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main.c
#include
int main(void)
{
printf("Makefile\n");
return 0;
}
Makefile
CFLAGS=-Wall
CC=gcc
main:main.o
$(CC) $(CFLAGS) main.o -o main
main.o:main.c
$(CC) $(CFLAGS) -c main.c -o main.o
clean:
$(RM) main.o
$(RM) main
.PHONY:clean
Makefile的第二种写法:
CFLAGS=-Wall
CC=gcc
main:main.o
clean:
$(RM) main.o
$(RM) main
.PHONY:clean
main.c
#include
extern void fun1(void);
extern void fun2(void);
int main(void)
{
printf("main\n");
fun1();
fun2();
return 0;
}
fun 1.c
#include
void fun1(void)
{
printf("fun1\n");
}
fun2.c
#include
void fun2(void)
{
printf("fun2\n");
}
Makefile
CFLAGS=-Wall
CC=gcc
main:main.o fun1.o cs2/fun2.o
clean:
$(RM) *.o
$(RM) cs2/*.o
$(RM) main
.PHONY:clean
Makefile的另一种写法:
CFLAGS=-Wall
CC=gcc
main:main.o fun1.o cs2/fun2.o
$(CC) $(CFLAGS) $^ -o $@
main.o:main.c
$(CC) $(CFLAGS) -c $^ -o $@
fun1.o:fun1.c
$(CC) $(CFLAGS) -c $^ -o $@
cs2/fun2.o:cs2/fun2.c
$(CC) $(CFLAGS) -c $^ -o $@
clean:
$(RM) *.o
$(RM) cs2/*.o
$(RM) main
.PHONY:clean
其中makefiletest目录下的Makefile为总控Makefile,通过make命令读取总控Makefile,然后总控Makefile在依次读取子目录下的Makefile。
总控Makefile:
CC=gcc
CFLAGS=-Wall -g
SUBDIR=d1 \
d2 \
d3 \
d4 \
main \
obj
OBJS=d1.o d2.o d3.o d4.o main.o
BIN=myapp
OBJDIR=obj
BINDIR=bin
export CFLAGS CC SUBDIR OBJS OBJDIR BIN BINDIR
all:checkdir $(SUBDIR)
checkdir:
mkdir -p $(BINDIR)
//注意:$(SUBDIR)后面应该有依赖文件,否则make -C $@没法执行,或者将目录名全部声明为伪目标
$(SUBDIR):huixian
make -C $@
##是$@,而不能是$(SUBDIR)
huixian:
@echo $(SUBDIR)
@echo begin!
clean:
@$(RM) $(OBJDIR)/*.o
@rm -rf $(BINDIR)
.PHONY:clean
注意:Makefile的注释必须以##开头,并且需顶头写。
main/main.c
#include "../d4/d4.h"
extern void fun2(void);
extern void fun3(void);
extern void fun1(void);
int main(void)
{
fun1();
fun2();
fun3();
fun4();
return 0;
}
main/Makefile
../$(OBJDIR)/main.o:main.c
$(CC) -c $(CFLAGS) $< -o $@
include/myinclude.h
#ifndef __MYINCLUDE_H__
#define __MYINCLUDE_H__
#include
#endif
d1/d1.c
#include "../include/myinclude.h"
void fun1(void)
{
printf("fun1\n");
return ;
}
d1/Makefile
../$(OBJDIR)/d1.o:d1.c
$(CC) $(CFLAGS) -c $< -o $@
d2/d2.c
#include "../include/myinclude.h"
void fun2(void)
{
printf("%s\n","this is fun2");
}
d2/Makefile
../$(OBJDIR)/d2.o:d2.c
$(CC) $(CFLAGS) -c $^ -o $@
d3/d3.c
#include "../include/myinclude.h"
void fun3(void)
{
printf("%s\n","this is fun3");
}
d3/Makefile
../$(OBJDIR)/d3.o:d3.c
$(CC) $(CFLAGS) -c $^ -o $@
d4/d4.h
#ifndef __D4_H__
#define __D4_H__
#define N 4
extern void fun4(void);
#endif
d4/d4.c
#include "../include/myinclude.h"
#include "d4.h"
void fun4(void)
{
printf("this is fun4-->%d\n",N);
}
d4/Makefile
../$(OBJDIR)/d4.o:d4.c
$(CC) $(CFLAGS) -c $< -o $@
make
进入bin/运行myapp
make以后目录的变化
make clean 以后目录的变化