如何在Makefile中打印变量的名称？

Question

我需要告知用户我的Makefile，他必须设置一个环境变量。

target: dependency
    @if test ! -f $(FILE) ; then\
        echo Vitally needed $(FILE) is missed. ;\
        echo You can change the path to the file by setting $(get_var_name $(FILE)) environment variable.;\
    fi

那么，有没有办法获取$（FILE）的名称（我称之为$（get_var_name ...）make函数），以便用户看到以下输出？

Vitally needed very.very.important.file is missed.
You can change the path to the file by setting FILE environment variable.

Answer 1

像这样：

target: dependency
    @if test ! -f $(FILE) ; then\
        echo Vitally needed $(FILE) is missed. ;\
        echo You can change the path to the file by setting FILE environment variable.;\
    fi

因为FILE变量的名称是FILE。