[Bug c/65244] Bogus -Wmaybe-uninitialized warning with posix_memalign() and -Og

["manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65244

--- Comment #5 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Ulf Magnusson from comment #4)
> Created attachment 34894 [details]
> -Wmaybe-uninitialized-warning with -Og with GCC 4.9.1
> 
> The testcase was in the comment. I'm attaching it.

Please read the link that I posted. We need "preprocessed" code because the
stdlib.h of Apple may be doing something weird which is confusing GCC.
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From: "ulfalizer at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65244] Bogus -Wmaybe-uninitialized warning with posix_memalign() and -Og
Date: Fri, 27 Feb 2015 21:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide244

--- Comment #6 from Ulf Magnusson <ulfalizer at gmail dot com> ---
Comment on attachment 34894
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id4894
-Wmaybe-uninitialized-warning with -Og with GCC 4.9.1

void exit(int __status) __attribute__ ((__noreturn__));
int posix_memalign(void **__memptr, __SIZE_TYPE__ __alignment, __SIZE_TYPE__
__size);

void *f(void) {
    void *ptr;

    if (posix_memalign(&ptr, 16, 256) != 0)
        exit(1);

    return ptr;
}