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Message-ID: <b0943d9e0607120338r37886ebck56db5fbf29e8e350@mail.gmail.com>
Date: Wed, 12 Jul 2006 11:38:48 +0100
From: "Catalin Marinas" <catalin.marinas@gmail.com>
To: "Michal Piotrowski" <michal.k.k.piotrowski@gmail.com>,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH 00/10] Kernel memory leak detector 0.8
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On 12/07/06, Joseph Fannin <jfannin@gmail.com> wrote:
> On Tue, Jul 11, 2006 at 02:00:05PM +0100, Catalin Marinas wrote:
> > That's a bug in gcc-4. The __builtin_constant_p() function always
> > returns true even when the argument is not a constant. You could try a
> > gcc-3.4 or a patched gcc.
>
>     Which gcc versions are affected by this?

>>From gcc-4.0 I think but I don't know when/if it was fixed in the
latest. I use CodeSourcery's toolchain and they fixed in in gcc-4.1
but that's with their own patches. Try to compile the code below. It
should work if the toolchain is OK:

        #include <stdlib.h>

        #define EXPR    atoi(argv[1])

        int main(int argc, char *argv[])
        {
            static int a[] = {
                __builtin_constant_p(EXPR) ? EXPR : 0
            };

            return a[0];
        }

-- 
Catalin