Makefile规则和If语句 - 如何？ [英] Makefile Rules and If Statements -- How?

问题描述

我是Makefiles的新手所以请耐心等待。

I'm new to Makefiles so please bear with me.

我需要修改一个Makefile，这样一些规则会根据变量调用不同的实用程序。

I need to modify a Makefile so some rules call different utilities depending on a variable.

现在，规则如下：

ci:
    [shell syntax for tool (A)]

但现在我需要ci才能有所不同语法取决于变量。所以我在文件的顶部定义了一个全局变量：

But now I need ci to have a different syntax depending on the variable. So I define a global variable at the top of the file:

TOOL = toolA

或

TOOL = toolB

理想情况下，我喜欢的是这样的，但显然它不起作用：

Ideally what I'd like is something like this, but obviously it doesn't work:

ifeq ($TOOL, toolA)
    ci:
        [syntax for tool (A)]
else
    ci:
        [syntax for tool (B)
endif

有没有人知道正确实施这样的事情的最佳方式？

Does anyone know the best way to implement something like this properly?

谢谢!!

编辑：工具语法比一行更复杂。有时它的多行而不仅仅是toolA args等。抱歉造成混淆！

EDIT: The tool syntax is more complicated than one line. Sometimes its multiple lines and not just "toolA args etc etc". Sorry for the confusion!

推荐答案

你只是遗漏了一些括号：

You're just missing some parentheses:

ifeq ($(TOOL), toolA)
...

PS 您可以使条件稍微收紧（并删除一点冗余）：

P.S. You can make the conditional a little tighter (and remove a little redundancy):

ci:
ifeq ($(TOOL), toolA)
    [syntax for tool (A)]
else
    [syntax for tool (B)
endif

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