GNU Make:如何加入列表并将其与分隔符分开? [英] GNU Make: how to join list and separate it with separator?

问题描述

我有这个:

FOO = foo1 foo2 ... fooN

，并希望将所有这些字符串连接起来，并用例如冒号分隔它:

and want to get join all these string and separate it with, for instance, colong:

foo1:foo2:foo3:...:fooN

如何在不使用外部UNIX工具的情况下在GNU Make中做到这一点?

How to do this in GNU Make, without using external UNIX tools?

推荐答案

请参见下面的代码.

# A literal space.
space :=
space +=

# Joins elements of the list in arg 2 with the given separator.
#   1. Element separator.
#   2. The list.
join-with = $(subst $(space),$1,$(strip $2))

用法:

FOO = foo1 foo2 ... fooN

COLON_SEPARATED_FOO := $(call join-with,:,$(FOO))

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