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[Bug c/42907] -fstrict-aliasing breaks valid code
- From: "fejj at novell dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 30 Jan 2010 23:34:38 -0000
- Subject: [Bug c/42907] -fstrict-aliasing breaks valid code
- References: <bug-42907-18727@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #27 from fejj at novell dot com 2010-01-30 23:34 -------
Steven: okay, thanks for the explanation.
My concern is that if I hit a similar case down the road and someone builds
with different optimization flags than I do, that I'd never figure out the
problem.
It was pure luck that I tracked it down to strict aliasing in this case because
when I found that -O0 and -O2 produced different code, my first instinct was to
google "gcc 4.4 broken" (or some such) and it turned up pages and pages of
links to people with similar (although not exactly identical) problems on
various mailing-lists and decided to try -fno-strict-aliasing and it worked.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42907