Joining elements of a list in GNU Make

makefile

Solution

You can use the `$(subst)` command, combined with a little trick to get a variable that has a value of a single space:

p = /usr /usr/share /lib
noop=
space = $(noop) $(noop)

all:
        @echo $(subst $(space),:,$(p))

Problem

In my makefile I have a variable with a list of directories, like this: ``` DIRS = /usr /usr/share/ /lib ``` Now, I need to create PATH variable from it, which is basically the same, but uses semicolon as a separator: ``` PATH = /usr:/usr/share/:/lib ``` How do I do that? I mean, how do I join elements of DIRS list with semicolons, instead of spaces?

Original source

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