empty' "$wasm_probe_object_cache_log" >/dev/null
+if CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR='build/wasm probe object cache' ./build-linuxcnc-wasm-probe-objects.sh --mode source-objects "$manifest" >"$wasm_probe_object_cache_log" 2>&1; then
+    echo "wasm probe object cache accepted a whitespace-containing cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR must not contain whitespace: build/wasm probe object cache' "$wasm_probe_object_cache_log" >/dev/null
+if CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR=/ ./build-linuxcnc-wasm-probe-objects.sh --mode source-objects "$manifest" >"$wasm_probe_object_cache_log" 2>&1; then
+    echo "wasm probe object cache accepted the filesystem root as its cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_PROBE_OBJECT_CACHE_DIR must not be the filesystem root' "$wasm_probe_object_cache_log" >/dev/null
+test -x build-linuxcnc-wasm-standalone-probe.sh
+grep -F 'CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'cache_dir=${CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR-build/wasm-standalone-probe-cache}' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR must not be empty' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR must not contain whitespace: $cache_dir' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR must not be the filesystem root' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'tooldata-link|tooldata-common-link|interp-base-link|python-plugin-link|rs274ngc-pre-object' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'exec 8>"$mode_dir/probe.lock"' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'DEP_FILES += %s.d' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null' build-linuxcnc-wasm-standalone-probe.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-standalone-probe.sh --mode tooldata-link' test-linuxcnc-wasm-tooldata-link.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-standalone-probe.sh --mode tooldata-common-link' test-linuxcnc-wasm-tooldata-common-link.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-standalone-probe.sh --mode interp-base-link' test-linuxcnc-wasm-interp-base-link.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-standalone-probe.sh --mode python-plugin-link' test-linuxcnc-wasm-python-plugin-link.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-standalone-probe.sh --mode rs274ngc-pre-object' test-linuxcnc-wasm-rs274ngc-pre-object.sh >/dev/null
+if CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR= ./build-linuxcnc-wasm-standalone-probe.sh --mode python-plugin-link >"$wasm_standalone_probe_cache_log" 2>&1; then
+    echo "wasm standalone probe cache accepted an empty cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR must not be empty' "$wasm_standalone_probe_cache_log" >/dev/null
+if CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR='build/wasm standalone probe cache' ./build-linuxcnc-wasm-standalone-probe.sh --mode python-plugin-link >"$wasm_standalone_probe_cache_log" 2>&1; then
+    echo "wasm standalone probe cache accepted a whitespace-containing cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR must not contain whitespace: build/wasm standalone probe cache' "$wasm_standalone_probe_cache_log" >/dev/null
+if CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR=/ ./build-linuxcnc-wasm-standalone-probe.sh --mode python-plugin-link >"$wasm_standalone_probe_cache_log" 2>&1; then
+    echo "wasm standalone probe cache accepted the filesystem root as its cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_STANDALONE_PROBE_CACHE_DIR must not be the filesystem root' "$wasm_standalone_probe_cache_log" >/dev/null
+if CNC_SIM_BUILD_JOBS=0 ./build-linuxcnc-wasm-standalone-probe.sh --mode python-plugin-link >"$wasm_standalone_probe_cache_log" 2>&1; then
+    echo "wasm standalone probe cache accepted invalid CNC_SIM_BUILD_JOBS" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: 0' "$wasm_standalone_probe_cache_log" >/dev/null
+test -x build-linuxcnc-wasm-link-probe.sh
+grep -F 'CNC_SIM_WASM_LINK_PROBE_CACHE_DIR' build-linuxcnc-wasm-link-probe.sh >/dev/null
+grep -F 'cache_dir=${CNC_SIM_WASM_LINK_PROBE_CACHE_DIR-build/wasm-link-probe-cache}' build-linuxcnc-wasm-link-probe.sh >/dev/null
+grep -F 'CNC_SIM_WASM_LINK_PROBE_CACHE_DIR must not be empty' build-linuxcnc-wasm-link-probe.sh >/dev/null
+grep -F 'CNC_SIM_WASM_LINK_PROBE_CACHE_DIR must not contain whitespace: $cache_dir' build-linuxcnc-wasm-link-probe.sh >/dev/null
+grep -F 'CNC_SIM_WASM_LINK_PROBE_CACHE_DIR must not be the filesystem root' build-linuxcnc-wasm-link-probe.sh >/dev/null
+grep -F 'rs274ngc-pre|runtime' build-linuxcnc-wasm-link-probe.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-probe-objects.sh --mode "$object_mode" "$manifest"' build-linuxcnc-wasm-link-probe.sh >/dev/null
+grep -F 'exec 8>"$mode_dir/link.lock"' build-linuxcnc-wasm-link-probe.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null' build-linuxcnc-wasm-link-probe.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-link-probe.sh --mode rs274ngc-pre "$manifest"' test-linuxcnc-wasm-rs274ngc-pre-link.sh >/dev/null
+grep -F 'build-linuxcnc-wasm-link-probe.sh --mode runtime "$manifest"' test-linuxcnc-wasm-runtime-link.sh >/dev/null
+grep -F 'symbol_signature="$probe_dir/runtime.symbols.signature"' test-linuxcnc-wasm-runtime-link.sh >/dev/null
+grep -F "printf 'SYMBOL_RULE_VERSION=1\n'" test-linuxcnc-wasm-runtime-link.sh >/dev/null
+grep -F "stat -c 'PROBE_STAT=%n:%s:%y' \"\$probe\"" test-linuxcnc-wasm-runtime-link.sh >/dev/null
+grep -F 'nm -C "$probe" > "$symbol_file"' test-linuxcnc-wasm-runtime-link.sh >/dev/null
+if CNC_SIM_WASM_LINK_PROBE_CACHE_DIR= ./build-linuxcnc-wasm-link-probe.sh --mode runtime "$manifest" >"$wasm_link_probe_cache_log" 2>&1; then
+    echo "wasm link probe cache accepted an empty cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_LINK_PROBE_CACHE_DIR must not be empty' "$wasm_link_probe_cache_log" >/dev/null
+if CNC_SIM_WASM_LINK_PROBE_CACHE_DIR='build/wasm link probe cache' ./build-linuxcnc-wasm-link-probe.sh --mode runtime "$manifest" >"$wasm_link_probe_cache_log" 2>&1; then
+    echo "wasm link probe cache accepted a whitespace-containing cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_LINK_PROBE_CACHE_DIR must not contain whitespace: build/wasm link probe cache' "$wasm_link_probe_cache_log" >/dev/null
+if CNC_SIM_WASM_LINK_PROBE_CACHE_DIR=/ ./build-linuxcnc-wasm-link-probe.sh --mode runtime "$manifest" >"$wasm_link_probe_cache_log" 2>&1; then
+    echo "wasm link probe cache accepted the filesystem root as its cache directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_LINK_PROBE_CACHE_DIR must not be the filesystem root' "$wasm_link_probe_cache_log" >/dev/null
+if CNC_SIM_BUILD_JOBS=0 ./build-linuxcnc-wasm-link-probe.sh --mode runtime "$manifest" >"$wasm_link_probe_cache_log" 2>&1; then
+    echo "wasm link probe cache accepted invalid CNC_SIM_BUILD_JOBS" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: 0' "$wasm_link_probe_cache_log" >/dev/null
+grep -F 'build_dir=${CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR-build/wasm-source-syntax-test}' test-linuxcnc-wasm-source-syntax.sh >/dev/null
+grep -F 'CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR must not be empty' test-linuxcnc-wasm-source-syntax.sh >/dev/null
+grep -F 'CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR must not contain whitespace: $build_dir' test-linuxcnc-wasm-source-syntax.sh >/dev/null
+grep -F 'CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR must not be the filesystem root' test-linuxcnc-wasm-source-syntax.sh >/dev/null
+grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' test-linuxcnc-wasm-source-syntax.sh >/dev/null
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-wasm-source-syntax.sh >/dev/null
+grep -F 'command -v ccache >/dev/null 2>&1' test-linuxcnc-wasm-source-syntax.sh >/dev/null
+grep -F 'check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir"' test-linuxcnc-wasm-source-syntax.sh >/dev/null
+grep -F 'wasm_source_syntax_signature="$build_dir/wasm-source-syntax.signature"' test-linuxcnc-wasm-source-syntax.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-linuxcnc-wasm-source-syntax.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$wasm_source_syntax_makefile"' test-linuxcnc-wasm-source-syntax.sh >/dev/null
+grep -F -- '-MMD -MP -MF %s/source_%s.d' test-linuxcnc-wasm-source-syntax.sh >/dev/null
+if CNC_SIM_BUILD_JOBS=0 ./test-linuxcnc-wasm-source-syntax.sh "$manifest" >"$wasm_source_syntax_build_dir_log" 2>&1; then
+    echo "wasm source syntax probe accepted invalid CNC_SIM_BUILD_JOBS" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: 0' "$wasm_source_syntax_build_dir_log" >/dev/null
+if CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR= ./test-linuxcnc-wasm-source-syntax.sh "$manifest" >"$wasm_source_syntax_build_dir_log" 2>&1; then
+    echo "wasm source syntax probe accepted an empty build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR must not be empty' "$wasm_source_syntax_build_dir_log" >/dev/null
+if CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR='build/wasm source syntax test' ./test-linuxcnc-wasm-source-syntax.sh "$manifest" >"$wasm_source_syntax_build_dir_log" 2>&1; then
+    echo "wasm source syntax probe accepted a whitespace-containing build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR must not contain whitespace: build/wasm source syntax test' "$wasm_source_syntax_build_dir_log" >/dev/null
+if CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR=/ ./test-linuxcnc-wasm-source-syntax.sh "$manifest" >"$wasm_source_syntax_build_dir_log" 2>&1; then
+    echo "wasm source syntax probe accepted the filesystem root as its build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR must not be the filesystem root' "$wasm_source_syntax_build_dir_log" >/dev/null
+grep -F 'build_dir=${CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR-build/wasm-python-c-api-symbols}' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F 'CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR must not be empty' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F 'CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR must not contain whitespace: $build_dir' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F 'CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR must not be the filesystem root' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F 'command -v ccache >/dev/null 2>&1' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F 'check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F 'signature="$build_dir/python-c-api.signature"' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F 'source_symbols_signature="$build_dir/python-c-api.source-symbols.signature"' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F "printf 'SOURCE_SYMBOL_RULE_VERSION=1\n'" test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F 'object_symbols_signature="$build_dir/python-c-api.object-symbols.signature"' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F "printf 'OBJECT_SYMBOL_RULE_VERSION=1\n'" test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+grep -F -- '-MMD -MP -MF %s.d' test-linuxcnc-wasm-python-c-api-symbols.sh >/dev/null
+if CNC_SIM_BUILD_JOBS=0 ./test-linuxcnc-wasm-python-c-api-symbols.sh >"$wasm_python_c_api_build_dir_log" 2>&1; then
+    echo "wasm Python C API probe accepted invalid CNC_SIM_BUILD_JOBS" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: 0' "$wasm_python_c_api_build_dir_log" >/dev/null
+if CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR= ./test-linuxcnc-wasm-python-c-api-symbols.sh >"$wasm_python_c_api_build_dir_log" 2>&1; then
+    echo "wasm Python C API probe accepted an empty build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR must not be empty' "$wasm_python_c_api_build_dir_log" >/dev/null
+if CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR='build/wasm python c api' ./test-linuxcnc-wasm-python-c-api-symbols.sh >"$wasm_python_c_api_build_dir_log" 2>&1; then
+    echo "wasm Python C API probe accepted a whitespace-containing build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR must not contain whitespace: build/wasm python c api' "$wasm_python_c_api_build_dir_log" >/dev/null
