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Message-ID: <SNT146-W35B4FA47FF58B1C0AE4071A8350@phx.gbl>
Date: Mon, 12 May 2014 02:23:19 +0100
From: Stephen Thomas <scjthm@...e.com>
To: "musl@...ts.openwall.com" <musl@...ts.openwall.com>, James Cloos
<cloos@...loos.com>
CC: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: RE: Broken GCC versions: 4.8.2 and 4.9.0
> On Sun, May 11, 2014 at 04:08:37PM -0400, James Cloos wrote:
> > >>>>> "RF" == Rich Felker <dalias@...c.org> writes:
> >
> > RF> I've tested it on gcc.godbolt.org and others have tested with local
> > RF> gcc 4.8.2 and 4.9.0, probably distro-provided (I didn't ask).
> >
> > I just tried debian-sid's 4.9. That does show the bug. As does their
> > gcc-snapshot version (a 4.10 pre).
> >
> > Perhaps the distro(s) which have the bug with 4.8.2 backported the commit
> > where the bug first occurs?
>
> Sounds plausible. Maybe that will help find the offending commit.
>
> > RF> I wonder if the broken GCC is using isl/cloog
> >
> > I use the graphite optimizer on my Gentoo box (which generated the
> > assembly I quoted). The graphite code is only used when one or more
> > of -floop-interchange -floop-strip-mine -floop-block are specified.
> >
> > Testing with those options doesn't change the results.
>
> OK, ruled that out then.
FWIW, I *think* noticed that this problem only appeared in buildroot, without enabling c++ in the languages. Actually, when I decided to evaluate the C++ changes and therefore enabled C++ in buildroot (I am not sure what it does in addition to --enable-languages=c,c++). I cannot be certain and I have not had the time to retest this.
Cheers
Thomo
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