openwrt_patches-21.02/171-generate-clangd-compile_commands-for-kernel-and-packages.patch

--- a/include/kernel.mk
+++ b/include/kernel.mk
@@ -98,7 +98,13 @@ else
   LINUX_KARCH := $(ARCH)
 endif
 
-KERNEL_MAKE = $(MAKE) $(KERNEL_MAKEOPTS)
+KERNEL_VARS = \
+	LD_PRELOAD="$(STAGING_DIR_HOST)/lib/ldlogger.so" \
+	CC_LOGGER_GCC_LIKE="gcc:g++:clang:clang++:cc:c++" \
+	CC_LOGGER_FILE="$(LINUX_DIR)/compile_commands.json" \
+	CC_LOGGER_KEEP_LINK=true
+
+KERNEL_MAKE = $(KERNEL_VARS) $(MAKE) $(KERNEL_MAKEOPTS)
 
 KERNEL_MAKE_FLAGS = \
 	KCFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR))) $(filter-out -fno-plt,$(call qstrip,$(CONFIG_EXTRA_OPTIMIZATION))) $(call qstrip,$(CONFIG_KERNEL_CFLAGS))" \
--- a/include/package-defaults.mk
+++ b/include/package-defaults.mk
@@ -128,6 +128,12 @@ MAKE_VARS = \
 	CXXFLAGS="$(TARGET_CXXFLAGS) $(EXTRA_CXXFLAGS) $(TARGET_CPPFLAGS) $(EXTRA_CPPFLAGS)" \
 	LDFLAGS="$(TARGET_LDFLAGS) $(EXTRA_LDFLAGS)"
 
+BUILD_LOGGER_VARS = \
+	LD_PRELOAD="$(STAGING_DIR_HOST)/lib/ldlogger.so" \
+	CC_LOGGER_GCC_LIKE="gcc:g++:clang:clang++:cc:c++" \
+	CC_LOGGER_FILE="$(PKG_BUILD_DIR)/compile_commands.json" \
+	CC_LOGGER_KEEP_LINK=true
+
 MAKE_FLAGS = \
 	$(TARGET_CONFIGURE_OPTS) \
 	CROSS="$(TARGET_CROSS)" \
@@ -140,12 +146,25 @@ MAKE_INSTALL_FLAGS = \
 MAKE_PATH ?= .
 
 define Build/Compile/Default
-	+$(MAKE_VARS) \
+	+$(MAKE_VARS) $(BUILD_LOGGER_VARS) \
 	$(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR)/$(MAKE_PATH) \
 		$(MAKE_FLAGS) \
 		$(1);
 endef
 
+GCC_LIB_INC := $(wildcard $(TOOLCHAIN_DIR)/lib/gcc/$(shell $(TARGET_CC) -dumpmachine)/$(shell $(TARGET_CC) --version | head -1 | rev | cut -d ' ' -f 1 | rev)/include)
+ifneq ($(GCC_LIB_INC),)
+define Build/WriteClangdConfig/GccLibInc
+	echo "  Add: -I$(GCC_LIB_INC)" >> $(PKG_BUILD_DIR)/.clangd
+endef
+endif
+
+define Build/WriteClangdConfig
+	echo "CompileFlags:" > $(PKG_BUILD_DIR)/.clangd
+	$(Build/WriteClangdConfig/GccLibInc)
+	echo "  Remove: -mabi=*" >> $(PKG_BUILD_DIR)/.clangd
+endef
+
 define Build/Install/Default
 	$(MAKE_VARS) \
 	$(MAKE) -C $(PKG_BUILD_DIR)/$(MAKE_PATH) \
--- a/include/package.mk
+++ b/include/package.mk
@@ -216,6 +216,7 @@ define Build/CoreTargets
 	$(foreach hook,$(Hooks/Compile/Pre),$(call $(hook))$(sep))
 	$(Build/Compile)
 	$(foreach hook,$(Hooks/Compile/Post),$(call $(hook))$(sep))
+	$(Build/WriteClangdConfig)
 	$(Build/Install)
 	$(foreach hook,$(Hooks/Install/Post),$(call $(hook))$(sep))
 	touch $$@