+if CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR=/ ./test-linuxcnc-wasm-python-c-api-symbols.sh >"$wasm_python_c_api_build_dir_log" 2>&1; then
+    echo "wasm Python C API probe accepted the filesystem root as its build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR must not be the filesystem root' "$wasm_python_c_api_build_dir_log" >/dev/null
+grep -F 'build_dir=${CNC_SIM_WASM_INTERP_FIND_BUILD_DIR-build/wasm-interp-find-link}' test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+grep -F 'CNC_SIM_WASM_INTERP_FIND_BUILD_DIR must not be empty' test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+grep -F 'CNC_SIM_WASM_INTERP_FIND_BUILD_DIR must not contain whitespace: $build_dir' test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+grep -F 'CNC_SIM_WASM_INTERP_FIND_BUILD_DIR must not be the filesystem root' test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+grep -F 'command -v ccache >/dev/null 2>&1' test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+grep -F 'check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only' test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+grep -F 'signature="$build_dir/interp-find.signature"' test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null' test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+grep -F -- '-MMD -MP -MF %s.d' test-linuxcnc-wasm-interp-find-link.sh >/dev/null
+if CNC_SIM_BUILD_JOBS=0 ./test-linuxcnc-wasm-interp-find-link.sh >"$wasm_interp_find_build_dir_log" 2>&1; then
+    echo "wasm interp_find probe accepted invalid CNC_SIM_BUILD_JOBS" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: 0' "$wasm_interp_find_build_dir_log" >/dev/null
+if CNC_SIM_WASM_INTERP_FIND_BUILD_DIR= ./test-linuxcnc-wasm-interp-find-link.sh >"$wasm_interp_find_build_dir_log" 2>&1; then
+    echo "wasm interp_find probe accepted an empty build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_INTERP_FIND_BUILD_DIR must not be empty' "$wasm_interp_find_build_dir_log" >/dev/null
+if CNC_SIM_WASM_INTERP_FIND_BUILD_DIR='build/wasm interp find' ./test-linuxcnc-wasm-interp-find-link.sh >"$wasm_interp_find_build_dir_log" 2>&1; then
+    echo "wasm interp_find probe accepted a whitespace-containing build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_INTERP_FIND_BUILD_DIR must not contain whitespace: build/wasm interp find' "$wasm_interp_find_build_dir_log" >/dev/null
+if CNC_SIM_WASM_INTERP_FIND_BUILD_DIR=/ ./test-linuxcnc-wasm-interp-find-link.sh >"$wasm_interp_find_build_dir_log" 2>&1; then
+    echo "wasm interp_find probe accepted the filesystem root as its build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_INTERP_FIND_BUILD_DIR must not be the filesystem root' "$wasm_interp_find_build_dir_log" >/dev/null
+grep -F 'build_dir=${CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR-build/wasm-tooldata-mmap-symbols}' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F 'CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR must not be empty' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F 'CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR must not contain whitespace: $build_dir' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F 'CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR must not be the filesystem root' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F 'command -v ccache >/dev/null 2>&1' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F 'check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F 'signature="$build_dir/tooldata-mmap-symbols.signature"' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F 'symbols_signature="$build_dir/tooldata-mmap-symbols.nm.signature"' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F "printf 'SYMBOL_RULE_VERSION=1\n'" test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+grep -F -- '-MMD -MP -MF %s.d' test-linuxcnc-wasm-tooldata-mmap-symbols.sh >/dev/null
+if CNC_SIM_BUILD_JOBS=0 ./test-linuxcnc-wasm-tooldata-mmap-symbols.sh >"$wasm_tooldata_mmap_build_dir_log" 2>&1; then
+    echo "wasm tooldata_mmap symbol probe accepted invalid CNC_SIM_BUILD_JOBS" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: 0' "$wasm_tooldata_mmap_build_dir_log" >/dev/null
+if CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR= ./test-linuxcnc-wasm-tooldata-mmap-symbols.sh >"$wasm_tooldata_mmap_build_dir_log" 2>&1; then
+    echo "wasm tooldata_mmap symbol probe accepted an empty build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR must not be empty' "$wasm_tooldata_mmap_build_dir_log" >/dev/null
+if CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR='build/wasm tooldata mmap' ./test-linuxcnc-wasm-tooldata-mmap-symbols.sh >"$wasm_tooldata_mmap_build_dir_log" 2>&1; then
+    echo "wasm tooldata_mmap symbol probe accepted a whitespace-containing build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR must not contain whitespace: build/wasm tooldata mmap' "$wasm_tooldata_mmap_build_dir_log" >/dev/null
+if CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR=/ ./test-linuxcnc-wasm-tooldata-mmap-symbols.sh >"$wasm_tooldata_mmap_build_dir_log" 2>&1; then
+    echo "wasm tooldata_mmap symbol probe accepted the filesystem root as its build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR must not be the filesystem root' "$wasm_tooldata_mmap_build_dir_log" >/dev/null
+grep -F 'build_dir=${CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR-build/wasm-tooldata-runtime-symbols}' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F 'CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR must not be empty' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F 'CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR must not contain whitespace: $build_dir' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F 'CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR must not be the filesystem root' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F 'command -v ccache >/dev/null 2>&1' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F 'check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F 'signature="$build_dir/tooldata-runtime-symbols.signature"' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F "printf 'BUILD_RULE_VERSION=1\n'" test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F 'symbols_signature="$build_dir/tooldata-runtime-symbols.nm.signature"' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F "printf 'SYMBOL_RULE_VERSION=1\n'" test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F 'make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+grep -F -- '-MMD -MP -MF %s.d' test-linuxcnc-wasm-tooldata-runtime-symbols.sh >/dev/null
+if CNC_SIM_BUILD_JOBS=0 ./test-linuxcnc-wasm-tooldata-runtime-symbols.sh >"$wasm_tooldata_runtime_build_dir_log" 2>&1; then
+    echo "wasm tooldata runtime symbol probe accepted invalid CNC_SIM_BUILD_JOBS" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: 0' "$wasm_tooldata_runtime_build_dir_log" >/dev/null
+if CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR= ./test-linuxcnc-wasm-tooldata-runtime-symbols.sh >"$wasm_tooldata_runtime_build_dir_log" 2>&1; then
+    echo "wasm tooldata runtime symbol probe accepted an empty build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR must not be empty' "$wasm_tooldata_runtime_build_dir_log" >/dev/null
+if CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR='build/wasm tooldata runtime' ./test-linuxcnc-wasm-tooldata-runtime-symbols.sh >"$wasm_tooldata_runtime_build_dir_log" 2>&1; then
+    echo "wasm tooldata runtime symbol probe accepted a whitespace-containing build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR must not contain whitespace: build/wasm tooldata runtime' "$wasm_tooldata_runtime_build_dir_log" >/dev/null
+if CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR=/ ./test-linuxcnc-wasm-tooldata-runtime-symbols.sh >"$wasm_tooldata_runtime_build_dir_log" 2>&1; then
+    echo "wasm tooldata runtime symbol probe accepted the filesystem root as its build directory" >&2
+    exit 1
+fi
+grep -F 'CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR must not be the filesystem root' "$wasm_tooldata_runtime_build_dir_log" >/dev/null
 if grep -F '} > "$report_file" || true' test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh >/dev/null; then
     echo "rs274ngc_pre blocker scan still hides report pipeline failures with || true" >&2
     exit 1
@@ -203,37 +542,34 @@ if ! awk '
     exit 1
 fi
 if ! awk '
-    index($0, "LINUXCNC_ROOT=\"$linuxcnc_root\" ./check-linuxcnc-inputs.sh \"$manifest\"") { check_line = NR }
-    index($0, "report_file=$(mktemp ") { report_line = NR }
+    index($0, "check-linuxcnc-inputs-cached.sh --cache-dir \"$preflight_cache_dir\" \"$manifest\"") { check_line = NR }
+    index($0, "cache_dir=${CNC_SIM_WASM_RS274NGC_PRE_LINK_BLOCKERS_CACHE_DIR-build/wasm-rs274ngc-pre-link-blockers}") { report_line = NR }
     END { exit !(check_line && report_line && check_line < report_line) }
 ' test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh; then
-    echo "rs274ngc_pre blocker scan creates its report before input validation" >&2
+    echo "rs274ngc_pre blocker scan prepares its report cache before input validation" >&2
     exit 1
 fi
+grep -F 'CNC_SIM_WASM_RS274NGC_PRE_LINK_BLOCKERS_CACHE_DIR' test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh >/dev/null
+grep -F 'rs274ngc-pre-link-blockers.lock' test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh >/dev/null
+grep -F "printf 'FILTER_RULE_VERSION=1\n'" test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh >/dev/null
+grep -F "stat -c 'OBJECT=%n:%s:%y'" test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh >/dev/null
+grep -F 'cmp -s "$signature" "$next_signature"' test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh >/dev/null
 for build_dir_probe_script in \
-    test-linuxcnc-wasm-interp-base-link.sh \
-    test-linuxcnc-wasm-interp-find-link.sh \
-    test-linuxcnc-wasm-python-c-api-symbols.sh \
-    test-linuxcnc-wasm-python-plugin-link.sh \
-    test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh \
-    test-linuxcnc-wasm-rs274ngc-pre-link.sh \
-    test-linuxcnc-wasm-runtime-link.sh \
-    test-linuxcnc-wasm-rs274ngc-pre-object.sh \
-    test-linuxcnc-wasm-source-objects.sh \
-    test-linuxcnc-wasm-tooldata-common-link.sh \
-    test-linuxcnc-wasm-tooldata-link.sh \
-    test-linuxcnc-wasm-tooldata-mmap-symbols.sh \
-    test-linuxcnc-wasm-tooldata-runtime-symbols.sh; do
+    test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh; do
     if ! awk '
         $0 ~ /^trap .* EXIT$/ { trap_line = NR }
-        index($0, "./check-linuxcnc-inputs.sh") && !check_line { check_line = NR }
+        (index($0, "./check-linuxcnc-inputs.sh") ||
+            index($0, "./check-linuxcnc-inputs-cached.sh") ||
+            index($0, "./build-linuxcnc-wasm-probe-objects.sh")) && !check_line { check_line = NR }
         END { exit !(trap_line && check_line && trap_line < check_line) }
     ' "$build_dir_probe_script"; then
-        echo "$build_dir_probe_script installs build_dir cleanup after input validation" >&2
+        echo "$build_dir_probe_script installs build_dir cleanup after failure-prone input setup" >&2
         exit 1
     fi
 done
 grep -F 'trap '\''rm -f "$missing_manifest" "$missing_manifest_log" "$missing_root_log" "$missing_source_manifest" "$missing_source_log" "$duplicate_manifest" "$duplicate_manifest_log" "$missing_replacement_manifest" "$missing_replacement_log"'\'' EXIT' test-linuxcnc-wasm-blockers.sh >/dev/null
+grep -F 'self_checks=${CNC_SIM_WASM_BLOCKERS_SELF_CHECKS:-0}' test-linuxcnc-wasm-blockers.sh >/dev/null
+grep -F 'CNC_SIM_WASM_BLOCKERS_SELF_CHECKS must be 0 or 1: $self_checks' test-linuxcnc-wasm-blockers.sh >/dev/null
 if grep -F 'rm -f "$missing_source_manifest" "$missing_source_log"' test-linuxcnc-wasm-blockers.sh >/dev/null; then
     echo "wasm blocker scan still relies on manual cleanup for missing-source temporaries" >&2
     exit 1
@@ -287,6 +623,8 @@ if grep -RInF "${forbidden_common_flags_process_substitution}LINUXCNC_ROOT=\"\$l
     grep -RInF "${forbidden_common_flags_process_substitution}LINUXCNC_ROOT=\"\$linuxcnc_root\" ${forbidden_common_flags_helper}" test-linuxcnc-wasm-*.sh >&2
     exit 1
 fi
