Linux内核Makefile用于日常工程

最新推荐文章于 2022-11-01 18:50:03 发布

曾祥锋

最新推荐文章于 2022-11-01 18:50:03 发布

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分类专栏： linux内核文章标签： Makefile 多文件Makefile Makefile工程模板

本文链接：https://blog.youkuaiyun.com/weixin_43403168/article/details/88937430

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本文介绍了一个基于Linux内核的Makefile配置实例，通过多级Makefile组织项目，实现源代码模块化编译。该实例定义了全局编译参数，并通过递归调用Makefile的方式实现了各子目录下源文件的编译。

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Linux内核Makefile用于日常工程

我当前的目录结构：
zxf@zxf-virtual-machine:com_make$ ls
a b c d include main.c Makefile Makefile.build
zxf@zxf-virtual-machine:com_make$ tree
.
├── a
│ ├── a.c
│ └── Makefile
├── b
│ ├── b.c
│ └── Makefile
├── c
│ ├── c.c
│ └── Makefile
├── d
│ ├── d.c
│ └── Makefile
├── include
│ ├── a.h
│ ├── b.h
│ ├── c.h
│ └── d.h
├── main.c
├── Makefile
└── Makefile.build

5 directories, 15 files
zxf@zxf-virtual-machine:com_make$

顶层目录下的Makefile 和Makefile.build

zxf@zxf-virtual-machine:com_make$ cat Makefile

# 定义全局变量
CROSS_COMPILE = 
AS		= $(CROSS_COMPILE)as
LD		= $(CROSS_COMPILE)ld
CC		= $(CROSS_COMPILE)gcc
CPP		= $(CC) -E
AR		= $(CROSS_COMPILE)ar
NM		= $(CROSS_COMPILE)nm

STRIP		= $(CROSS_COMPILE)strip
OBJCOPY		= $(CROSS_COMPILE)objcopy
OBJDUMP		= $(CROSS_COMPILE)objdump
# 将全局变量导出，使其能够在其它文件中引用 
export AS LD CC CPP AR NM
export STRIP OBJCOPY OBJDUMP
# 指定编译选项
CFLAGS := -Wall -O2 -g
CFLAGS += -I $(shell pwd)/include -I /usr/include/
# 指定链接库
LDFLAGS := 

# 将符号导出
export CFLAGS LDFLAGS

# 获得当前工程的顶层路经,并导出
TOPDIR := $(shell pwd)
export TOPDIR

# 定义最终目标文件名
TARGET := main

# 定义顶层目录下的文件及目录结构
obj-y += main.o
obj-y += a/
obj-y += b/
obj-y += c/
obj-y += d/

# -C 指定目录；-f 指定该文件为Makefile 
# 根据build-in.o 进行编译
# 
all:
	make -C ./ -f $(TOPDIR)/Makefile.build
	$(CC) $(LDFLAGS) -o $(TARGET) built-in.o

# 清除中间文件 
clean:
	rm -f $(shell find -name "*.o")
	rm -f $(TARGET)
distclean:
	rm -f $(shell find -name "*.o")
	rm -f $(shell find -name "*.d")
	rm -f $(TARGET)
zxf@zxf-virtual-machine:com_make$ cat Makefile.build 
PHONY := __build
__build:


obj-y :=
subdir-y :=

include Makefile

# obj-y := a.o b.o c/ d/
# $(filter %/, $(obj-y))   : c/ d/
# __subdir-y  : c d
# subdir-y    : c d
__subdir-y	:= $(patsubst %/,%,$(filter %/, $(obj-y)))
subdir-y	+= $(__subdir-y)

# c/built-in.o d/built-in.o
subdir_objs := $(foreach f,$(subdir-y),$(f)/built-in.o)

# a.o b.o
cur_objs := $(filter-out %/, $(obj-y))
dep_files := $(foreach f,$(cur_objs),.$(f).d)
dep_files := $(wildcard $(dep_files))

ifneq ($(dep_files),)
	include $(dep_files)
endif


PHONY += $(subdir-y)


