TARGET_EXEC是所有需要生成的可执行文件（.c/.cpp文件去掉后缀）
TARGET_EXEC := test_thpool BUILD_DIR := ./build SRC_DIRS := ./src # Find all the C and C++ files we want to compile # Note the single quotes around the * expressions. Make will incorrectly expand these otherwise. SRCS := $(shell find . $(SRC_DIRS) -name '*.cpp' -or -name '*.c' -or -name '*.s' -maxdepth 1) # String substitution for every C/C++ file. # As an example, hello.cpp turns into ./build/hello.cpp.o OBJS := $(SRCS:%=$(BUILD_DIR)/%.o) # String substitution (suffix version without %). # As an example, ./build/hello.cpp.o turns into ./build/hello.cpp.d DEPS := $(OBJS:.o=.d) # Every folder in ./src will need to be passed to GCC so that it can find header files INC_DIRS := $(shell find $(SRC_DIRS) -type d) # Add a prefix to INC_DIRS. So moduleA would become -ImoduleA. GCC understands this -I flag INC_FLAGS := $(addprefix -I,$(INC_DIRS)) # The -MMD and -MP flags together generate Makefiles for us! # These files will have .d instead of .o as the output. CPPFLAGS := $(INC_FLAGS) -MMD -MP # The final build step. $(BUILD_DIR)/$(TARGET_EXEC): $(OBJS) $(CC) $(OBJS) -o $@ $(LDFLAGS) CFLAGS := -g # Build step for C source $(BUILD_DIR)/%.c.o: %.c mkdir -p $(dir $@) $(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@ CXXFLAGS := -std=c++11 # Build step for C++ source $(BUILD_DIR)/%.cpp.o: %.cpp mkdir -p $(dir $@) $(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@ .PHONY: clean clean: rm -r $(BUILD_DIR) # Include the .d makefiles. The - at the front suppresses the errors of missing # Makefiles. Initially, all the .d files will be missing, and we don't want those # errors to show up. -include $(DEPS)