+grep -F 'preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/linuxcnc-helper-preflight-cache}' list-linuxcnc-wasm-common-cxxflags.sh >/dev/null
+grep -F 'check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only' list-linuxcnc-wasm-common-cxxflags.sh >/dev/null
 grep -F -- '-DCNC_SIM_LINUXCNC_WASM_SOURCE_MANIFEST="$manifest"' build-wasm.sh >/dev/null
 grep -F -- 'for required_tool in cmake emcmake emcc node; do' build-wasm.sh >/dev/null
 grep -F -- 'missing_tools+=("$required_tool")' build-wasm.sh >/dev/null
@@ -294,6 +632,31 @@ grep -F "WASM build tools are required. Missing:" build-wasm.sh >/dev/null
 grep -F "Install/activate cmake, emsdk, and Node.js so cmake, emcmake, emcc, and node are in PATH." build-wasm.sh >/dev/null
 grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' build-wasm.sh >/dev/null
 grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' build-wasm.sh >/dev/null
+grep -F 'cmake_compiler_launcher_mode=none' build-wasm.sh >/dev/null
+grep -F 'cmake_compiler_launcher_mode=ccache' build-wasm.sh >/dev/null
+grep -F 'wasm_build_signature=build/wasm/wasm-build.signature' build-wasm.sh >/dev/null
+grep -F 'wasm_build_next_signature=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_build.signature.XXXXXX")' build-wasm.sh >/dev/null
+grep -F 'sha256sum "$manifest"' build-wasm.sh >/dev/null
+grep -F 'sha256sum core/CMakeLists.txt' build-wasm.sh >/dev/null
+grep -F "printf 'CONFIGURE_RULE_VERSION=1\n'" build-wasm.sh >/dev/null
+grep -F 'run_parallel_wasm_probe() {' build-wasm.sh >/dev/null
+grep -F 'wait_parallel_wasm_probes() {' build-wasm.sh >/dev/null
+grep -F 'parallel_probe_pids+=("$!")' build-wasm.sh >/dev/null
+grep -F 'CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" "$@"' build-wasm.sh >/dev/null
+grep -F 'run_parallel_wasm_probe "LinuxCNC wasm tooldata shim link probe" ./test-linuxcnc-wasm-tooldata-link.sh' build-wasm.sh >/dev/null
+grep -F 'run_parallel_wasm_probe "LinuxCNC wasm rs274ngc_pre object probe" ./test-linuxcnc-wasm-rs274ngc-pre-object.sh' build-wasm.sh >/dev/null
+grep -F 'wait_parallel_wasm_probes' build-wasm.sh >/dev/null
+grep -F 'configure_wasm=1' build-wasm.sh >/dev/null
+grep -F 'elif [[ -f build/wasm/CMakeCache.txt ]]; then' build-wasm.sh >/dev/null
+grep -F 'configure_wasm=0' build-wasm.sh >/dev/null
+if grep -F 'rm -rf build/wasm' build-wasm.sh >/dev/null; then
+    echo "build-wasm configure signature changes must reconfigure build/wasm in place" >&2
+    exit 1
+fi
+if grep -F 'printf '\''BUILD_JOBS=%s\n'\'' "$build_jobs"' build-wasm.sh >/dev/null; then
+    echo "build-wasm configure signature must not depend on CNC_SIM_BUILD_JOBS" >&2
+    exit 1
+fi
 grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'build_dir=${CNC_SIM_WASM_CMAKE_SAFE_PROBE_BUILD_DIR-build/wasm-cmake-safe-probe}' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
@@ -305,7 +668,51 @@ grep -F 'build_next_signature=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_wasm_cmake_safe_
 grep -F 'if [[ ! -f "$build_signature" ]] || ! cmp -s "$build_signature" "$build_next_signature"; then' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'printf '\''LINUXCNC_ROOT=%s\n'\'' "$linuxcnc_root"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F 'printf '\''MANIFEST=%s\n'\'' "$manifest"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
-grep -F 'printf '\''BUILD_JOBS=%s\n'\'' "$build_jobs"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'sha256sum "$manifest"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F "printf 'CONFIGURE_RULE_VERSION=1\n'" test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+if awk '
+    BEGIN { forbidden = "rm -rf " "\"$build_dir\"" }
+    $0 ~ "^[[:space:]]*" forbidden { found = 1 }
+    END { exit !found }
+' test-linuxcnc-wasm-cmake-safe-probe.sh; then
+    echo "wasm CMake probe signature changes must reconfigure build_dir in place" >&2
+    exit 1
+fi
+for signature_script in \
+    build-wasm.sh \
+    build-linuxcnc-wasm-probe-objects.sh \
+    build-linuxcnc-wasm-link-probe.sh \
+    build-linuxcnc-wasm-standalone-probe.sh \
+    test-linuxcnc-source-syntax.sh \
+    test-linuxcnc-wasm-cmake-safe-probe.sh \
+    test-linuxcnc-wasm-interp-find-link.sh \
+    test-linuxcnc-wasm-python-c-api-symbols.sh \
+    test-linuxcnc-wasm-source-syntax.sh \
+    test-linuxcnc-wasm-tooldata-mmap-symbols.sh \
+    test-linuxcnc-wasm-tooldata-runtime-symbols.sh; do
+    if grep -F 'printf '\''BUILD_JOBS=%s\n'\'' "$build_jobs"' "$signature_script" >/dev/null; then
+        echo "$signature_script signature must not depend on CNC_SIM_BUILD_JOBS" >&2
+        exit 1
+    fi
+done
+for hot_signature_script in \
+    build-linuxcnc-wasm-link-probe.sh \
+    build-linuxcnc-wasm-probe-objects.sh \
+    build-linuxcnc-wasm-standalone-probe.sh \
+    test-linuxcnc-wasm-interp-find-link.sh \
+    test-linuxcnc-wasm-python-c-api-symbols.sh \
+    test-linuxcnc-wasm-source-syntax.sh \
+    test-linuxcnc-wasm-tooldata-mmap-symbols.sh \
+    test-linuxcnc-wasm-tooldata-runtime-symbols.sh; do
+    if grep -F "sha256sum $hot_signature_script" "$hot_signature_script" >/dev/null; then
+        echo "$hot_signature_script hot object signature must use BUILD_RULE_VERSION instead of the whole script hash" >&2
+        exit 1
+    fi
+done
+if grep -F 'sha256sum build-wasm.sh' build-wasm.sh >/dev/null; then
+    echo "build-wasm configure signature must use CONFIGURE_RULE_VERSION instead of the whole script hash" >&2
+    exit 1
+fi
 grep -F 'build_jobs=${CNC_SIM_BUILD_JOBS:-8}' test-native.sh >/dev/null
 grep -F 'CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs' test-native.sh >/dev/null
 grep -F 'build_dir=${CNC_SIM_NATIVE_BUILD_DIR-build/native-test}' test-native.sh >/dev/null
@@ -331,11 +738,8 @@ grep -F 'printf '\''\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n'
 grep -F 'printf '\''\n-include $(DEP_FILES)\n'\''' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'make --output-sync=target -j"$build_jobs" -f "$source_link_makefile"' test-linuxcnc-source-link.sh >/dev/null
 grep -F -- 'emcmake cmake -S core -B build/wasm \' build-wasm.sh >/dev/null
-grep -F -- 'cmake --build build/wasm --target cnc_sim_wasm_runtime_probe --parallel "$build_jobs"' build-wasm.sh >/dev/null
-grep -F -- 'cmake --build build/wasm --target cnc_sim_wasm --parallel "$build_jobs"' build-wasm.sh >/dev/null
-grep -F -- 'cmake --build "$build_dir" --target linuxcnc_rs274_wasm_safe_probe_objects --parallel "$build_jobs"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
-grep -F -- 'cmake --build "$build_dir" --target linuxcnc_rs274_wasm_safe_probe --parallel "$build_jobs"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
-grep -F -- 'cmake --build "$build_dir" --target cnc_sim_wasm_runtime_probe --parallel "$build_jobs"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F -- 'cmake --build build/wasm --target cnc_sim_wasm_runtime_probe cnc_sim_wasm --parallel "$build_jobs"' build-wasm.sh >/dev/null
+grep -F -- 'cmake --build "$build_dir" --target linuxcnc_rs274_wasm_safe_probe cnc_sim_wasm_runtime_probe --parallel "$build_jobs"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 grep -F -- 'mkdir -p web/public' build-wasm.sh >/dev/null
 grep -F -- 'cp build/wasm/cnc_sim.js web/public/cnc_sim.js' build-wasm.sh >/dev/null
 grep -F -- 'cp build/wasm/cnc_sim.wasm web/public/cnc_sim.wasm' build-wasm.sh >/dev/null
@@ -394,6 +798,15 @@ if ! awk '
     echo "build-wasm must create web/public before copying wasm artifacts" >&2
     exit 1
 fi
+if ! awk '
+    index($0, "run_parallel_wasm_probe \"LinuxCNC wasm tooldata shim link probe\"") { parallel_start_line = NR }
+    index($0, "wait_parallel_wasm_probes") && parallel_start_line { wait_line = NR }
+    index($0, "LinuxCNC wasm rs274ngc_pre link blocker scan") { pre_link_line = NR }
+    END { exit !(parallel_start_line && wait_line && pre_link_line && parallel_start_line < wait_line && wait_line < pre_link_line) }
+' build-wasm.sh; then
+    echo "build-wasm must wait for independent wasm probes before rs274ngc_pre link checks" >&2
+    exit 1
+fi
 if ! awk '
     index($0, "cp build/wasm/cnc_sim.js web/public/cnc_sim.js") { cp_js_line = NR }
     index($0, "cp build/wasm/cnc_sim.wasm web/public/cnc_sim.wasm") { cp_wasm_line = NR }
@@ -412,27 +825,28 @@ if ! awk '
     exit 1
 fi
 if ! awk '
-    index($0, "cmake --build build/wasm --target cnc_sim_wasm_runtime_probe --parallel \"$build_jobs\"") { runtime_probe_line = NR }
-    index($0, "cmake --build build/wasm --target cnc_sim_wasm --parallel \"$build_jobs\"") &&
-        !index($0, "cnc_sim_wasm_runtime_probe") { wasm_line = NR }
-    END { exit !(runtime_probe_line && wasm_line && runtime_probe_line < wasm_line) }
+    index($0, "cmake --build build/wasm --target cnc_sim_wasm_runtime_probe cnc_sim_wasm --parallel \"$build_jobs\"") {
+        runtime_pos = index($0, "cnc_sim_wasm_runtime_probe")
+        wasm_pos = index($0, " cnc_sim_wasm ")
+    }
+    END { exit !(runtime_pos && wasm_pos && runtime_pos < wasm_pos) }
 ' build-wasm.sh; then
     echo "build-wasm does not build the CMake runtime probe before the browser WASM target" >&2
     exit 1
 fi
 grep -F -- 'default_manifest="$PWD/linuxcnc-rs274-wasm-source-files.txt"' build-wasm.sh >/dev/null
-grep -F -- 'manifest_core_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core)' build-wasm.sh >/dev/null
-grep -F -- 'manifest_blocked_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" blocked)' build-wasm.sh >/dev/null
+grep -F -- 'manifest_core_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core)' build-wasm.sh >/dev/null
+grep -F -- 'manifest_blocked_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" blocked)' build-wasm.sh >/dev/null
 grep -F -- 'count_nonempty_lines() {' build-wasm.sh >/dev/null
 grep -F -- 'manifest_core_count=$(count_nonempty_lines "$manifest_core_output")' build-wasm.sh >/dev/null
 grep -F -- 'manifest_blocked_count=$(count_nonempty_lines "$manifest_blocked_output")' build-wasm.sh >/dev/null
-grep -F -- 'LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest" --require-rs274-complete' build-wasm.sh >/dev/null
+grep -F -- 'LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest" --require-rs274-complete' build-wasm.sh >/dev/null
 if grep -F 'grep -c . <<<"$manifest_core_output" || true' build-wasm.sh >/dev/null; then
     echo "build-wasm still counts manifest output through grep -c with || true" >&2
     exit 1
 fi
 grep -F -- 'if [[ "$manifest" == "$default_manifest" ]] && [[ "$manifest_core_count" -ne 25 || "$manifest_blocked_count" -ne 9 ]]; then' build-wasm.sh >/dev/null
-grep -Fx 'LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
+grep -F 'LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest"' test-linuxcnc-wasm-cmake-safe-probe.sh >/dev/null
 ./list-linuxcnc-wasm-safe-shims.sh >/dev/null
 ./list-linuxcnc-wasm-safe-project-sources.sh >/dev/null
 ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core >/dev/null
@@ -746,6 +1160,7 @@ bad_default_manifest_log=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_bad_default_wasm_mani
 linuxcnc_root_abs=$(cd "$linuxcnc_root" && pwd)
 cp build-wasm.sh "$bad_default_manifest_dir/build-wasm.sh"
 cp check-linuxcnc-inputs.sh "$bad_default_manifest_dir/check-linuxcnc-inputs.sh"
+cp check-linuxcnc-inputs-cached.sh "$bad_default_manifest_dir/check-linuxcnc-inputs-cached.sh"
 cp list-linuxcnc-source-files.sh "$bad_default_manifest_dir/list-linuxcnc-source-files.sh"
 cp list-linuxcnc-manifest-sources.sh "$bad_default_manifest_dir/list-linuxcnc-manifest-sources.sh"
 cp list-linuxcnc-wasm-manifest-sources.sh "$bad_default_manifest_dir/list-linuxcnc-wasm-manifest-sources.sh"
@@ -887,8 +1302,8 @@ manifest_core_count=0
 manifest_blocked_count=0
 manifest_core_sources="$build_dir/wasm_core_sources.txt"
 manifest_blocked_sources="$build_dir/wasm_blocked_sources.txt"
-./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core > "$manifest_core_sources"
-./list-linuxcnc-wasm-manifest-sources.sh "$manifest" blocked > "$manifest_blocked_sources"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core > "$manifest_core_sources"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" blocked > "$manifest_blocked_sources"
 manifest_core_count=$(wc -l < "$manifest_core_sources")
 manifest_blocked_count=$(wc -l < "$manifest_blocked_sources")
 
