MakeFile .o .d文件放入指定的文件夹

EXTENSION = c

CC = gcc

EXE = main

SUBDIR = src

OBJ = obj

DEP = dep

CPPFLAGS += -I /home/kouwq/Makefile/grokking_algorithms/inc

CXX_SOURCES = $(foreach dir,$(SUBDIR), $(wildcard $(dir)/*.$(EXTENSION)))

CXX_OBJECTS = $(patsubst %.$(EXTENSION), $(OBJ)/%.o, $(notdir $(CXX_SOURCES)))

DEP_FILES = $(patsubst %.$(EXTENSION), $(DEP)/%.d, $(notdir $(CXX_SOURCES)))

$(EXE): $(CXX_OBJECTS)

$(CC) $(CXX_OBJECTS) -o $(EXE)

$(OBJ)/%.o: $(SUBDIR)/%.$(EXTENSION)

$(CC) -c $(CPPFLAGS) $< -o $@

$(DEP)/%.d: $(SUBDIR)/%.$(EXTENSION)

$(CC) $(CPPFLAGS) -MM $< | sed -e 1's,^,$(OBJ)/,' > $@

ifneq "$(MAKECMDGOALS)" "clean"

-include $(DEP_FILES)

endif

.PHONY:clean

clean:

-rm -f $(CXX_OBJECTS) $(DEP_FILES) $(EXE)

github路径（点我下载源码）

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wildcard : 扩展通配符，满足条件的文件名全部展开

notdir ： 去除路径

patsubst ：替换通配符

makefile里的替换引用规则

$(var:a=b) 或 ${var:a=b}

它的含义是把变量var中的每一个值结尾用b替换掉a

$(patsubst %.c,%.o,$(dir) )

obj=$(dir:%.c=%.o)