From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
"Jonathan Nieder" <jrnieder@gmail.com>,
"Johannes Schindelin" <Johannes.Schindelin@gmx.de>,
git@vger.kernel.org
Subject: Re: [PATCH 1/5] compat/obstack: fix -Wcast-function-type warnings
Date: Wed, 16 Jan 2019 00:55:46 +0100 [thread overview]
Message-ID: <20190115235546.GF840@szeder.dev> (raw)
In-Reply-To: <20190111185118.GD840@szeder.dev>
On Fri, Jan 11, 2019 at 07:51:18PM +0100, SZEDER Gábor wrote:
> On Fri, Jan 11, 2019 at 10:03:01AM -0800, Junio C Hamano wrote:
> > SZEDER Gábor <szeder.dev@gmail.com> writes:
> >
> > > On Thu, Jan 10, 2019 at 01:22:00PM -0800, Junio C Hamano wrote:
> > >> Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:
> > >> ...
> > >> > I.e. is this another case where we're blindly fixing bugs but should
> > >> > just re-import upstream's code instead?
> > >>
> > >> Good point. I am inclined to queue the remainder of the series
> > >> without this one for now.
> > >
> > > Note that without this first patch the linux-gcc build job will fail
> > > with the above compiler error, and that's the only build job that runs
> > > the test suite with all the misc test knobs (split-index,
> > > commit-graph, etc.) enabled.
> >
> > I know.
> >
> > The point is to give more incentive to try what was suggested
> > earlier by Ævar (in short, "try to do the right thing, before
> > hacking around locally in this project" ;-)
>
> Well, first I'm not sure what changes Ævar meant to be backported.
> Back then I briefly glanced at glibc's gitweb [1], but didn't see
> anything remotely relevant to these compiler errors.
So, I looked at the gnulib repository, where glibc got it's
obstack.{c,h} from, and it does have a fix for this issue in commit
127ed6a3e (obstack: avoid potentially-nonportable function casts,
2014-11-04):
http://git.savannah.gnu.org/cgit/gnulib.git/commit?id=127ed6a3ea9c46452f079dee50382dc1f70ea796
It chose basically the same approach as my fix, i.e. storing pointers
to functions with different signatures in an union. However,, the
differences between our and their obstack.{c,h} are way too big to
backport their patch.
> As to re-importing obstack.{c,h} from upstream, we've made some
> portability fixes to these files, and neither of the commit messages
> of those fixes mention that they are backports from upstream. OTOH,
> one of those commits mentions platforms like
> "i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1, SunOS 5.10", which makes
> me suspect that the re-import will be susceptible to those portability
> issues again. Therefore, I think re-importing these files from
> upstream is beyond the scope of this patch series (and might not be
> the right thing at all).
gnulib's obstack.{c,h} doesn't fix the issues that we've fixed in
3254310863 (obstack.c: Fix some sparse warnings, 2011-09-11) and
d190a0875f (obstack: Fix portability issues, 2011-08-28). So if we
were to re-import from gnulib, then these two patches would have to be
applied on top yet again.
> [1] https://sourceware.org/git/?p=glibc.git;a=history;f=malloc/obstack.c;h=1669641983512d64f66c1ad659562f77ef48adfd;hb=refs/heads/master
>
next prev parent reply other threads:[~2019-01-15 23:55 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-16 18:45 On overriding make variables from the environment SZEDER Gábor
2018-10-16 21:54 ` Jonathan Nieder
2018-10-16 22:33 ` SZEDER Gábor
2018-10-16 22:40 ` Jonathan Nieder
2018-10-17 14:29 ` SZEDER Gábor
2018-10-18 10:01 ` Johannes Schindelin
2018-10-18 12:49 ` Junio C Hamano
2018-12-20 16:24 ` [PATCH 0/5] travis-ci: build with the right compiler SZEDER Gábor
2018-12-20 16:24 ` [PATCH 1/5] compat/obstack: fix -Wcast-function-type warnings SZEDER Gábor
2018-12-20 23:12 ` Ævar Arnfjörð Bjarmason
2019-01-10 21:22 ` Junio C Hamano
2019-01-11 0:37 ` SZEDER Gábor
2019-01-11 18:03 ` Junio C Hamano
2019-01-11 18:51 ` SZEDER Gábor
2019-01-15 23:55 ` SZEDER Gábor [this message]
2019-01-16 1:13 ` Jonathan Nieder
2019-01-17 1:36 ` SZEDER Gábor
2019-01-16 4:16 ` Junio C Hamano
2018-12-20 16:24 ` [PATCH 2/5] .gitignore: ignore external debug symbols from GCC on macOS SZEDER Gábor
2018-12-20 16:24 ` [PATCH 3/5] travis-ci: don't be '--quiet' when running the tests SZEDER Gábor
2018-12-20 16:24 ` [PATCH 4/5] travis-ci: switch to Xcode 10.1 macOS image SZEDER Gábor
2018-12-20 16:24 ` [PATCH 5/5] travis-ci: build with the right compiler SZEDER Gábor
2019-01-03 16:01 ` Johannes Schindelin
2019-01-17 1:29 ` [PATCH v2 0/5] " SZEDER Gábor
2019-01-17 1:29 ` [PATCH v2 1/5] compat/obstack: fix -Wcast-function-type warnings SZEDER Gábor
2019-01-17 1:29 ` [PATCH v2 2/5] .gitignore: ignore external debug symbols from GCC on macOS SZEDER Gábor
2019-01-17 1:29 ` [PATCH v2 3/5] travis-ci: don't be '--quiet' when running the tests SZEDER Gábor
2019-01-17 13:28 ` Johannes Schindelin
2019-01-17 1:29 ` [PATCH v2 4/5] travis-ci: switch to Xcode 10.1 macOS image SZEDER Gábor
2019-01-17 1:29 ` [PATCH v2 5/5] travis-ci: build with the right compiler SZEDER Gábor
2019-01-17 13:44 ` Johannes Schindelin
2019-01-17 14:56 ` SZEDER Gábor
2019-01-18 8:40 ` Johannes Schindelin
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