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Re: core dumps in optimized case with gcc 3.0 and 3.0.1 (regressiona gainst 2.95)
- To: "Nuesser, Wilhelm" <wilhelm dot nuesser at sap dot com>
- Subject: Re: core dumps in optimized case with gcc 3.0 and 3.0.1 (regressiona gainst 2.95)
- From: Andreas Jaeger <aj at suse dot de>
- Date: Fri, 24 Aug 2001 18:41:20 +0200
- Cc: "'gcc at gcc dot gnu dot org'" <gcc at gcc dot gnu dot org>, "Hiller, Thomas" <thomas dot hiller at sap dot com>
- References: <816D93CCC927D31188570008C75D1DE106DEA592@dbwdfx1a.wdf.sap-ag.de>
"Nuesser, Wilhelm" <firstname.lastname@example.org> writes:
> when compiling our software ( binary size approx. 40 MB) with gcc 3.0 and
> 3.0.1 with -O2 on
> Linux ia32,
> RedHat 6.2 and SuSE 7.0 (i.e. glibc 2.1.3),
> kernel 2.2.19 and 2.4.4
> we find core dumps which do not appear when compiling with 2.95.[2,3]
> (with or without optimization) or with gcc 3* without optimizations.
> We suspect gcc bugs, since our software run on many 32 and 64 bit platforms,
> but - of course -
> we are not sure. We have no idea what is actually going on so we can not
> produce any testcase
> at the moment.
I would play around with the various compiler flags and check whether
one of the new optimizations causes the problem.
A usual suspect is that your program breaks the strict aliasing rules,
I would try -fno-strict-aliasing first.
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