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Re: Update GCC to autoconf 2.69, automake 1.15.1
- From: Richard Biener <richard dot guenther at gmail dot com>
- To: Thomas Koenig <tkoenig at netcologne dot de>
- Cc: "Joseph S. Myers" <joseph at codesourcery dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>, "fortran at gcc dot gnu dot org" <fortran at gcc dot gnu dot org>, "libstdc++" <libstdc++ at gcc dot gnu dot org>, Bruce Korb <bkorb at gnu dot org>, ibuclaw at gdcproject dot org, Ian Lance Taylor <ian at airs dot com>, Jakub Jelinek <jakub at redhat dot com>, cmtice at google dot com, simon dot marchi at ericsson dot com
- Date: Wed, 31 Oct 2018 10:47:59 +0100
- Subject: Re: Update GCC to autoconf 2.69, automake 1.15.1
- References: <alpine.DEB.email@example.com> <firstname.lastname@example.org>
On Wed, Oct 31, 2018 at 8:12 AM Thomas Koenig <email@example.com> wrote:
> Am 31.10.18 um 04:26 schrieb Joseph Myers:
> > This patch (diffs to generated files omitted below) updates GCC to use
> > autoconf 2.69 and automake 1.15.1.
> I think this should fix PR 82856. Maybe you could confirm that this
> restores automake functionality with perl 5.6.26, and mention the PR
> in the ChangeLog.
> > Makefile.am:48: warning: source file 'caf/single.c' is in a subdirectory,
> > Makefile.am:48: but option 'subdir-objects' is disabled
> > automake: warning: possible forward-incompatibility.
> > automake: At least a source file is in a subdirectory, but the 'subdir-objects'
> > automake: automake option hasn't been enabled. For now, the corresponding output
> > automake: object file(s) will be placed in the top-level directory. However,
> > automake: this behaviour will change in future Automake versions: they
> > will
> > automake: unconditionally cause object files to be placed in the same subdirectory
> > automake: of the corresponding sources.
> > automake: You are advised to start using 'subdir-objects' option throughout your
> > automake: project, to avoid future incompatibilities.
> > I think it's best for the relevant maintainers to add subdir-objects
> > and do any other associated Makefile.am changes needed. In some cases
> > the paths in the warnings involved ../; I don't know if that adds any
> > extra complications to the use of subdir-objects.
> I'm not an automake expert, but I hope to be able to figure out
> what is needed. If not, I guess I'll just ask :-)
> What is the plan for the previous branches? Currently, it is necessary
> to keep around a special version of automake etc for
> --enable-maintainer-mode to work. Backporting a patch which
> involves regeneration of files in libgfortran/generated from
> the files in libgfortan/m4 would then require keeping two versions
> of the relevant tools around, and switching between them.
Does the regeneration really involve the automake/autoconf part
or would it be feasible to decouple it from --enable-maintainer-mode?
> Would it make sense to backport because of this?
I don't think so.
> Thanks for your efforts!