Makefile 的写作思路小结：
1）伪目标
2）命令（CC MKDIR...)
3）目录（绝对路径、相对路径、临时目录、条件加入的目录...)
4）实际目标（对空目标分开处理）
5）include（写在all之下）
6）创建目录（对写好的目录加上条件并创建、同时可选择加入依赖中）
7）实际目标的生成方法
8）完善依赖关系
9）头文件的查找与链接
10）库文件依赖关系的裁剪与添加
11）自动生成依赖关系并修改加入前缀（经典六句话）
12）提取公共部分至make.rule文件中并修改模块生成文件的路径
13）各个子模块的目标库文件的写入与删除
14）编写总体Makefile放在指定的build目录中
注：一下程序都来源于《专业嵌入式软件开发》一书，李云著
- .PHONY:all clean
-
-
CC = gcc
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RM = rm
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RMFLAGS = -rf
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MKDIR = mkdir
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AR = ar
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ARFLAGS = crs
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-
DIR_OBJS = objs
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DIR_DEPS = deps
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DIR_LIBS = ../../../libs
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DIR_EXES = ../../../exes
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DIRS = $(DIR_OBJS) $(DIR_DEPS) $(DIR_LIBS) $(DIR_EXES)
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RMS = $(DIR_DEPS) $(DIR_OBJS)
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-
LIB = libfoo.a
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ifneq ("$(LIB)","")
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LIB := $(addprefix $(DIR_LIBS)/,$(LIB))
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RMS += $(LIB)
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endif
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EXE = complicated
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ifneq ("$(EXE)","")
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EXE := $(addprefix $(DIR_EXES)/,$(EXE))
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RMS += $(EXE)
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endif
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SRCS = $(wildcard *.c)
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OBJS = $(SRCS:.c=.o)
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OBJS := $(addprefix $(DIR_OBJS)/,$(OBJS))
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DEPS = $(SRCS:.c=.dep)
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DEPS := $(addprefix $(DIR_DEPS)/,$(DEPS))
-
-
#如下写法只是在判断DIR_EXES这个变量是不是空,而不是../../../
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#ifeq("$(DIR_EXES)","")
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-
ifeq ("$(wildcard $(DIR_EXES))","")
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DEP_DIR_EXES := $(DIR_EXES)
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endif
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ifeq ("$(wildcard $(DIR_OBJS))","")
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DEP_DIR_OBJS := $(DIR_OBJS)
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endif
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ifeq ("$(wildcard $(DIR_DEPS))","")
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DEP_DIR_DEPS := $(DIR_DEPS)
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endif
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ifeq ("$(wildcard $(DIR_LIBS))","")
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DEP_DIR_LIBS := $(DIR_LIBS)
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endif
-
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all:$(EXE) $(LIB)
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ifneq ($(MAKECMDGOALS),clean)
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include $(DEPS)
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endif
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$(DIRS):
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$(MKDIR) $@
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$(EXE): $(DEP_DIR_EXES) $(OBJS)
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$(CC) -o $@ $(filter %.o,$^)
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$(LIB): $(DEP_DIR_LIBS) $(OBJS)
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$(AR) $(ARFLAGS) $@ $(filter %.o,$^)
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$(DIR_OBJS)/%.o: $(DEP_DIR_OBJS) %.c
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$(CC) -o $@ -c $(filter %.c,$^)
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$(DIR_DEPS)/%.dep: $(DEP_DIR_DEPS) %.c
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@echo "Creating $@ ..."
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@set -e ; \
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$(RM) $(RMFLAGS) $@.tmp ; \
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$(CC) -E -MM $(filter %.c,$^) > $@.tmp ; \
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sed 's,\(.*\)\.o[ :]*,objs/\1.o $@: ,g' < $@.tmp > $@ ; \
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$(RM) $(RMFLAGS) $@.tmp
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clean:
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$(RM) $(RMFLAGS) $(RMS)
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