将'$(VAR)'回显到文件 [英] Echo '$(VAR)' to a file

问题描述

我在Makefile中的一行出现以下问题:

I have the following problem with a line from a Makefile:

echo 'include $(BASE)/Makefile.base' > file

如果我直接将其写入控制台，它会在文件中直接显示"include $(BASE)/Makefile.base"，但是在Makefile中使用它时，$(BASE)总是被替换为空白，我想要它将其从字面上写到文件中.我试图写几种方法，但似乎找不到正确的方法...

If I write this directly into the console it literally prints 'include $(BASE)/Makefile.base' into the file, but when using it within a Makefile $(BASE) always gets replaced with a blank and i want it to literally write that to the file. I tried to write several ways but can't seem the find the right way...

推荐答案

echo 'include $$(BASE)/Makefile.base' > file

名为$的宏(使用$$调用)扩展为$.您经常需要在将成为外壳程序脚本的makefile的段中使用$$，因为make会自动扩展$L，$(NAME)和${NAME}(其中L是一个字母)(如果宏未设置为其他任何值，则返回空字符串.

The macro named $ (invoked using $$) expands to $. You frequently need to use $$ in segments of a makefile that will become shell script, because make expands $L, $(NAME) and ${NAME} (where L is a single-letter) automatically (to an empty string if the macro isn't set to anything else).

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