@@ -988,21 +1403,24 @@ grep -F '$<TARGET_OBJECTS:cnc_sim_objects>' core/CMakeLists.txt >/dev/null
 grep -F 'CNC_SIM_ENABLE_LINUXCNC_RS274_BACKEND' core/CMakeLists.txt >/dev/null
 grep -F '#ifndef CNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE' core/src/linuxcnc_rs274_backend.cpp >/dev/null
 
+fi
+
 if ! command -v cmake >/dev/null 2>&1; then
     echo "cmake not found; skipping linuxcnc wasm-safe CMake probe target"
     exit 0
 fi
 
-cmake -S core -B "$build_dir" \
-    -DCMAKE_BUILD_TYPE=Release \
-    -DCNC_SIM_LINUXCNC_ROOT="$linuxcnc_root" \
-    -DCNC_SIM_LINUXCNC_WASM_SOURCE_MANIFEST="$manifest" \
-    -DCNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE=ON
+if [[ "$configure_cmake" -eq 1 ]]; then
+    cmake -S core -B "$build_dir" \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DCNC_SIM_LINUXCNC_ROOT="$linuxcnc_root" \
+        -DCNC_SIM_LINUXCNC_WASM_SOURCE_MANIFEST="$manifest" \
+        -DCNC_SIM_ENABLE_LINUXCNC_WASM_SAFE_PROBE=ON \
+        "${cmake_compiler_launcher_args[@]}"
+fi
 
-cmake --build "$build_dir" --target linuxcnc_rs274_wasm_safe_probe_objects --parallel "$build_jobs"
-cmake --build "$build_dir" --target linuxcnc_rs274_wasm_safe_probe --parallel "$build_jobs"
+cmake --build "$build_dir" --target linuxcnc_rs274_wasm_safe_probe cnc_sim_wasm_runtime_probe --parallel "$build_jobs"
 "$build_dir/linuxcnc_rs274_wasm_safe_probe"
-cmake --build "$build_dir" --target cnc_sim_wasm_runtime_probe --parallel "$build_jobs"
 "$build_dir/cnc_sim_wasm_runtime_probe"
 
 echo "linuxcnc wasm-safe CMake probe target passed"

test-linuxcnc-wasm-interp-base-link.sh

@@ -3,25 +3,8 @@ set -euo pipefail
 
 cd "$(dirname "$0")"
 
-linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
-cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_interp_base_link.XXXXXX")
+probe=$(./build-linuxcnc-wasm-standalone-probe.sh --mode interp-base-link)
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
-
-dlfcn_shim=$(./list-linuxcnc-wasm-safe-shims.sh dlfcn.cc)
-interp_base_source=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-files.sh src/emc/rs274ngc/interp_base.cc)
-
-common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh)
-mapfile -t common_flags <<<"$common_flag_output"
-
-"$cxx" "${common_flags[@]}" \
-    "$dlfcn_shim" \
-    "$interp_base_source" \
-    core/wasm_shims/interp_base_probe_main.cc \
-    -o "$build_dir/interp_base_probe"
-
-"$build_dir/interp_base_probe"
+"$probe"
 
 echo "linuxcnc wasm interp_base link probe passed"

test-linuxcnc-wasm-interp-find-link.sh

@@ -5,10 +5,35 @@ cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_interp_find_link.XXXXXX")
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+build_dir=${CNC_SIM_WASM_INTERP_FIND_BUILD_DIR-build/wasm-interp-find-link}
+if [[ -z "$build_dir" ]]; then
+    echo "CNC_SIM_WASM_INTERP_FIND_BUILD_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$build_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_WASM_INTERP_FIND_BUILD_DIR must not contain whitespace: $build_dir" >&2
+    exit 1
+fi
+mkdir -p "$build_dir"
+build_dir=$(cd "$build_dir" && pwd)
+if [[ "$build_dir" == "/" ]]; then
+    echo "CNC_SIM_WASM_INTERP_FIND_BUILD_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 9>"$build_dir/interp-find.lock"
+flock 9
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-"$build_dir/preflight-cache"}
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 
 tooldata_mmap_backend_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_mmap_backend.cc)
 tooldata_runtime_stubs_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_runtime_stubs.cc)
@@ -23,38 +48,71 @@ interp_find_source=${linuxcnc_sources[1]}
 common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh --function-sections --data-sections)
 mapfile -t common_flags <<<"$common_flag_output"
 
-"$cxx" "${common_flags[@]}" \
-    -c "$tooldata_common_source" \
-    -o "$build_dir/tooldata_common.o"
-"$cxx" "${common_flags[@]}" \
-    -c "$tooldata_mmap_backend_shim" \
-    -o "$build_dir/tooldata_mmap_backend.o"
-"$cxx" "${common_flags[@]}" \
-    -c "$tooldata_runtime_stubs_shim" \
-    -o "$build_dir/tooldata_runtime_stubs.o"
-"$cxx" "${common_flags[@]}" \
-    -c "$rtapi_compat_shim" \
-    -o "$build_dir/rtapi_compat.o"
-"$cxx" "${common_flags[@]}" \
-    -c core/wasm_shims/interp_find_probe_stubs.cc \
-    -o "$build_dir/interp_find_probe_stubs.o"
-"$cxx" "${common_flags[@]}" \
-    -c "$interp_find_source" \
-    -o "$build_dir/interp_find.o"
-"$cxx" "${common_flags[@]}" \
-    -c core/wasm_shims/interp_find_probe_main.cc \
-    -o "$build_dir/interp_find_probe_main.o"
+sources=(
+    "$tooldata_common_source"
+    "$tooldata_mmap_backend_shim"
+    "$tooldata_runtime_stubs_shim"
+    "$rtapi_compat_shim"
+    core/wasm_shims/interp_find_probe_stubs.cc
+    "$interp_find_source"
+    core/wasm_shims/interp_find_probe_main.cc
+)
+objects=(
+    "$build_dir/tooldata_common.o"
+    "$build_dir/tooldata_mmap_backend.o"
+    "$build_dir/tooldata_runtime_stubs.o"
+    "$build_dir/rtapi_compat.o"
+    "$build_dir/interp_find_probe_stubs.o"
+    "$build_dir/interp_find.o"
+    "$build_dir/interp_find_probe_main.o"
+)
 
-"$cxx" \
-    "$build_dir/tooldata_common.o" \
-    "$build_dir/tooldata_mmap_backend.o" \
-    "$build_dir/tooldata_runtime_stubs.o" \
-    "$build_dir/rtapi_compat.o" \
-    "$build_dir/interp_find_probe_stubs.o" \
-    "$build_dir/interp_find.o" \
-    "$build_dir/interp_find_probe_main.o" \
-    -Wl,--gc-sections \
-    -o "$build_dir/interp_find_probe"
+signature="$build_dir/interp-find.signature"
+next_signature="$build_dir/interp-find.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'SOURCES:\n'
+    printf '%s\n' "${sources[@]}"
+} > "$next_signature"
+if [[ ! -f "$signature" ]] || ! cmp -s "$signature" "$next_signature"; then
+    rm -f "$build_dir"/*.o "$build_dir"/*.d "$build_dir/interp_find_probe"
+fi
+mv "$next_signature" "$signature"
+
+makefile="$build_dir/interp-find.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n\n'
+    printf 'OBJECTS :='
+    printf ' %s' "${objects[@]}"
+    printf '\n\n'
+    printf 'DEP_FILES :=\n'
+    for object in "${objects[@]}"; do
+        printf 'DEP_FILES += %s.d\n' "$object"
+    done
+    printf '\n.PHONY: all\n'
+    printf 'all: %s/interp_find_probe\n\n' "$build_dir"
+
+    object_index=0
+    for source in "${sources[@]}"; do
+        printf '%s: %s\n' "${objects[$object_index]}" "$source"
+        printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n' "${objects[$object_index]}" "$source" "${objects[$object_index]}"
+        object_index=$((object_index + 1))
+    done
+
+    printf '%s/interp_find_probe: $(OBJECTS)\n' "$build_dir"
+    printf '\t@$(CXX) $(OBJECTS) -Wl,--gc-sections -o %s/interp_find_probe\n\n' "$build_dir"
+    printf '\n-include $(DEP_FILES)\n'
+} > "$makefile"
+make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null
 
