如何根据 grep 结果条件化 makefile？

发布于 2024-08-14 03:14:02 字数 231 浏览 1 评论 0原文

如果在检查工具版本时未找到某个字符串，我正在寻找一种方法来摆脱 makefile。

我要匹配的 grep 表达式是：

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

如果安装了正确版本的 dplus，它将返回匹配行。

如何根据此表达式将条件添加到我的 makefile 中？

原文

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.

The grep expression I'm looking to match is:

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

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

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

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简美 2024-08-21 03:14:02

这是 GNU Make 中的另一种工作方式：

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
    ...

这个目标可以是真实的目标，也可以只是真实目标所依赖的假目标。

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
    ...

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

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挽心 2024-08-21 03:14:02

这是一种方法：

.PHONY: check_dplus

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

如果 grep 找不到匹配项，它应该给出

make: *** [check_dplus] Error 1

然后让您的其他目标依赖于 check_dplus 目标。

Here is one way:

.PHONY: check_dplus

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

If grep finds no match, it should give

make: *** [check_dplus] Error 1

Then have your other targets depend on the check_dplus target.

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失眠症患者 2024-08-21 03:14:02

如果这是 gnu make，您可以

 your-target: $(objects)
     ifeq (your-condition)
         do-something
     else
         do-something-else
     endif

参见此处 Makefile 条件

如果你的 make 不支持条件，你可以随时这样做

 your-target:
     dplus -VV | grep -q "build date and time: Nov  1 2009 19:31:28" || $(MAKE) -s another-target; exit 0
     do-something

 another-target:
     do-something-else

If this is gnu make, you can do

 your-target: $(objects)
     ifeq (your-condition)
         do-something
     else
         do-something-else
     endif

See here for Makefile contionals

If your make doesn't support conditionals, you can always do

 your-target:
     dplus -VV | grep -q "build date and time: Nov  1 2009 19:31:28" || $(MAKE) -s another-target; exit 0
     do-something

 another-target:
     do-something-else

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