__build : $(subdir-y) built-in.o

$(subdir-y):
	make -C $@ -f $(TOPDIR)/Makefile.build

built-in.o : $(cur_objs) $(subdir_objs)
	$(LD) -r -o $@ $^

dep_file = .$@.d

%.o : %.c
	$(CC) $(CFLAGS) -Wp,-MD,$(dep_file) -c -o $@ $<
				
.PHONY : $(PHONY)
zxf@zxf-virtual-machine:com_make$

其它目录的内容及结构

zxf@zxf-virtual-machine:com_make$ ls
a  b  c  d  include  main.c  Makefile  Makefile.build
zxf@zxf-virtual-machine:com_make$ cd a/
zxf@zxf-virtual-machine:a$ cat a.c
#include "a.h"
#include "stdio.h"
void fun_a(void)
{
	printf("fun_a A =  %d\n",A);
}
zxf@zxf-virtual-machine:a$ cat Makefile 
obj-y += a.o

zxf@zxf-virtual-machine:a$ cd ..
zxf@zxf-virtual-machine:com_make$ ls
a  b  c  d  include  main.c  Makefile  Makefile.build
zxf@zxf-virtual-machine:com_make$ cd b/
zxf@zxf-virtual-machine:b$ ls
b.c  Makefile
zxf@zxf-virtual-machine:b$ cat b.c
#include "stdio.h"
#include "b.h"

void fun_b(void)
{
	printf("fun_b B = %d\n",B);
}

zxf@zxf-virtual-machine:b$ cat Makefile 
obj-y += b.o
zxf@zxf-virtual-machine:b$ ls
b.c  Makefile
zxf@zxf-virtual-machine:b$ cd ..
zxf@zxf-virtual-machine:com_make$ ls
a  b  c  d  include  main.c  Makefile  Makefile.build
zxf@zxf-virtual-machine:com_make$ cd include/
zxf@zxf-virtual-machine:include$ ls
a.h  b.h  c.h  d.h
zxf@zxf-virtual-machine:include$ cat a.h 
#ifndef _A_H_
#define _A_H_

#define A 1


#endif
zxf@zxf-virtual-machine:include$ cat b.h 
#ifndef _B_H_
#define _B_H_

#define B 1


#endif

zxf@zxf-virtual-machine:com_make$ ls
a  b  c  d  include  main.c  Makefile  Makefile.build
zxf@zxf-virtual-machine:com_make$ make
make -C ./ -f /home/zxf/Desktop/farsightworkspace/code/com_make/Makefile.build
make[1]: Entering directory `/home/zxf/Desktop/farsightworkspace/code/com_make'
make -C a -f /home/zxf/Desktop/farsightworkspace/code/com_make/Makefile.build
make[2]: Entering directory `/home/zxf/Desktop/farsightworkspace/code/com_make/a'
gcc -Wall -O2 -g -I /home/zxf/Desktop/farsightworkspace/code/com_make/include -I /usr/include/ -Wp,-MD,.a.o.d -c -o a.o a.c
ld -r -o built-in.o a.o
make[2]: Leaving directory `/home/zxf/Desktop/farsightworkspace/code/com_make/a'
make -C b -f /home/zxf/Desktop/farsightworkspace/code/com_make/Makefile.build
make[2]: Entering directory `/home/zxf/Desktop/farsightworkspace/code/com_make/b'
gcc -Wall -O2 -g -I /home/zxf/Desktop/farsightworkspace/code/com_make/include -I /usr/include/ -Wp,-MD,.b.o.d -c -o b.o b.c
ld -r -o built-in.o b.o
make[2]: Leaving directory `/home/zxf/Desktop/farsightworkspace/code/com_make/b'
make -C c -f /home/zxf/Desktop/farsightworkspace/code/com_make/Makefile.build
make[2]: Entering directory `/home/zxf/Desktop/farsightworkspace/code/com_make/c'
gcc -Wall -O2 -g -I /home/zxf/Desktop/farsightworkspace/code/com_make/include -I /usr/include/ -Wp,-MD,.c.o.d -c -o c.o c.c
ld -r -o built-in.o c.o
make[2]: Leaving directory `/home/zxf/Desktop/farsightworkspace/code/com_make/c'
make -C d -f /home/zxf/Desktop/farsightworkspace/code/com_make/Makefile.build
make[2]: Entering directory `/home/zxf/Desktop/farsightworkspace/code/com_make/d'
gcc -Wall -O2 -g -I /home/zxf/Desktop/farsightworkspace/code/com_make/include -I /usr/include/ -Wp,-MD,.d.o.d -c -o d.o d.c
ld -r -o built-in.o d.o
make[2]: Leaving directory `/home/zxf/Desktop/farsightworkspace/code/com_make/d'
gcc -Wall -O2 -g -I /home/zxf/Desktop/farsightworkspace/code/com_make/include -I /usr/include/ -Wp,-MD,.main.o.d -c -o main.o main.c
ld -r -o built-in.o main.o a/built-in.o b/built-in.o c/built-in.o d/built-in.o
make[1]: Leaving directory `/home/zxf/Desktop/farsightworkspace/code/com_make'
gcc  -o main built-in.o
zxf@zxf-virtual-machine:com_make$