 "$build_dir/interp_find_probe"
 

test-linuxcnc-wasm-python-c-api-symbols.sh

@@ -5,10 +5,35 @@ cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_python_c_api_symbols.XXXXXX")
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+build_dir=${CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR-build/wasm-python-c-api-symbols}
+if [[ -z "$build_dir" ]]; then
+    echo "CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$build_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR must not contain whitespace: $build_dir" >&2
+    exit 1
+fi
+mkdir -p "$build_dir"
+build_dir=$(cd "$build_dir" && pwd)
+if [[ "$build_dir" == "/" ]]; then
+    echo "CNC_SIM_WASM_PYTHON_C_API_BUILD_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 9>"$build_dir/python-c-api.lock"
+flock 9
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-"$build_dir/preflight-cache"}
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 
 python_c_api_shim=$(./list-linuxcnc-wasm-safe-shims.sh python_c_api_shim.cc)
 runtime_shim=$(./list-linuxcnc-wasm-safe-shims.sh linuxcnc_runtime_shim.cc)
@@ -33,22 +58,114 @@ python_binding_sources=("${linuxcnc_sources[@]:6}")
 common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh)
 mapfile -t common_flags <<<"$common_flag_output"
 
-"$cxx" "${common_flags[@]}" \
-    -c "$python_c_api_shim" \
-    -o "$build_dir/python_c_api_shim.o"
-"$cxx" "${common_flags[@]}" \
-    -c "$runtime_shim" \
-    -o "$build_dir/runtime_shim.o"
+objects=(
+    "$build_dir/python_c_api_shim.o"
+    "$build_dir/runtime_shim.o"
+)
+object_sources=(
+    "$python_c_api_shim"
+    "$runtime_shim"
+)
+for source in "${python_binding_sources[@]}"; do
+    object_name=$(basename "$source" .cc)
+    objects+=("$build_dir/$object_name.o")
+    object_sources+=("$source")
+done
 
-nm --defined-only "$build_dir/python_c_api_shim.o" \
-    | awk '$2 ~ /^[A-Z]$/ {print $3}' \
-    | LC_ALL=C sort -u \
-    > "$build_dir/shim.exports"
+signature="$build_dir/python-c-api.signature"
+next_signature="$build_dir/python-c-api.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'SOURCES:\n'
+    printf '%s\n' "${object_sources[@]}"
+} > "$next_signature"
+if [[ ! -f "$signature" ]] || ! cmp -s "$signature" "$next_signature"; then
+    rm -f "$build_dir"/*.o "$build_dir"/*.d
+fi
+mv "$next_signature" "$signature"
 
-rg -o 'Py[A-Za-z0-9_]+' "${linuxcnc_sources[@]}" \
-    | sed 's/^.*://' \
-    | LC_ALL=C sort -u \
-    > "$build_dir/linuxcnc.py-tokens"
+makefile="$build_dir/python-c-api.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n\n'
+    printf 'OBJECTS :='
+    printf ' %s' "${objects[@]}"
+    printf '\n\n'
+    printf 'DEP_FILES :=\n'
+    for object in "${objects[@]}"; do
+        printf 'DEP_FILES += %s.d\n' "$object"
+    done
+    printf '\n.PHONY: all\n'
+    printf 'all: $(OBJECTS)\n\n'
+
+    object_index=0
+    for source in "${object_sources[@]}"; do
+        printf '%s: %s\n' "${objects[$object_index]}" "$source"
+        printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n' "${objects[$object_index]}" "$source" "${objects[$object_index]}"
+        object_index=$((object_index + 1))
+    done
+    printf '\n-include $(DEP_FILES)\n'
+} > "$makefile"
+make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null
+
+source_symbols_signature="$build_dir/python-c-api.source-symbols.signature"
+source_symbols_next_signature="$build_dir/python-c-api.source-symbols.signature.next"
+{
+    printf 'SOURCE_SYMBOL_RULE_VERSION=1\n'
+    printf 'LINUXCNC_SOURCES:\n'
+    printf '%s\n' "${linuxcnc_sources[@]}"
+    printf 'SOURCE_STATS:\n'
+    stat -c 'SOURCE=%n:%s:%y' "${linuxcnc_sources[@]}"
+} > "$source_symbols_next_signature"
+if [[ ! -f "$source_symbols_signature" || ! -f "$build_dir/linuxcnc.py-tokens" ]] ||
+    ! cmp -s "$source_symbols_signature" "$source_symbols_next_signature"; then
+    rg -o 'Py[A-Za-z0-9_]+' "${linuxcnc_sources[@]}" \
+        | sed 's/^.*://' \
+        | LC_ALL=C sort -u \
+        > "$build_dir/linuxcnc.py-tokens"
+    mv "$source_symbols_next_signature" "$source_symbols_signature"
+else
+    rm -f "$source_symbols_next_signature"
+fi
+
+object_symbols_signature="$build_dir/python-c-api.object-symbols.signature"
+object_symbols_next_signature="$build_dir/python-c-api.object-symbols.signature.next"
+{
+    printf 'OBJECT_SYMBOL_RULE_VERSION=1\n'
+    stat -c 'OBJECT=%n:%s:%y' "${objects[@]}"
+} > "$object_symbols_next_signature"
+if [[ ! -f "$object_symbols_signature" ||
+        ! -f "$build_dir/shim.exports" ||
+        ! -f "$build_dir/object.undefined" ||
+        ! -f "$build_dir/object.defined" ]] ||
+    ! cmp -s "$object_symbols_signature" "$object_symbols_next_signature"; then
+    nm --defined-only "$build_dir/python_c_api_shim.o" \
+        | awk '$2 ~ /^[A-Z]$/ {print $3}' \
+        | LC_ALL=C sort -u \
+        > "$build_dir/shim.exports"
+
+    nm -u "$build_dir"/*.o \
+        | awk '{print $2}' \
+        | sed '/^$/d' \
+        | LC_ALL=C sort -u \
+        > "$build_dir/object.undefined"
+    nm --defined-only "$build_dir"/*.o \
+        | awk '{print $3}' \
+        | sed '/^$/d' \
+        | LC_ALL=C sort -u \
+        > "$build_dir/object.defined"
+    mv "$object_symbols_next_signature" "$object_symbols_signature"
+else
+    rm -f "$object_symbols_next_signature"
+fi
 
 awk '
     $0 == "PyObject" { next }
@@ -99,23 +216,6 @@ grep -F "Py_DecRef" core/wasm_shims/boost/python/object.hpp >/dev/null
 grep -F "_Py_NoneStructPtr" core/wasm_shims/boost/python/object.hpp >/dev/null
 grep -F 'extern "C" PyObject *PyInit_gcode(void)' core/wasm_shims/linuxcnc_runtime_shim.cc >/dev/null
 
-for source in "${python_binding_sources[@]}"; do
-    object_name=$(basename "$source" .cc)
-    "$cxx" "${common_flags[@]}" \
-        -c "$source" \
-        -o "$build_dir/$object_name.o"
-done
-
-nm -u "$build_dir"/*.o \
-    | awk '{print $2}' \
-    | sed '/^$/d' \
-    | LC_ALL=C sort -u \
-    > "$build_dir/object.undefined"
-nm --defined-only "$build_dir"/*.o \
-    | awk '{print $3}' \
-    | sed '/^$/d' \
-    | LC_ALL=C sort -u \
-    > "$build_dir/object.defined"
 comm -23 "$build_dir/object.undefined" "$build_dir/object.defined" \
     | awk '/^_?Py/ { print }' \
     > "$build_dir/object.missing-python"

test-linuxcnc-wasm-python-plugin-link.sh

@@ -3,23 +3,8 @@ set -euo pipefail
 
 cd "$(dirname "$0")"
 
-linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
-cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_python_plugin_link.XXXXXX")
+probe=$(./build-linuxcnc-wasm-standalone-probe.sh --mode python-plugin-link)
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
-
-python_plugin_shim=$(./list-linuxcnc-wasm-safe-shims.sh python_plugin.cc)
-
-common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh)
-mapfile -t common_flags <<<"$common_flag_output"
-
-"$cxx" "${common_flags[@]}" \
-    "$python_plugin_shim" \
-    core/wasm_shims/pythonplugin/python_plugin_probe_main.cc \
-    -o "$build_dir/python_plugin_probe"
-
-"$build_dir/python_plugin_probe"
+"$probe"
 
 echo "linuxcnc wasm python_plugin link probe passed"

test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh

@@ -4,13 +4,12 @@ set -euo pipefail
 cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
-cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_rs274ngc_pre_link_blockers.XXXXXX")
+work_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_rs274ngc_pre_link_blockers.XXXXXX")
 manifest=${1:-linuxcnc-rs274-wasm-source-files.txt}
 keep_report_file=0
 
 cleanup_rs274ngc_pre_blocker_temps() {
-    rm -rf "$build_dir"
+    rm -rf "$work_dir"
     if [[ "$keep_report_file" -eq 0 && -n "${report_file:-}" ]]; then
         rm -f "$report_file"
     fi
@@ -22,11 +21,11 @@ if awk '/^} > "\$report_file" \|\| true$/{ found = 1 } END { exit !found }' test
     exit 1
 fi
 if ! awk '
-    index($0, "LINUXCNC_ROOT=\"$linuxcnc_root\" ./check-linuxcnc-inputs.sh \"$manifest\"") { check_line = NR }
-    index($0, "report_file=$(mktemp ") { report_line = NR }
+    index($0, "check-linuxcnc-inputs-cached.sh --cache-dir \"$preflight_cache_dir\" \"$manifest\"") { check_line = NR }
+    index($0, "cache_dir=${CNC_SIM_WASM_RS274NGC_PRE_LINK_BLOCKERS_CACHE_DIR-build/wasm-rs274ngc-pre-link-blockers}") { report_line = NR }
     END { exit !(check_line && report_line && check_line < report_line) }
 ' test-linuxcnc-wasm-rs274ngc-pre-link-blockers.sh; then
-    echo "rs274ngc_pre blocker scan creates its report before input validation" >&2
+    echo "rs274ngc_pre blocker scan prepares its report cache before input validation" >&2
     exit 1
 fi
 if ! awk '
@@ -38,58 +37,69 @@ if ! awk '
     echo "rs274ngc_pre blocker scan does not clean failed reports before preserving successful ones" >&2
     exit 1
 fi
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
-report_file=$(mktemp "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_rs274ngc_pre_undefined.XXXXXX.txt")
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/wasm-probe-preflight-cache}
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest"
+cache_dir=${CNC_SIM_WASM_RS274NGC_PRE_LINK_BLOCKERS_CACHE_DIR-build/wasm-rs274ngc-pre-link-blockers}
+if [[ -z "$cache_dir" ]]; then
+    echo "CNC_SIM_WASM_RS274NGC_PRE_LINK_BLOCKERS_CACHE_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$cache_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_WASM_RS274NGC_PRE_LINK_BLOCKERS_CACHE_DIR must not contain whitespace: $cache_dir" >&2
+    exit 1
+fi
+mkdir -p "$cache_dir"
+cache_dir=$(cd "$cache_dir" && pwd)
+if [[ "$cache_dir" == "/" ]]; then
+    echo "CNC_SIM_WASM_RS274NGC_PRE_LINK_BLOCKERS_CACHE_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 8>"$cache_dir/rs274ngc-pre-link-blockers.lock"
+flock 8
 
