在GNU makefile中的最后一个单词之前获取单词 [英] Get word before the last word inside GNU makefile

问题描述

我需要从 $(MAKEFILE_LIST)中提取出最后一个单词之前的单词.

I need to extract the word before the last from $(MAKEFILE_LIST).

到目前为止，我无法提出比这种怪诞更好的东西:

So far I could not come up with anything better than this kind of monstrosity:

LIST := a b c

LAST_WORD_INDEX = $(words $(LIST))
BEFORE_LAST := $(word $(shell echo $(LAST_WORD_INDEX) - 1 | bc),$(LIST))
$(info word before last is $(BEFORE_LAST))

运行时:

word before last is b
make: *** No targets.  Stop.

结果是正确的，但是有没有更优雅，更理智的方法来实现相同的目标?

The result is correct, but is there more elegant and sane way to achieve the same?

推荐答案

$(words $ {LIST})将为您提供最后一个按钮的索引>单词，如果您将元素放在 LIST 之前.

$(words ${LIST}) will give you the index of the last-but-one word if you prepend an element to LIST.

BEFORE_LAST := $(word $(words ${LIST}),1st ${LIST})

注意那里的 1st .

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