<p dir="ltr"><br>
On Jan 26, 2016 2:59 PM, "Mathieu Desnoyers" <<a href="mailto:mathieu.desnoyers@efficios.com">mathieu.desnoyers@efficios.com</a>> wrote:<br>
><br>
> ----- On Jan 26, 2016, at 11:28 AM, Khem Raj <a href="mailto:raj.khem@gmail.com">raj.khem@gmail.com</a> wrote:<br>
><br>
> >> On Jan 25, 2016, at 8:02 PM, Mathieu Desnoyers <<a href="mailto:mathieu.desnoyers@efficios.com">mathieu.desnoyers@efficios.com</a>><br>
> >> wrote:<br>
> >><br>
> >> Hi,<br>
> >><br>
> >> We are noticing the presence of the following patch in various<br>
> >> openembedded gcc versions:<br>
> >><br>
> >> 0024-PR-target-32219.patch<br>
> >><br>
> >> "From e0d15f4f8bf28c351b9215ca37f1caa24df0e1fd Mon Sep 17 00:00:00 2001<br>
> >> From: Khem Raj <<a href="mailto:raj.khem@gmail.com">raj.khem@gmail.com</a>><br>
> >> Date: Fri, 29 Mar 2013 09:18:54 +0400<br>
> >> Subject: [PATCH 24/35] PR target/32219<br>
> >><br>
> >> * varasm.c (default_binds_local_p_1): Weak data is not local.<br>
> >><br>
> >> Signed-off-by: Bernhard Reutner-Fischer <<a href="mailto:rep.dot.nop@gmail.com">rep.dot.nop@gmail.com</a>><br>
> >> Signed-off-by: Khem Raj <<a href="mailto:raj.khem@gmail.com">raj.khem@gmail.com</a>><br>
> >><br>
> >> Upstream-Status: Backport"<br>
> >><br>
> >> However, contrarily to its "Backport" status, that patch is<br>
> >> not upstream in gcc, and we're starting to wonder if this<br>
> >> would be the patch that breaks handling of start/stop automatic<br>
> >> hidden symbols we use in lttng-ust.<br>
> >><br>
> >> We are only experiencing problems on the various openembedded<br>
> >> compilers, but on no other distro (with same compiler versions),<br>
> >> which leads us to suspect a buggy distro-specific gcc patch.<br>
> >><br>
> >> We've been testing with openembedded gcc-4.9.2-r0.<br>
> >><br>
> >> The original gold linker issue that this patch was trying to<br>
> >> address seems to have been fixed in the gold linke since<br>
> >> then.<br>
> >><br>
> >> Refs:<br>
> >> <a href="http://lists.lttng.org/pipermail/lttng-dev/2014-May/023112.html">http://lists.lttng.org/pipermail/lttng-dev/2014-May/023112.html</a><br>
> >> <a href="https://gcc.gnu.org/ml/gcc-help/2014-05/msg00042.html">https://gcc.gnu.org/ml/gcc-help/2014-05/msg00042.html</a><br>
> >> <a href="http://cgit.openembedded.org/openembedded-core/commit/?id=3cb2b003db7371b3a47d02c08352a262e1e419b4">http://cgit.openembedded.org/openembedded-core/commit/?id=3cb2b003db7371b3a47d02c08352a262e1e419b4</a><br>
> >> <a href="https://sourceware.org/bugzilla/show_bug.cgi?id=15435">https://sourceware.org/bugzilla/show_bug.cgi?id=15435</a><br>
> >><br>
> >> Thoughts ?<br>
> ><br>
> > OE has defaulted to gcc5 since last release, and gold issue is fixed in binutils<br>
> > 2.25<br>
> > which is what we use in 2.0 as well so it might be OK to unbolt this fix.<br>
> > Although I am not sure<br>
> > about the original problem reported in PR32219 is fixed for gcc 4.9 if we remove<br>
> > this fix.<br>
> > Have you narrowed down your issue to this patch ? if not, then it would be good<br>
> > to do so<br>
><br>
> Yes, we have narrowed down our problem to this specific patch by<br>
> removing the patch from the OE gcc patches, rebuilding gcc, and<br>
> then building our test program with that gcc. The problem goes<br>
> away when we do so, which points directly to that patch as a<br>
> culprit.<br>
><br>
> Test program is attached.</p>
<p dir="ltr">Ok I think we can remove this from master and jethro release<br>
><br>
> Faulty[gcc 4.9-r0 with patch 0024]:<br>
><br>
> main: myvar addr=0x600c90 __start___test=0x600c90<br>
> fct: myvar addr=0x7f8733d1eae8 __start___test=0x600c90<br>
> fct2: myvar addr=0x7f8733d1eaec __start___test=0x600c90<br>
> fct3: myvar addr=0x600c94 __start___test=0x600c90<br>
><br>
> Valid[gcc 4.9-r0 without patch 0024]:<br>
><br>
> main: myvar addr=0x600c60 __start___test=0x600c60<br>
> fct: myvar addr=0x7fb62c758a90 __start___test=0x7fb62c758a90<br>
> fct2: myvar addr=0x7fb62c758a94 __start___test=0x7fb62c758a90<br>
> fct3: myvar addr=0x600c64 __start___test=0x600c60<br>
><br>
> Thanks,<br>
><br>
> Mathieu<br>
><br>
> ><br>
> >><br>
> >> Thanks,<br>
> >><br>
> >> Mathieu<br>
> >><br>
> >> --<br>
> >> Mathieu Desnoyers<br>
> >> EfficiOS Inc.<br>
> > > <a href="http://www.efficios.com">http://www.efficios.com</a><br>
><br>
> --<br>
> Mathieu Desnoyers<br>
> EfficiOS Inc.<br>
> <a href="http://www.efficios.com">http://www.efficios.com</a><br>
</p>