-common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh --profile core20-sections)
-mapfile -t common_flags <<<"$common_flag_output"
+object_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./build-linuxcnc-wasm-probe-objects.sh --mode rs274ngc-pre "$manifest")
+mapfile -t objects <<<"$object_output"
+manifest=$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 
-shim_output=$(./list-linuxcnc-wasm-safe-shims.sh)
-mapfile -t shim_sources <<<"$shim_output"
+undefined_file="$work_dir/undefined.raw"
+defined_file="$work_dir/defined.raw"
+signature="$cache_dir/rs274ngc-pre-link-blockers.signature"
+next_signature="$cache_dir/rs274ngc-pre-link-blockers.signature.next"
+report_file="$cache_dir/rs274ngc-pre-link-blockers.txt"
+next_report_file="$cache_dir/rs274ngc-pre-link-blockers.txt.next"
+{
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'MANIFEST=%s\n' "$manifest"
+    printf 'FILTER_RULE_VERSION=1\n'
+    printf 'OBJECTS:\n'
+    printf '%s\n' "${objects[@]}"
+    printf 'OBJECT_STATS:\n'
+    stat -c 'OBJECT=%n:%s:%y' "${objects[@]}"
+} > "$next_signature"
+if [[ -f "$signature" && -f "$report_file" ]] && cmp -s "$signature" "$next_signature"; then
+    keep_report_file=1
+    if [[ -s "$report_file" ]]; then
+        echo "unexpected cached unresolved project symbols after rs274ngc_pre shim coverage:" >&2
+        sed -n '1,120p' "$report_file" >&2
+        exit 1
+    fi
+    echo "linuxcnc wasm rs274ngc_pre link blocker scan passed"
+    echo "wrote $report_file"
+    rm -f "$next_signature"
+    exit 0
+fi
+report_file="$next_report_file"
+rm -f "$next_report_file"
 
-project_source_output=$(./list-linuxcnc-wasm-safe-project-sources.sh)
-mapfile -t project_sources <<<"$project_source_output"
-
-source_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core full)
-mapfile -t linuxcnc_sources <<<"$source_output"
-
-shim_index=0
-for source in "${shim_sources[@]}"; do
-    obj="$build_dir/shim_${shim_index}.o"
-    "$cxx" "${common_flags[@]}" -c "$source" -o "$obj"
-    shim_index=$((shim_index + 1))
-done
-
-project_index=0
-for source in "${project_sources[@]}"; do
-    obj="$build_dir/project_${project_index}.o"
-    source_flags=()
-    case "$source" in
-        core/src/linuxcnc_corexykins_adapter.c|core/src/linuxcnc_genserfuncs_adapter.c|core/src/linuxcnc_xyzab_tdr_kins_adapter.c)
-            source_flags+=(-fpermissive)
-            ;;
-    esac
-    "$cxx" "${common_flags[@]}" "${source_flags[@]}" -c "$source" -o "$obj"
-    project_index=$((project_index + 1))
-done
-
-linuxcnc_index=0
-for source in "${linuxcnc_sources[@]}"; do
-    obj="$build_dir/linuxcnc_${linuxcnc_index}.o"
-    "$cxx" "${common_flags[@]}" -c "$source" -o "$obj"
-    linuxcnc_index=$((linuxcnc_index + 1))
-done
-
-undefined_file="$build_dir/undefined.raw"
-defined_file="$build_dir/defined.raw"
-
-nm -u "$build_dir"/*.o \
+nm -u "${objects[@]}" \
     | awk '{print $2}' \
     | sed '/^$/d' \
     | LC_ALL=C sort -u \
     > "$undefined_file"
 
-nm --defined-only "$build_dir"/*.o \
+nm --defined-only "${objects[@]}" \
     | awk '{print $3}' \
     | sed '/^$/d' \
     | LC_ALL=C sort -u \
@@ -151,6 +161,9 @@ if [[ -s "$report_file" ]]; then
     exit 1
 fi
 
+mv "$next_signature" "$signature"
+mv "$next_report_file" "$cache_dir/rs274ngc-pre-link-blockers.txt"
+report_file="$cache_dir/rs274ngc-pre-link-blockers.txt"
 echo "linuxcnc wasm rs274ngc_pre link blocker scan passed"
 keep_report_file=1
 echo "wrote $report_file"

test-linuxcnc-wasm-rs274ngc-pre-link.sh

@@ -3,51 +3,11 @@ set -euo pipefail
 
 cd "$(dirname "$0")"
 
-linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
-cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_rs274ngc_pre_link.XXXXXX")
 manifest=${1:-linuxcnc-rs274-wasm-source-files.txt}
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/wasm-probe-preflight-cache}
+probe=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./build-linuxcnc-wasm-link-probe.sh --mode rs274ngc-pre "$manifest")
 
-common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh --profile core20-sections)
-mapfile -t common_flags <<<"$common_flag_output"
-
-shim_output=$(./list-linuxcnc-wasm-safe-shims.sh)
-mapfile -t sources <<<"$shim_output"
-project_source_output=$(./list-linuxcnc-wasm-safe-project-sources.sh)
-mapfile -t project_sources <<<"$project_source_output"
-sources+=("${project_sources[@]}")
-
-source_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core full)
-mapfile -t linuxcnc_sources <<<"$source_output"
-for source in "${linuxcnc_sources[@]}"; do
-    sources+=("$source")
-done
-
-sources+=(core/wasm_shims/rs274ngc_pre_probe_main.cc)
-
-objects=()
-object_index=0
-for source in "${sources[@]}"; do
-    obj="$build_dir/source_${object_index}.o"
-    source_flags=()
-    case "$source" in
-        core/src/linuxcnc_genserfuncs_adapter.c|core/src/linuxcnc_xyzab_tdr_kins_adapter.c)
-            source_flags+=(-fpermissive)
-            ;;
-    esac
-    "$cxx" "${common_flags[@]}" "${source_flags[@]}" -c "$source" -o "$obj"
-    objects+=("$obj")
-    object_index=$((object_index + 1))
-done
-
-"$cxx" "${objects[@]}" \
-    -Wl,--gc-sections \
-    -lfmt \
-    -o "$build_dir/rs274ngc_pre_probe"
-
-"$build_dir/rs274ngc_pre_probe"
+"$probe"
 
 echo "linuxcnc wasm rs274ngc_pre link probe passed"

test-linuxcnc-wasm-rs274ngc-pre-object.sh

@@ -3,19 +3,6 @@ set -euo pipefail
 
 cd "$(dirname "$0")"
 
-linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
-cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_rs274ngc_pre_object.XXXXXX")
-
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
-rs274ngc_pre_source=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-files.sh src/emc/rs274ngc/rs274ngc_pre.cc)
-
-common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh)
-mapfile -t common_flags <<<"$common_flag_output"
-
-"$cxx" "${common_flags[@]}" \
-    -c "$rs274ngc_pre_source" \
-    -o "$build_dir/rs274ngc_pre.o"
+./build-linuxcnc-wasm-standalone-probe.sh --mode rs274ngc-pre-object >/dev/null
 
 echo "linuxcnc wasm rs274ngc_pre object probe passed"

test-linuxcnc-wasm-runtime-link.sh

@@ -3,63 +3,33 @@ set -euo pipefail
 
 cd "$(dirname "$0")"
 
-linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
-cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_runtime_link.XXXXXX")
 manifest=${1:-linuxcnc-rs274-wasm-source-files.txt}
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/wasm-probe-preflight-cache}
+probe=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" ./build-linuxcnc-wasm-link-probe.sh --mode runtime "$manifest")
+probe_dir=$(dirname "$probe")
+symbol_file="$probe_dir/runtime.symbols"
+symbol_signature="$probe_dir/runtime.symbols.signature"
+symbol_next_signature="$probe_dir/runtime.symbols.signature.next"
+{
+    printf 'PROBE=%s\n' "$probe"
+    printf 'SYMBOL_RULE_VERSION=1\n'
+    stat -c 'PROBE_STAT=%n:%s:%y' "$probe"
+} > "$symbol_next_signature"
+if [[ ! -f "$symbol_file" || ! -f "$symbol_signature" ]] || ! cmp -s "$symbol_signature" "$symbol_next_signature"; then
+    nm -C "$probe" > "$symbol_file"
+    mv "$symbol_next_signature" "$symbol_signature"
+else
+    rm -f "$symbol_next_signature"
+fi
+grep -F "cnc_sim_parse_program" "$symbol_file" >/dev/null
+grep -F "parse_linuxcnc_rs274_backend" "$symbol_file" >/dev/null
+grep -F "parse_gcode_with_backend" "$symbol_file" >/dev/null
+grep -F "Interp::read(char const*)" "$symbol_file" >/dev/null
+grep -F "Interp::init()" "$symbol_file" >/dev/null
+grep -E '(^| )wordexp($| )' "$symbol_file" >/dev/null
+grep -E '(^| )wordfree($| )' "$symbol_file" >/dev/null
 
-common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh --profile core20-sections)
-mapfile -t common_flags <<<"$common_flag_output"
-common_flags+=(-DCNC_SIM_ENABLE_LINUXCNC_RS274_BACKEND)
-
-shim_output=$(./list-linuxcnc-wasm-safe-shims.sh)
-mapfile -t sources <<<"$shim_output"
-
-core_source_output=$(./list-cmake-set-sources.sh cnc_sim_core_sources core/)
-mapfile -t core_sources <<<"$core_source_output"
-sources+=("${core_sources[@]}")
-
-backend_source_output=$(./list-cmake-set-sources.sh cnc_sim_linuxcnc_rs274_backend_sources core/)
-mapfile -t backend_sources <<<"$backend_source_output"
-sources+=("${backend_sources[@]}")
-
-source_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core full)
-mapfile -t linuxcnc_sources <<<"$source_output"
-sources+=("${linuxcnc_sources[@]}")
-sources+=(core/wasm_shims/cnc_sim_wasm_runtime_probe_main.cc)
-
-objects=()
-object_index=0
-for source in "${sources[@]}"; do
-    obj="$build_dir/source_${object_index}.o"
-    source_flags=()
-    case "$source" in
-        core/src/linuxcnc_genserfuncs_adapter.c|core/src/linuxcnc_xyzab_tdr_kins_adapter.c)
-            source_flags+=(-fpermissive)
-            ;;
-    esac
-    "$cxx" "${common_flags[@]}" "${source_flags[@]}" -c "$source" -o "$obj"
-    objects+=("$obj")
-    object_index=$((object_index + 1))
-done
-
-"$cxx" "${objects[@]}" \
-    -Wl,--gc-sections \
-    -lfmt \
-    -o "$build_dir/cnc_sim_wasm_runtime_probe"
-
-nm -C "$build_dir/cnc_sim_wasm_runtime_probe" > "$build_dir/runtime.symbols"
-grep -F "cnc_sim_parse_program" "$build_dir/runtime.symbols" >/dev/null
-grep -F "parse_linuxcnc_rs274_backend" "$build_dir/runtime.symbols" >/dev/null
-grep -F "parse_gcode_with_backend" "$build_dir/runtime.symbols" >/dev/null
-grep -F "Interp::read(char const*)" "$build_dir/runtime.symbols" >/dev/null
-grep -F "Interp::init()" "$build_dir/runtime.symbols" >/dev/null
-grep -E '(^| )wordexp($| )' "$build_dir/runtime.symbols" >/dev/null
-grep -E '(^| )wordfree($| )' "$build_dir/runtime.symbols" >/dev/null
-
-"$build_dir/cnc_sim_wasm_runtime_probe"
+"$probe"
 
 echo "linuxcnc wasm runtime link probe passed"

test-linuxcnc-wasm-source-objects.sh

@@ -5,33 +5,18 @@ cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 manifest=${1:-linuxcnc-rs274-wasm-source-files.txt}
-cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_safe_probe.XXXXXX")
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-build/wasm-probe-preflight-cache}
 
 shim_output=$(./list-linuxcnc-wasm-safe-shims.sh)
 mapfile -t shim_sources <<<"$shim_output"
 
