From: Paul Eggert <eggert@cs.ucla.edu>
To: Andreas Schwab <schwab@suse.de>
Cc: libc-alpha@sourceware.org
Subject: Re: [RFC][PATCH v2] Add reallocarray function.
Date: Tue, 20 May 2014 15:45:00 -0000 [thread overview]
Message-ID: <537B7849.1010208@cs.ucla.edu> (raw)
In-Reply-To: <mvm61l0rhj3.fsf@hawking.suse.de>
Andreas Schwab wrote:
> Please report that as a gcc bug (it doesn't mark it either).
As far as I can tell this is a bug in GCC's documentation, not in its
implementation. As I mentioned cryptically in my previous message, if
FOO has the malloc attribute and you execute 'int **p = foo (...);', the
malloc attribute means that *P cannot point to previously-existing
storage (because *P is uninitialized junk). That is why the attribute
applies to calloc (because *P must be null, which also cannot point to
previously-existing storage) but not to realloc (because *P might be
initialized and might point to previously-existing storage).
For more about this confusing topic, please see:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56955
next prev parent reply other threads:[~2014-05-20 15:44 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-18 21:05 [RFC][PATCH] " Rüdiger Sonderfeld
2014-05-18 21:43 ` Paul Eggert
2014-05-18 21:50 ` [RFC][PATCH v2] " Rüdiger Sonderfeld
2014-05-19 4:27 ` Rüdiger Sonderfeld
2014-05-19 15:30 ` Joseph S. Myers
2014-05-20 4:35 ` Rich Felker
2014-05-20 8:17 ` Paul Eggert
2014-05-20 8:19 ` Andreas Schwab
2014-05-20 15:45 ` Paul Eggert [this message]
2014-05-20 20:47 ` Rich Felker
2014-05-20 20:56 ` Paul Eggert
2014-05-20 12:50 ` Rüdiger Sonderfeld
2014-05-20 14:18 ` Paul Eggert
2014-05-21 12:39 ` Rüdiger Sonderfeld
2014-05-22 5:45 ` Paul Eggert
2014-09-01 15:48 ` [RFC][PATCH] " Florian Weimer
2014-09-01 17:24 ` Rich Felker
2014-09-02 9:29 ` Florian Weimer
2014-09-02 13:03 ` Rich Felker
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