放飛思想

lxq@lxq:~/tmp$ tree
.
|-- Makefile
|-- bin
|   `-- Makefile
|-- hello
|   |-- Makefile
|   |-- hello
|   `-- hello.c
`-- tmp

3 directories, 5 files


cat Makefile
SRCBASE := $(shell pwd) #獲取當(dāng)前目錄
ELEASEDIR := $(shell (cd $(SRCBASE)/.. && pwd -P))
print:
        echo ${ELEASEDIR}
install: all
        install -d ${ELEASEDIR}/tmp
        $(MAKE) -C ./hello clean #切換到hello目錄執(zhí)行clean目標(biāo)
        $(MAKE) -C ./hello hello #切換到hello目錄執(zhí)行hello目標(biāo)
        $(MAKE) -C ./hello $@ #切換到hello目錄執(zhí)行install目標(biāo)
all clean:
ifneq ($(wildcard hell),) #如果有hell這個文件就執(zhí)行里面的動作
        $(MAKE) -C ./bin $@ #切換到hello目錄執(zhí)行all\clean目標(biāo)
endif
.PHONY: all clean install

cat hello/Makefile
clean:
ifneq ($(wildcard hello),)
        rm hello
endif
hello:
        gcc -o hello hello.c
install:
        -cp hello ../bin/

cat hello/hello.c
#include <stdio.h>
int main()
{
        printf("hello");
        exit(0);
}