-common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh --profile core20)
-mapfile -t common_flags <<<"$common_flag_output"
+object_output=$(CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./build-linuxcnc-wasm-probe-objects.sh --mode source-objects "$manifest")
+mapfile -t objects <<<"$object_output"
+if [[ "${#objects[@]}" -lt "${#shim_sources[@]}" ]]; then
+    echo "unexpected wasm-safe object cache count: got ${#objects[@]} fewer than ${#shim_sources[@]} shims" >&2
+    exit 1
+fi
+linuxcnc_object_count=$((${#objects[@]} - ${#shim_sources[@]}))
 
-source_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core full)
-mapfile -t sources <<<"$source_output"
-
-shim_index=0
-for source in "${shim_sources[@]}"; do
-    obj="$build_dir/shim_${shim_index}.o"
-    "$cxx" "${common_flags[@]}" -c "$source" -o "$obj"
-    shim_index=$((shim_index + 1))
-done
-
-source_index=0
-for source in "${sources[@]}"; do
-    obj="$build_dir/linuxcnc_${source_index}.o"
-    "$cxx" "${common_flags[@]}" -c "$source" -o "$obj"
-    source_index=$((source_index + 1))
-done
-
-echo "linuxcnc wasm-safe source object probe passed (${#sources[@]} linuxcnc objects + ${#shim_sources[@]} shims)"
+echo "linuxcnc wasm-safe source object probe passed ($linuxcnc_object_count linuxcnc objects + ${#shim_sources[@]} shims)"

test-linuxcnc-wasm-source-syntax.sh

@@ -6,17 +6,97 @@ cd "$(dirname "$0")"
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 manifest=${1:-linuxcnc-rs274-wasm-source-files.txt}
 cxx=${CXX:-g++}
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+build_dir=${CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR-build/wasm-source-syntax-test}
+if [[ -z "$build_dir" ]]; then
+    echo "CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$build_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR must not contain whitespace: $build_dir" >&2
+    exit 1
+fi
+mkdir -p "$build_dir"
+build_dir=$(cd "$build_dir" && pwd)
+if [[ "$build_dir" == "/" ]]; then
+    echo "CNC_SIM_WASM_SOURCE_SYNTAX_BUILD_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 9>"$build_dir/wasm-source-syntax.lock"
+flock 9
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-"$build_dir/preflight-cache"}
 
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh "$manifest"
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest"
+manifest=$(cd "$(dirname "$manifest")" && pwd)/$(basename "$manifest")
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 
 common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh --profile core20 --syntax-only)
 mapfile -t common_flags <<<"$common_flag_output"
 
-source_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core full)
-mapfile -t sources <<<"$source_output"
+source_list="$build_dir/linuxcnc_wasm_source_syntax_sources.txt"
+CNC_SIM_PREFLIGHT_CACHE_DIR="$preflight_cache_dir" LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-manifest-sources.sh "$manifest" core full > "$source_list"
 
-for source in "${sources[@]}"; do
-    "$cxx" "${common_flags[@]}" "$source"
-done
+wasm_source_syntax_signature="$build_dir/wasm-source-syntax.signature"
+wasm_source_syntax_next_signature="$build_dir/wasm-source-syntax.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'MANIFEST=%s\n' "$manifest"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'SOURCES:\n'
+    cat "$source_list"
+} > "$wasm_source_syntax_next_signature"
+if [[ ! -f "$wasm_source_syntax_signature" ]] || ! cmp -s "$wasm_source_syntax_signature" "$wasm_source_syntax_next_signature"; then
+    rm -f "$build_dir"/source_*.stamp "$build_dir"/source_*.d
+fi
+mv "$wasm_source_syntax_next_signature" "$wasm_source_syntax_signature"
 
-echo "linuxcnc wasm-safe source syntax probe passed (${#sources[@]} files)"
+wasm_source_syntax_makefile="$build_dir/wasm-source-syntax.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n\n'
+    printf 'STAMPS :=\n'
+    source_index=0
+    while IFS= read -r source; do
+        [[ -z "$source" ]] && continue
+        printf 'STAMPS += %s/source_%s.stamp\n' "$build_dir" "$source_index"
+        source_index=$((source_index + 1))
+    done < "$source_list"
+    printf '\n.PHONY: all\n'
+    printf 'all: $(STAMPS)\n\n'
+
+    source_index=0
+    while IFS= read -r source; do
+        [[ -z "$source" ]] && continue
+        printf '%s/source_%s.stamp: %s\n' "$build_dir" "$source_index" "$source"
+        printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s/source_%s.d %s\n' "$build_dir" "$source_index" "$source"
+        printf '\t@touch %s/source_%s.stamp\n\n' "$build_dir" "$source_index"
+        source_index=$((source_index + 1))
+    done < "$source_list"
+
+    printf '%s' '-include'
+    source_index=0
+    while IFS= read -r source; do
+        [[ -z "$source" ]] && continue
+        printf ' %s/source_%s.d' "$build_dir" "$source_index"
+        source_index=$((source_index + 1))
+    done < "$source_list"
+    printf '\n'
+} > "$wasm_source_syntax_makefile"
+make --output-sync=target -j"$build_jobs" -f "$wasm_source_syntax_makefile"
+
+source_count=$(grep -c . "$source_list")
+echo "linuxcnc wasm-safe source syntax probe passed ($source_count files)"

test-linuxcnc-wasm-tooldata-common-link.sh

@@ -3,27 +3,8 @@ set -euo pipefail
 
 cd "$(dirname "$0")"
 
-linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
-cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_tooldata_common_link.XXXXXX")
+probe=$(./build-linuxcnc-wasm-standalone-probe.sh --mode tooldata-common-link)
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
-
-tooldata_mmap_backend_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_mmap_backend.cc)
-tooldata_runtime_stubs_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_runtime_stubs.cc)
-tooldata_common_source=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-files.sh src/emc/tooldata/tooldata_common.cc)
-
-common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh --tooldata-include)
-mapfile -t common_flags <<<"$common_flag_output"
-
-"$cxx" "${common_flags[@]}" \
-    "$tooldata_common_source" \
-    "$tooldata_mmap_backend_shim" \
-    "$tooldata_runtime_stubs_shim" \
-    core/wasm_shims/tooldata/tooldata_common_probe_main.cc \
-    -o "$build_dir/tooldata_common_probe"
-
-"$build_dir/tooldata_common_probe"
+"$probe"
 
 echo "linuxcnc wasm tooldata_common link probe passed"

test-linuxcnc-wasm-tooldata-link.sh

@@ -3,29 +3,10 @@ set -euo pipefail
 
 cd "$(dirname "$0")"
 
-linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
-cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_tooldata_link.XXXXXX")
+probe=$(./build-linuxcnc-wasm-standalone-probe.sh --mode tooldata-link)
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
-
-tooldata_mmap_backend_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_mmap_backend.cc)
-tooldata_runtime_stubs_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_runtime_stubs.cc)
-tooldata_common_source=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-files.sh src/emc/tooldata/tooldata_common.cc)
-
-common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh)
-mapfile -t common_flags <<<"$common_flag_output"
-
-"$cxx" "${common_flags[@]}" \
-    "$tooldata_common_source" \
-    "$tooldata_mmap_backend_shim" \
-    "$tooldata_runtime_stubs_shim" \
-    core/wasm_shims/tooldata/tooldata_probe_main.cc \
-    -o "$build_dir/tooldata_probe"
-
-"$build_dir/tooldata_probe" 2>"$build_dir/tooldata_probe.err"
-grep -F "tool_mmap_user(): tool mmap not available" "$build_dir/tooldata_probe.err" >/dev/null
-grep -F "tooldata_put() no tool_mmap_base" "$build_dir/tooldata_probe.err" >/dev/null
+"$probe" 2>"$probe.err"
+grep -F "tool_mmap_user(): tool mmap not available" "$probe.err" >/dev/null
+grep -F "tooldata_put() no tool_mmap_base" "$probe.err" >/dev/null
 
 echo "linuxcnc wasm tooldata shim link probe passed"

test-linuxcnc-wasm-tooldata-mmap-symbols.sh

@@ -5,10 +5,35 @@ cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_tooldata_mmap_symbols.XXXXXX")
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+build_dir=${CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR-build/wasm-tooldata-mmap-symbols}
+if [[ -z "$build_dir" ]]; then
+    echo "CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$build_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR must not contain whitespace: $build_dir" >&2
+    exit 1
+fi
+mkdir -p "$build_dir"
+build_dir=$(cd "$build_dir" && pwd)
+if [[ "$build_dir" == "/" ]]; then
+    echo "CNC_SIM_WASM_TOOLDATA_MMAP_SYMBOLS_BUILD_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 9>"$build_dir/tooldata-mmap-symbols.lock"
+flock 9
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-"$build_dir/preflight-cache"}
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 
 tooldata_mmap_backend_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_mmap_backend.cc)
 tooldata_mmap_source=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-files.sh src/emc/tooldata/tooldata_mmap.cc)
@@ -16,23 +41,80 @@ tooldata_mmap_source=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-source-fil
 common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh)
 mapfile -t common_flags <<<"$common_flag_output"
 
-"$cxx" "${common_flags[@]}" \
-    -c "$tooldata_mmap_backend_shim" \
-    -o "$build_dir/tooldata_mmap_backend.o"
+sources=(
+    "$tooldata_mmap_backend_shim"
+    "$tooldata_mmap_source"
+)
+objects=(
+    "$build_dir/tooldata_mmap_backend.o"
+    "$build_dir/linuxcnc_tooldata_mmap.o"
+)
 
-"$cxx" "${common_flags[@]}" \
-    -c "$tooldata_mmap_source" \
-    -o "$build_dir/linuxcnc_tooldata_mmap.o"
+signature="$build_dir/tooldata-mmap-symbols.signature"
+next_signature="$build_dir/tooldata-mmap-symbols.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'SOURCES:\n'
+    printf '%s\n' "${sources[@]}"
+} > "$next_signature"
+if [[ ! -f "$signature" ]] || ! cmp -s "$signature" "$next_signature"; then
+    rm -f "$build_dir"/*.o "$build_dir"/*.d
+fi
+mv "$next_signature" "$signature"
 
-nm --defined-only "$build_dir/tooldata_mmap_backend.o" \
-    | awk '$2 ~ /^[A-Z]$/ {print $3}' \
-    | LC_ALL=C sort -u \
-    > "$build_dir/backend.exports"
+makefile="$build_dir/tooldata-mmap-symbols.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n\n'
+    printf 'OBJECTS :='
+    printf ' %s' "${objects[@]}"
+    printf '\n\n'
+    printf 'DEP_FILES :=\n'
+    for object in "${objects[@]}"; do
+        printf 'DEP_FILES += %s.d\n' "$object"
+    done
+    printf '\n.PHONY: all\n'
+    printf 'all: $(OBJECTS)\n\n'
 
