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 Content of type "text/html" skipped
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