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-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"