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Re: [patch] fix warnings with -D_FORTIFY_SOURCE and -Wformat-security

From: "Joseph S. Myers" <joseph at codesourcery dot com>
To: Gerald Pfeifer <gerald at pfeifer dot com>
Cc: Matthias Klose <doko at ubuntu dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>, fortran at gcc dot gnu dot org
Date: Mon, 16 Mar 2009 00:05:54 +0000 (UTC)
Subject: Re: [patch] fix warnings with -D_FORTIFY_SOURCE and -Wformat-security
References: <49BD8445.6070705@ubuntu.com> <alpine.LSU.1.99.0903152345450.20299@acrux.dbai.tuwien.ac.at> <49BD8604.5040405@ubuntu.com> <alpine.LSU.1.99.0903160057350.20299@acrux.dbai.tuwien.ac.at>

On Mon, 16 Mar 2009, Gerald Pfeifer wrote:

> On Sun, 15 Mar 2009, Matthias Klose wrote:
> > No, unfortunately this warning cannot be avoid by the (void) cast.
> 
> I wonder, is this something we should change or am I missing some
> subtle language standard issue?

It's the design of warn_unused_result that you're not meant to be able to 
cast away the return value.  The bug is that it's being applied to 
inappropriate functions, such as fwrite.  See bug 25509.

-- 
Joseph S. Myers
joseph@codesourcery.com

References:
- [patch] fix warnings with -D_FORTIFY_SOURCE and -Wformat-security
  - From: Matthias Klose
- Re: [patch] fix warnings with -D_FORTIFY_SOURCE and -Wformat-security
  - From: Gerald Pfeifer
- Re: [patch] fix warnings with -D_FORTIFY_SOURCE and -Wformat-security
  - From: Matthias Klose
- Re: [patch] fix warnings with -D_FORTIFY_SOURCE and -Wformat-security
  - From: Gerald Pfeifer

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