Re: [RFC/PATCH 1/2] sparse: Fix including glibc headers on x86-64

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On Sun, Oct 23, 2011 at 5:36 AM,  <penberg@xxxxxxxxxxxxxx> wrote:
> From: Pekka Enberg <penberg@xxxxxxxxxx>
> Sparse treats code as 32-bit which causes problems for userspace projects on
> x86-64 Fedora if you don't have the 32-bit glibc compat package installed
> ("glib-devel.i686"):

A blast from the past. Thanks Frederic for reminding me this one.

> +
> +#ifdef __x86_64
> +       add_pre_buffer("#weak_define x86_64 1\n");
> +       add_pre_buffer("#weak_define __x86_64 1\n");
> +       add_pre_buffer("#weak_define __x86_64__ 1\n");
> +#endif
>  }

I just realized that this patch has the unwanted side effect that,
even if you try to define 32 bit compile in 64 bit Linux, the __x86_64__ will
still be there. The weak define only avoid the conflict of defining
the __x86_64__
the second time. It does not solve the case where __x86_64__ shouldn't
be there.

The better way seems to be parsing -m32 and -m64 then set the
__x86_64__ accordingly.

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