如何根据grep结果对makefile进行条件化? [英] How to conditionalize a makefile based upon grep results?

问题描述

如果要在检查工具的版本时找不到某个字符串，我正在寻找一种从makefile中退出的方法.

I'm looking for a way to bail out of a makefile if a certain string is not found when checking the version of a tool.

我要匹配的grep表达式是:

The grep expression I'm looking to match is:

dplus -VV | grep 'build date and time: Nov  1 2009 19:31:28'

如果已安装正确版本的dplus，则返回匹配行.

which returns a matching line if the proper version of dplus is installed.

如何根据此表达式将条件条件放入我的Makefile中?

How do I work a conditional into my makefile based upon this expression?

推荐答案

这是在GNU Make中工作的另一种方式:

Here's another way that works in GNU Make:

DPLUSVERSION = $(shell dplus -VV | grep 'build date and time: Nov  1 2009 19:31:28')

target_of_interest: do_things do_things_that_uses_dplus

do_things:
    ...


do_things_that_uses_dplus:
ifeq ($(DPLUSVERSION),)
    $(error proper version of dplus not installed)
endif
    ...

该目标可以是真实的目标，也可以是真实目标所依赖的PHONY目标.

This target can be something real, or just a PHONY target on which the real ones depend.

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