在 makefile 中逃跑

我试图在 makefile 中完成这个操作，但是失败得很可怕:

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

你知道为什么吗? 我想这和逃跑有关，但是是什么，在哪里？

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小开

最佳答案

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]}')

小开

Make is quite lispy when you get down to it. Here's a non-awk version that does the same thing:

space := $() #


M_ARCH := $(firstword $(subst -,$(space),$(shell g++ -dumpmachine)))


all:
$(info $(M_ARCH))