如何在makefile中获取shell环境变量? [英] How to get a shell environment variable in a makefile?

问题描述

在外壳中，当我输入

echo $demoPath

它打印

/usr/local/demo

如何在生成文件中获取此变量$demoPath的值?

How can I get the value of this variable $demoPath in a makefile?

推荐答案

如果已导出环境变量:

export demoPath=/usr/local/demo

您可以简单地在makefile中按名称引用它(make导入您已设置的所有环境变量):

you can simply refer to it by name in the makefile (make imports all the environment variables you have set):

DEMOPATH = ${demoPath}    # Or $(demoPath) if you prefer.

如果您还没有导出环境变量，则除非您导出了环境变量，否则除非在命令行中明确传递它，否则无法访问它.

If you've not exported the environment variable, it is not accessible until you do export it, or unless you pass it explicitly on the command line:

make DEMOPATH="${demoPath}" …

如果使用的是C Shell派生，请用setenv demoPath /usr/local/demo代替export命令.

If you are using a C shell derivative, substitute setenv demoPath /usr/local/demo for the export command.

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