-nm --defined-only "$build_dir/linuxcnc_tooldata_mmap.o" \
-    | awk '$2 ~ /^[A-Z]$/ {print $3}' \
-    | LC_ALL=C sort -u \
-    > "$build_dir/linuxcnc.exports"
+    object_index=0
+    for source in "${sources[@]}"; do
+        printf '%s: %s\n' "${objects[$object_index]}" "$source"
+        printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n' "${objects[$object_index]}" "$source" "${objects[$object_index]}"
+        object_index=$((object_index + 1))
+    done
+    printf '\n-include $(DEP_FILES)\n'
+} > "$makefile"
+make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null
+
+symbols_signature="$build_dir/tooldata-mmap-symbols.nm.signature"
+symbols_next_signature="$build_dir/tooldata-mmap-symbols.nm.signature.next"
+{
+    printf 'SYMBOL_RULE_VERSION=1\n'
+    stat -c 'OBJECT=%n:%s:%y' "${objects[@]}"
+} > "$symbols_next_signature"
+if [[ ! -f "$symbols_signature" || ! -f "$build_dir/backend.exports" || ! -f "$build_dir/linuxcnc.exports" ]] ||
+    ! cmp -s "$symbols_signature" "$symbols_next_signature"; then
+    nm --defined-only "$build_dir/tooldata_mmap_backend.o" \
+        | awk '$2 ~ /^[A-Z]$/ {print $3}' \
+        | LC_ALL=C sort -u \
+        > "$build_dir/backend.exports"
+
+    nm --defined-only "$build_dir/linuxcnc_tooldata_mmap.o" \
+        | awk '$2 ~ /^[A-Z]$/ {print $3}' \
+        | LC_ALL=C sort -u \
+        > "$build_dir/linuxcnc.exports"
+    mv "$symbols_next_signature" "$symbols_signature"
+else
+    rm -f "$symbols_next_signature"
+fi
 
 if ! comm -23 "$build_dir/linuxcnc.exports" "$build_dir/backend.exports" > "$build_dir/missing.exports"; then
     exit 1

test-linuxcnc-wasm-tooldata-runtime-symbols.sh

@@ -5,10 +5,35 @@ cd "$(dirname "$0")"
 
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 cxx=${CXX:-g++}
-build_dir=$(mktemp -d "${TMPDIR:-/tmp}/cnc_sim_linuxcnc_wasm_tooldata_runtime_symbols.XXXXXX")
+if [[ -z ${CXX:-} ]] && command -v ccache >/dev/null 2>&1; then
+    cxx="ccache $cxx"
+fi
+build_jobs=${CNC_SIM_BUILD_JOBS:-8}
+if ! [[ "$build_jobs" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CNC_SIM_BUILD_JOBS must be a positive integer: $build_jobs" >&2
+    exit 1
+fi
+build_dir=${CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR-build/wasm-tooldata-runtime-symbols}
+if [[ -z "$build_dir" ]]; then
+    echo "CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR must not be empty" >&2
+    exit 1
+fi
+if [[ "$build_dir" =~ [[:space:]] ]]; then
+    echo "CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR must not contain whitespace: $build_dir" >&2
+    exit 1
+fi
+mkdir -p "$build_dir"
+build_dir=$(cd "$build_dir" && pwd)
+if [[ "$build_dir" == "/" ]]; then
+    echo "CNC_SIM_WASM_TOOLDATA_RUNTIME_SYMBOLS_BUILD_DIR must not be the filesystem root" >&2
+    exit 1
+fi
+exec 9>"$build_dir/tooldata-runtime-symbols.lock"
+flock 9
 
-trap 'rm -rf "$build_dir"' EXIT
-LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs.sh --root-only
+preflight_cache_dir=${CNC_SIM_PREFLIGHT_CACHE_DIR:-"$build_dir/preflight-cache"}
+LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" --root-only
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
 
 tooldata_mmap_backend_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_mmap_backend.cc)
 tooldata_runtime_stubs_shim=$(./list-linuxcnc-wasm-safe-shims.sh tooldata_runtime_stubs.cc)
@@ -22,36 +47,92 @@ tooldata_nml_source=${linuxcnc_sources[1]}
 common_flag_output=$(LINUXCNC_ROOT="$linuxcnc_root" ./list-linuxcnc-wasm-common-cxxflags.sh)
 mapfile -t common_flags <<<"$common_flag_output"
 
-"$cxx" "${common_flags[@]}" \
-    -c "$tooldata_runtime_stubs_shim" \
-    -o "$build_dir/tooldata_runtime_stubs.o"
+sources=(
+    "$tooldata_runtime_stubs_shim"
+    "$tooldata_mmap_backend_shim"
+    "$tooldata_db_source"
+    "$tooldata_nml_source"
+)
+objects=(
+    "$build_dir/tooldata_runtime_stubs.o"
+    "$build_dir/tooldata_mmap_backend.o"
+    "$build_dir/linuxcnc_tooldata_db.o"
+    "$build_dir/linuxcnc_tooldata_nml.o"
+)
 
-"$cxx" "${common_flags[@]}" \
-    -c "$tooldata_mmap_backend_shim" \
-    -o "$build_dir/tooldata_mmap_backend.o"
+signature="$build_dir/tooldata-runtime-symbols.signature"
+next_signature="$build_dir/tooldata-runtime-symbols.signature.next"
+{
+    printf 'CXX=%s\n' "$cxx"
+    printf 'PWD=%s\n' "$PWD"
+    printf 'LINUXCNC_ROOT=%s\n' "$linuxcnc_root"
+    printf 'BUILD_RULE_VERSION=1\n'
+    printf 'COMMON_FLAGS='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n'
+    printf 'SOURCES:\n'
+    printf '%s\n' "${sources[@]}"
+} > "$next_signature"
+if [[ ! -f "$signature" ]] || ! cmp -s "$signature" "$next_signature"; then
+    rm -f "$build_dir"/*.o "$build_dir"/*.d
+fi
+mv "$next_signature" "$signature"
 
-"$cxx" "${common_flags[@]}" \
-    -c "$tooldata_db_source" \
-    -o "$build_dir/linuxcnc_tooldata_db.o"
+makefile="$build_dir/tooldata-runtime-symbols.mk"
+{
+    printf 'CXX := %s\n' "$cxx"
+    printf 'COMMON_FLAGS :='
+    printf ' %s' "${common_flags[@]}"
+    printf '\n\n'
+    printf 'OBJECTS :='
+    printf ' %s' "${objects[@]}"
+    printf '\n\n'
+    printf 'DEP_FILES :=\n'
+    for object in "${objects[@]}"; do
+        printf 'DEP_FILES += %s.d\n' "$object"
+    done
+    printf '\n.PHONY: all\n'
+    printf 'all: $(OBJECTS)\n\n'
 
-"$cxx" "${common_flags[@]}" \
-    -c "$tooldata_nml_source" \
-    -o "$build_dir/linuxcnc_tooldata_nml.o"
+    object_index=0
+    for source in "${sources[@]}"; do
+        printf '%s: %s\n' "${objects[$object_index]}" "$source"
+        printf '\t@$(CXX) $(COMMON_FLAGS) -MMD -MP -MF %s.d -c %s -o %s\n\n' "${objects[$object_index]}" "$source" "${objects[$object_index]}"
+        object_index=$((object_index + 1))
+    done
+    printf '\n-include $(DEP_FILES)\n'
+} > "$makefile"
+make --output-sync=target -j"$build_jobs" -f "$makefile" >/dev/null
 
-nm --defined-only "$build_dir/tooldata_runtime_stubs.o" \
-    | awk '$2 ~ /^[A-Z]$/ {print $3}' \
-    | LC_ALL=C sort -u \
-    > "$build_dir/runtime.exports"
+symbols_signature="$build_dir/tooldata-runtime-symbols.nm.signature"
+symbols_next_signature="$build_dir/tooldata-runtime-symbols.nm.signature.next"
+{
+    printf 'SYMBOL_RULE_VERSION=1\n'
+    stat -c 'OBJECT=%n:%s:%y' "${objects[@]}"
+} > "$symbols_next_signature"
+if [[ ! -f "$symbols_signature" ||
+        ! -f "$build_dir/runtime.exports" ||
+        ! -f "$build_dir/backend.exports" ||
+        ! -f "$build_dir/linuxcnc-runtime.exports" ]] ||
+    ! cmp -s "$symbols_signature" "$symbols_next_signature"; then
+    nm --defined-only "$build_dir/tooldata_runtime_stubs.o" \
+        | awk '$2 ~ /^[A-Z]$/ {print $3}' \
+        | LC_ALL=C sort -u \
+        > "$build_dir/runtime.exports"
 
-nm --defined-only "$build_dir/tooldata_mmap_backend.o" \
-    | awk '$2 ~ /^[A-Z]$/ {print $3}' \
-    | LC_ALL=C sort -u \
-    > "$build_dir/backend.exports"
+    nm --defined-only "$build_dir/tooldata_mmap_backend.o" \
+        | awk '$2 ~ /^[A-Z]$/ {print $3}' \
+        | LC_ALL=C sort -u \
+        > "$build_dir/backend.exports"
 
-nm --defined-only "$build_dir"/linuxcnc_tooldata_*.o \
-    | awk '$2 ~ /^[A-Z]$/ {print $3}' \
-    | LC_ALL=C sort -u \
-    > "$build_dir/linuxcnc-runtime.exports"
+    nm --defined-only "$build_dir"/linuxcnc_tooldata_*.o \
+        | awk '$2 ~ /^[A-Z]$/ {print $3}' \
+        | LC_ALL=C sort -u \
+        > "$build_dir/linuxcnc-runtime.exports"
+    mv "$symbols_next_signature" "$symbols_signature"
+else
+    rm -f "$symbols_next_signature"
+fi
 
 comm -23 "$build_dir/linuxcnc-runtime.exports" "$build_dir/backend.exports" \
     > "$build_dir/expected.exports"

test-native.sh

@@ -29,11 +29,12 @@ if [[ "$build_dir" == "/" ]]; then
 fi
 exec 9>"$build_dir/native-test.lock"
 flock 9
+preflight_cache_dir="$build_dir/preflight-cache"
 
-./check-linuxcnc-inputs.sh linuxcnc-rs274-source-files.txt --require-rs274-complete
-./check-linuxcnc-inputs.sh linuxcnc-rs274-wasm-source-files.txt --require-rs274-complete
-./check-linuxcnc-inputs.sh linuxcnc-kinematics-source-files.txt --require-kinematics-complete
-./check-linuxcnc-switchkins-remap-table.sh linuxcnc-kinematics-source-files.txt
+./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-rs274-source-files.txt --require-rs274-complete
+./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-rs274-wasm-source-files.txt --require-rs274-complete
+./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-kinematics-source-files.txt --require-kinematics-complete
+./check-linuxcnc-switchkins-remap-table-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-kinematics-source-files.txt
 grep -F '#include "linuxcnc_switchkins_remap_table.inc"' core/src/cnc_sim_api.cpp >/dev/null
 grep -F 'switchkins: options.switchkins' web/src/wasm-core.js >/dev/null
 grep -F 'remap: options.remap' web/src/wasm-core.js >/dev/null
@@ -341,6 +342,7 @@ native_next_signature="$build_dir/native-build.signature.next"
 {
     printf 'CXX=%s\n' "$cxx"
     printf 'PWD=%s\n' "$PWD"
+    printf 'BUILD_RULE_VERSION=1\n'
     printf 'SMOKE_CXXFLAGS='
     printf ' %s' "${smoke_cxxflags[@]}"
     printf '\n'