Bug#754901: libapache2-mod-perl2: breaks with gcc-4.9

[Niko Tyni]

On Mon, Aug 04, 2014 at 11:36:12PM +0300, Niko Tyni wrote:
> On Mon, Aug 04, 2014 at 12:13:42PM +0300, Niko Tyni wrote:
> > On Tue, Jul 15, 2014 at 11:31:52PM +0200, Matthias Klose wrote:
> > > Am 15.07.2014 20:48, schrieb Niko Tyni:
> > > > Package: libapache2-mod-perl2
> > > > Version: 2.0.8+httpd24-r1449661-6
> > > > Severity: important
> > > > X-Debbugs-Cc: gcc-4.9 at packages.debian.org
> > > > Tags: help
> > > > 
> > > > As seen in #754308, the libapache2-mod-perl2 build segfaults in the
> > > > test suite when built with gcc 4.9. We have worked around that in
> > > > 2.0.8+httpd24-r1449661-7 by building with 4.8, but that's not a long
> > > > term solution.

> > It works at -O0, modulo #756989 (which happens with gcc-4.8 too
> > but confused me into thinking this was more than just an optimizer
> > regression.)

> It's src/modules/perl/modperl_env.c, and I've narrowed it down to
> modperl_env_table_populate().

> I'm now working on a standalone test case but it's not very easy.
> Any help is appreciated.

No progress with the test case, but another data point: the optimization
that triggers this is -ftree-dse.
-- 
Niko Tyni   ntyni at debian.org