Re: [Xen-devel] [PATCH 11/34] xen/arm: Introduce __builtin_stack_pointer

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2014-03-26 at 10:38 +0000, Julien Grall wrote:
> 
> On 26/03/14 10:31, Ian Campbell wrote:
> > On Tue, 2014-03-25 at 18:01 +0000, Julien Grall wrote:
> >> Hi Ian,
> >>
> >> On 03/25/2014 05:18 PM, Ian Campbell wrote:
> >>> On Tue, 2014-03-25 at 16:55 +0000, Julien Grall wrote:
> >>>> Clang doesn't support named register. Introduce __builtin_stack_pointer
> >>>> to be able to use named register with gcc.
> >>>
> >>> I think gcc considers the __builtin namespace to be its own, not sure
> >>> about clang.
> >>
> >> I'm able to compile on GCC without any issue.
> >
> > That's not the point. The point of a namespacing rule is that gcc can
> > add such a function at any time it likes, and if that breaks your
> > application then that is tough luck.
> 
> Thanks, I didn't find anything useful on internet about namespace. It 
> seems the common rule is __foo is reserved by the compiler.

Yes, I think that comes from the C standard. odd numbers of  _ are for
the libc (by POSIX I think) and even numbers for the compiler (by the C
std).



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