nmake附加到变量 [英] nmake appending to variables

问题描述

• 实用程序:NMake
• 平台:Windows 7

我有以下Makefile

I have the following Makefile

FILE = $(shell) *.c
FILE += $(shell) *.cpp

exec:
    @echo $(FILE)

这与make完美配合.这会引发以下 nmake 错误

This works perfectly fine with make. This throws up the following error with nmake

makefile(2) : fatal error U1036: syntax error : too many names to left of '='
Stop.

可能是什么原因?

没有一行

FILE += $(shell) *.cpp

nmake可以正常工作.

nmake works perfectly fine.

推荐答案

+ = 语法是 make 或原始的AT& T make .

The += syntax is a GNU Make extension that was pioneered in Sun's make in the late 80s. It is not part of the syntax for POSIX standard make, or the original AT&T make.

如果使用扩展名，则在切换到不支持扩展名的系统时会被抓住.您要么需要重做一些事情，要么必须坚持原来的系统.

If you use extensions, you get caught when you switch to a system that doesn't support them. You either have to rework things (hard) or stick with the original system.

一种修改文件以使其与 nmake 一起使用的方法可能是:

One way to modify the file to work with nmake is probably:

FILE1 = $(shell) *.c
FILE2 = $(shell) *.cpp
FILE  = $(FILE1) $(FILE2)

exec:
    @echo $(FILE)

或者，假设未定义宏 shell ，甚至:

Or, given that the macro shell is not defined, even:

FILE1 = *.c
FILE2 = *.cpp
FILE  = $(FILE1) $(FILE2)

exec:
    @echo $(FILE)

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