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Re: [C/C++/IRA] PR 16302 gcc fails to warn about some common logic errors

From: Richard Guenther <richard dot guenther at gmail dot com>
To: "H.J. Lu" <hjl dot tools at gmail dot com>
Cc: Manuel López-Ibáñez <lopezibanez at gmail dot com>, Simon Martin <simartin at users dot sourceforge dot net>, Gcc Patch List <gcc-patches at gcc dot gnu dot org>, "Joseph S. Myers" <joseph at codesourcery dot com>, Mark Mitchell <mark at codesourcery dot com>, Jason Merrill <jason at redhat dot com>, Nathan Sidwell <nathan at codesourcery dot com>, Vladimir Makarov <vmakarov at redhat dot com>
Date: Sun, 17 May 2009 22:21:54 +0200
Subject: Re: [C/C++/IRA] PR 16302 gcc fails to warn about some common logic errors
References: <6c33472e0905142348y142c319br6d5ca874ec0456e7@mail.gmail.com> <4A0E7EC6.9020003@users.sourceforge.net> <6c33472e0905160244yce8c322mde6ecf5285b4c761@mail.gmail.com> <6dc9ffc80905160817k20bf638bof0cbe91ea4959c65@mail.gmail.com>

On Sat, May 16, 2009 at 5:17 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> 2009/5/16 Manuel López-Ibáñez <lopezibanez@gmail.com>:
>> That is strange, it should not warn for constants. Is it really 0 or
>> something else?
>
>
> I open a bug report with a testcase:
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40172

Given all this and that bootstrap is still not fixed for some targets
I seriously
doubt this warning is worth all this trouble.

Thus, I suggest to revert the patch or make the warning not part of -Wall.

Richard.

Follow-Ups:
- Re: [C/C++/IRA] PR 16302 gcc fails to warn about some common logic errors
  - From: Manuel López-Ibáñez
- Re: [C/C++/IRA] PR 16302 gcc fails to warn about some common logic errors
  - From: H.J. Lu

References:
- [C/C++/IRA] PR 16302 gcc fails to warn about some common logic errors
  - From: Manuel López-Ibáñez
- Re: [C/C++/IRA] PR 16302 gcc fails to warn about some common logic errors
  - From: Simon Martin
- Re: [C/C++/IRA] PR 16302 gcc fails to warn about some common logic errors
  - From: Manuel López-Ibáñez
- Re: [C/C++/IRA] PR 16302 gcc fails to warn about some common logic errors
  - From: H.J. Lu

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