makefile 笔记(下)
22. 建一个名为huge的项目，组织架构如下图，引入了静态库的build，其中ar -crs：ar是用来管理档案文件的，在嵌入式系统中主要是用来对静态库进行管理的，c用于创建一个档案文件，r表示向档案文件中增加文件，t用于显示档案文件中存在哪些文件
MKDIR = mkdir
RM = rm
RMFLAGS = -fr
CC = gcc
AR = ar
ARFLAGS = crs
DIR_OBJS = objs
DIR_EXES = ../../../build/exes
DIR_DEPS = deps
DIR_LIBS = ../../../build/libs
DIRS = $(DIR_DEPS) $(DIR_OBJS) $(DIR_EXES) $(DIR_LIBS)
RMS = $(DIR_OBJS) $(DIR_DEPS)
EXE =
ifneq ($(EXE), "")
EXE := $(addprefix $(DIR_EXES)/,$(EXE))
RMS += $(EXE)
endif
LIB = libfoo.a
ifneq ($(LIB), "")
LIB := $(addprefix $(DIR_LIBS)/, $(LIB))
RMS += $(LIB)
endif
SRCS = $(wildcard *.c)
OBJS = $(SRCS:.c=.o)
OBJS := $(addprefix $(DIR_OBJS)/, $(OBJS))
DEPS = $(SRCS:.c=.dep)
DEPS := $(addprefix $(DIR_DEPS)/, $(DEPS))
ifneq ($(EXE), "")
all: $(EXE)
endif
ifneq ($(LIB), "")
all: $(LIB)
endif
ifeq ("$(wildcard $(DIR_DEPS))", "")
DEPS_DIR_DEPS := $(DIR_DEPS)
endif
ifneq ($(MAKECMDGOALS), clean)
-include $(DEPS)
endif
$(DIRS):
$(MKDIR) $@
$(EXE): $(DIR_EXES) $(OBJS)
$(CC) -o $@ $(filter %.o,$^)
$(LIB): $(DIR_LIBS) $(OBJS)
$(AR) $(ARFLAGS) $@ $(filter %.o,$^)
$(DIR_OBJS)/%.o: $(DIR_OBJS) %.c
$(CC) -o $@ -c $(filter %.c,$^)
$(DIR_DEPS)/%.dep: $(DEPS_DIR_DEPS) %.c
@set -e; \
echo "Making $@ ..."; \
$(RM) $(RMFLAGS) [email protected]; \
$(CC) -E -MM $(filter %.c,$^) > [email protected]; \
set 's,\(.*\)\.o[ :]*,objs/\1.o $@: ,g' < [email protected] > $@; \
$(RM) $(RMFLAGS) [email protected]
clean:
$(RM) $(RMFLAGS) $(RMS)
23. 对22，我们需要抽象和拆分，这样才能为以后复用和维护做好应有的准备，我们把22中可以提炼公共的部分进行修改后放到build目录下的make.rule，把foo特有的部分替换掉原有的makefile，然后通过共用make.rule来达到抽象和拆分的效果，这里引入了一个取名为ROOT环境变量，更改后如下：
make.rule
/////////////////
.PHONY: all clean
MKDIR = mkdir
RM = rm
RMFLAGS = -fr
CC = gcc
AR = ar
ARFLAGS = crs
DIR_OBJS = objs
DIR_EXES = $(ROOT)/build/exes
DIR_DEPS = deps
DIR_LIBS = $(ROOT)/build/libs
DIRS = $(DIR_DEPS) $(DIR_OBJS) $(DIR_EXES) $(DIR_LIBS)
RMS = $(DIR_OBJS) $(DIR_DEPS)
ifneq ($(EXE), "")
EXE := $(addprefix $(DIR_EXES)/,$(EXE))
RMS += $(EXE)
endif
ifneq ($(LIB), "")
LIB := $(addprefix $(DIR_LIBS)/, $(LIB))
RMS += $(LIB)
endif
SRCS = $(wildcard *.c)
OBJS = $(SRCS:.c=.o)
OBJS := $(addprefix $(DIR_OBJS)/, $(OBJS))
DEPS = $(SRCS:.c=.dep)
DEPS := $(addprefix $(DIR_DEPS)/, $(DEPS))
ifneq ($(EXE), "")
all: $(EXE)
endif
ifneq ($(LIB), "")
all: $(LIB)
endif
ifeq ("$(wildcard $(DIR_DEPS))", "")
DEPS_DIR_DEPS := $(DIR_DEPS)
endif
ifneq ($(MAKECMDGOALS), clean)
-include $(DEPS)
endif
$(DIRS):
$(MKDIR) $@
$(EXE): $(DIR_EXES) $(OBJS)
$(CC) -o $@ $(filter %.o,$^)
$(LIB): $(DIR_LIBS) $(OBJS)
$(AR) $(ARFLAGS) $@ $(filter %.o,$^)
$(DIR_OBJS)/%.o: $(DIR_OBJS) %.c
$(CC) -o $@ -c $(filter %.c,$^)
$(DIR_DEPS)/%.dep: $(DEPS_DIR_DEPS) %.c
@set -e; \
echo "Making $@ ..."; \
$(RM) $(RMFLAGS) [email protected]; \
$(CC) -E -MM $(filter %.c,$^) > [email protected]; \
set 's,\(.*\)\.o[ :]*,objs/\1.o $@: ,g' < [email protected] > $@; \
$(RM) $(RMFLAGS) [email protected]
clean:
$(RM) $(RMFLAGS) $(RMS)
makefile
//////////////
EXE =
LIB = libfoo.a
include $(ROOT)/build/make.rule
设置ROOT环境变量必须到最外层那个huge目录，然后按以下方式执行command
// screen content begin
$export ROOT=`pwd`
// screen contend end
24. 最后想给出一个模板，不多作解释，并想感谢作者李云老师提供的public文档，让我受益匪浅
. 
