Re: [PATCH 00/10] Kernel memory leak detector 0.8

[Horst von Brand <vonbrand@inf.utfsm.cl>]

Catalin Marinas <catalin.marinas@gmail.com> wrote:
> 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];
>        }

Fails with gcc-4.1.1-7 from Fedora Core development.
-- 
Dr. Horst H. von Brand                   User #22616 counter.li.org
Departamento de Informatica                     Fono: +56 32 654431
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