Catalin Marinas <[email protected]> wrote:
> On 12/07/06, Joseph Fannin <[email protected]> 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.
--
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