~/huge/build
makefile
//////////////
.PHONY: all clean
DIRS = $(ROOT)/source/foo/src \
$(ROOT)/source/bar/src \
$(ROOT)/source/huge/src
RM = rm
RMFLAGS = -fr
RMS = $(ROOT)/build/exes $(ROOT)/build/libs
all:
@set -e; \
for dir in $(DIRS); \
do \
cd $$dir && $(MAKE); \
done
@echo ""
@echo ":-) Completed"
@echo ""
clean:
@set -e; \
for dir in $(DIRS; \
do \
cd $$dir && $(MAKE) clean; \
done
$(RM) $(RMFLAGS) $(RMS)
@echo ""
@echo ":-) Completed"
@echo ""
make.rule
/////////////////
.PHONY: all clean
MKDIR = mkdir
RM = rm
RMFLAGS = -fr
CC = gcc
AR = ar
ARFLAGS = crs
DIR_OBJS = objs
DIR_EXES = $(ROOT)/build/exes
DIR_DEPS = deps
DIR_LIBS = $(ROOT)/build/libs
DIRS = $(DIR_DEPS) $(DIR_OBJS) $(DIR_EXES) $(DIR_LIBS)
RMS = $(DIR_OBJS) $(DIR_DEPS)
ifneq ($(EXE), "")
EXE := $(addprefix $(DIR_EXES)/,$(EXE))
RMS += $(EXE)
endif
ifneq ($(LIB), "")
LIB := $(addprefix $(DIR_LIBS)/, $(LIB))
RMS += $(LIB)
endif
SRCS = $(wildcard *.c)
OBJS = $(SRCS:.c=.o)
OBJS := $(addprefix $(DIR_OBJS)/, $(OBJS))
DEPS = $(SRCS:.c=.dep)
DEPS := $(addprefix $(DIR_DEPS)/, $(DEPS))
ifneq ($(EXE), "")
all: $(EXE)
endif
ifneq ($(LIB), "")
all: $(LIB)
endif
ifeq ("$(wildcard $(DIR_DEPS))", "")
DEPS_DIR_DEPS := $(DIR_DEPS)
endif
ifneq ($(MAKECMDGOALS), clean)
include $(DEPS)
endif
ifneq ($INC_DIRS), "")
INC_DIRS := $(strip $(INC_DIRS))
INC_DIRS := $(addprefix -I, $(INC_DIRS))
endif
ifneq ($(LINK_LIBS), "")
LINK_LIBS := $(strip $(LINK_LIBS))
LINK_LIBS := $(addprefix -l, $(LINK_LIBS))
endif
$(DIRS):
$(MKDIR) $@
$(EXE): $(DIR_EXES) $(OBJS)
$(CC) -L$(DIR_LIBS) -o $@ $(filter %.o,$^) $(LINK_LIBS)
$(LIB): $(DIR_LIBS) $(OBJS)
$(AR) $(ARFLAGS) $@ $(filter %.o,$^)
$(DIR_OBJS)/%.o: $(DIR_OBJS) %.c
$(CC) $(INC_DIRS) -o $@ -c $(filter %.c,$^)
$(DIR_DEPS)/%.dep: $(DEPS_DIR_DEPS) %.c
@set -e; \
echo "Making $@ ..."; \
$(RM) $(RMFLAGS) [email protected]; \
$(CC) $(INC_DIRS) -E -MM $(filter %.c,$^) > [email protected]; \
set 's,\(.*\)\.o[ :]*,objs/\1.o $@: ,g' < [email protected] > $@; \
$(RM) $(RMFLAGS) [email protected]
clean:
$(RM) $(RMFLAGS) $(RMS)
~/huge/source/bar/src
makefile
///////////////
EXE =
LIB = libbar.a
INC_DIRS = $(ROOT)/source/bar/inc
LINK_LIBS =
include $(ROOT)/build/make.rule
~/huge/source/foo/src
makefile
//////////////
EXE =
LIB = libfoo.a
INC_DIRS = $(ROOT)/source/foo/inc
LINK_LIBS =
include $(ROOT)/build/make.rule
~/huge/source/huge/src
EXE = huge.exe
LIB =
INC_DIRS = $(ROOT)/source/foo/inc \
$(ROOT)/source/bar/inc
LINK_LIBS = foo bar
include $(ROOT)/build/make.rule
如果需要全部build，则可以在~/huge/build目录下进行make，该makefile已经遍历了所有的从静态库的build到最后exe的build的过程，运用了MAKE特殊变量(表示的是make命令名是什么)。当然，也可以分头build，都在各自的src目录下的makefile。