[ make ] Makefile: 多个all目标的处理 和 变量目标的处理

jielong.lin@xmbuilder03:~$ vim  makefile

TEST_VAR=1$(TEST_VAR):    echo $@TEST_VAR=2$(TEST_VAR):    echo $@.PHONY: allall:    echo all-1all:    echo all-2

不带目标，默认执行第一个目标（不一定是all）
jielong.lin@xmbuilder03:~$
jielong.lin@xmbuilder03:~$ make
makefile:18: warning: overriding commands for target `all'
makefile:15: warning: ignoring old commands for target `all'
echo 1
1

带目标all，但此时有两个目标all，make选择最后面的目标all

jielong.lin@xmbuilder03:~$ make all
makefile:18: warning: overriding commands for target `all'
makefile:15: warning: ignoring old commands for target `all'
echo all-2
all-2

带变量目标2, 精准地执行目标2
jielong.lin@xmbuilder03:~$ make 2
makefile:18: warning: overriding commands for target `all'
makefile:15: warning: ignoring old commands for target `all'
echo 2
2

带变量目标1，精准地执行目标1
jielong.lin@xmbuilder03:~$ make 1
makefile:18: warning: overriding commands for target `all'
makefile:15: warning: ignoring old commands for target `all'
echo 1
1