On 2017-08-24 19:02, Kip Warner wrote: > Hey list, > > I'd like to transform the following variable in my Makefile.am from... > > files_only = a.foo b.foo c.foo d.foo ... > > Into... > > files_with_path = dir/a.foo dir/b.foo dir/c.foo dir/d.foo ... > > I'm aware of GNU Make's $addprefix magic. I'm also aware it's naughty > to use where portability is a concern and a different implementation of > make may be used behind Automake. I was wondering if anyone has come up > with a recipe for scenarios like this?
A portable way to do this is to do the work in configure.ac and transfer
it to the Makefile with AC_SUBST. For example, with an empty Makefile.am
and the following configure.ac:
AC_INIT([Example], [1.0])
AM_INIT_AUTOMAKE([foreign])
m4_define([m_files_only], [a.foo b.foo c.foo])
files_only='m_files_only'
files_with_path='m4_map_args_w(m_files_only, [dir/], [], [ ])'
AC_SUBST([files_only])
AC_SUBST([files_with_path])
AC_CONFIG_FILES([Makefile])
AC_OUTPUT
The desired macros will appear in the resulting Makefile:
files_only = a.foo b.foo c.foo
files_with_path = dir/a.foo dir/b.foo dir/c.foo
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