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

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"