制作:使用正则表达式检测平台 [英] Make: detect platform with regex

问题描述

我正在编写一个查看uname输出的makefile，但是由于某种原因，uname系统名称过于具体，例如它是CYGWIN-NT-1.2.3.我需要将其与正则表达式进行比较.

I'm writing a makefile that looks at the uname output, but for some reason the uname system name is too specific e.g. it is CYGWIN-NT-1.2.3. What I need is to compare that to a regular expression.

当前我只能检测到特定的字符串，例如

Currently I can detect only specific strings e.g.

ifeq (${value},CYGWIN-NT-4.5)
   do something
elif

我如何与正则表达式进行比较，例如CYGWIN *?

How can I compare with a regex e.g. CYGWIN*?

推荐答案

您不能在GNU make中使用正则表达式(不使用 shell 或类似的调用处理正则表达式的shell脚本).

You can't use regular expressions in GNU make (without using shell or similar to invoke a shell script that handles regex's).

但是您不需要正则表达式来进行比较，这只是看值是否以给定的字符串开头.您可以使用过滤器功能:

But you don't need regex's for the comparison you are looking for, which is just to see if the value starts with a given string. You can use the filter function:

ifneq (,$(filter CYGWIN%,$(value)))
  ...on cygwin...
endif

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