在makefile中转义 [英] Escaping in makefile

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本文介绍了在makefile中转义的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

  M_ARCH:= $(shell g ++  - dumpmachine | awk'{split($ 1,a, - ); print a [1]}')



你知道为什么吗我想它与逃避有关,但是什么和在哪里?

解决方案

这是美元符号,在makefile中你会有键入 $$ 以获取单个美元符号:

  M_ARCH: = $(shell g ++ -dumpmachine | awk'{split($$ 1,a, - ); print a [1]}')


I'm trying to do this in a makefile and it fails horribly:

M_ARCH := $(shell g++ -dumpmachine | awk '{split($1,a,"-");print a[1]}')

do you know why? I guess it has to do with escaping, but what and where?

解决方案

It's the dollar sign, in makefiles you'll have to type $$ to get a single dollar sign:

M_ARCH := $(shell g++ -dumpmachine | awk '{split($$1,a,"-");print a[1]}')

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