makefile:变量无法正确扩展

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makefile:变量无法正确扩展

2023-03-27 08:09| 来源: 网络整理| 查看: 265

百度翻译此文有道翻译此文问题描述

I am having a problem with this Makefile structure.

make commit.install should create foo.txt and then put it into some folder. However, make doesn't call the target that creates foo.text. This means I have to call make foo.txt to create the file itself and then call make commit.install to copy this over. I think there is a problem with make not expanding variable dependencies.

./common.mk

src.install: ${INSTALLSRC} mkdir -p result for f in ${INSTALLSRC}; do \ cp -a $$f result/.; \ done commit.install: src.install echo "finished" clean: rm -rf result

./inner/nested/GNUmakefile

include ../common.mk include Makefile

./inner/nested/Makefile

SRC=foo.txt foo.txt: echo "hello world" > foo.txt

./inner/common.mk

include ../../common.mk INSTALLSRC=${SRC}

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推荐答案

The problem is that you define INSTALLSRC after the rule that has it as a prerequisite. So when Make evaluates the prerequisite list, the variable is empty, so Make sees no need to build foo.txt. This would have been pretty obvious if you had simplified this collection of makefiles.

The fix is simple; swap the two lines in inner/common.mk:

INSTALLSRC=${SRC} include ../../common.mk

and GNUMakefile:

include Makefile include ../common.mk

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makefile:变量无法正确扩展

makefile:变量无法正确扩展

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