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Re: gcc 4.0.0 on amd64: problem with -O2?

From: Andrew Pinski <pinskia at physics dot uc dot edu>
To: Harald Dunkel <harald dot dunkel at t-online dot de>
Cc: gcc-bugs at gcc dot gnu dot org, aj at andaco dot de
Date: Sat, 7 May 2005 14:10:43 -0400
Subject: Re: gcc 4.0.0 on amd64: problem with -O2?
References: <427D0339.7030904@t-online.de>

On May 7, 2005, at 2:04 PM, Harald Dunkel wrote:

Hi folks,

The testcase has been created by grabbing some code
fragments from libX11, XFree86 4.3 on Debian, amd64.
-Wall complains about dereferencing type-punned pointer.


Stop right there, you said it warns, well this is a case where
you are violating C89/C99/C++ aliasing rules so it is a bug in your
code and not in GCC.

-- Pinski

Follow-Ups:
- Re: gcc 4.0.0 on amd64: problem with -O2?
  - From: Harald Dunkel

References:
- gcc 4.0.0 on amd64: problem with -O2?
  - From: Harald Dunkel

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