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%reldir% in gnulib's Makefile.am

From: Vivien Kraus
Subject: %reldir% in gnulib's Makefile.am
Date: Sun, 18 Feb 2018 16:10:54 +0100


I would like to use gnulib for my autotools-based project.  However,
when I want to link the gnulib in my program:

    SUBDIRS = lib
    bin_PROGRAMS = test
    test_LDADD = lib/libgnu.la

make cannot re-build lib/libgnu.la since it is defined in
lib/Makefile.am as the target "libgnu.la" and I have to use a recursive
make rule to rebuild it:

    SUBDIRS = lib
    bin_PROGRAMS = test
    test_LDADD = lib/libgnu.la
        cd lib && $(MAKE) libgnu.la

When I do:

    $ make -j 4

lib/libgnu.la is built twice in parallel (once because of SUBDIRS = lib
and once because of the recursive invocation) with some rare weird race

I have found that automake can include automakefiles in order to avoid
recursive make with %reldir% and %canon_reldir%.  Is it possible to
tell gnulib-tool to prepend %reldir%/ and %canon_reldir%_ at the right
places so that I could write:

    include lib/Makefile.am
    bin_PROGRAMS = test
    test_LDADD = lib/libgnu.la

Maybe this is an option of gnulib-tool but I could not find it.

So, is it possible to have %reldir%/ and %canon_reldir%_ in gnulib's
generated Makefile.am?  How should I proceed otherwise?

Best regards


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