[patch,target] Fix ppc-darwin issue with long double intrinsics (PR25477)

[Joseph S. Myers]

On Sun, 24 Feb 2008, Uros Bizjak wrote:

> Hello!
> 
> > > > +      /*darwin_patch_builtin (BUILT_IN_NANL);*/ /* Broken for now since
> > it
> > > > +        is defined as DEF_GCC_BUILTIN when it is also a C99 function.
> > */
> > 
> > Note that this (builtin nan*) is bug 19984, which explains the history
> > behind the use of DEF_GCC_BUILTIN.
> >   
> 
> Will attached patch fix this problem?
> 
> 2008-02-24  Uros Bizjak  <ubizjak@gmail.com>
> 
>        PR middle-end/19984
>        * builtins.def (BUILT_IN_NAN): Define as c99 builtin
>        using DEF_C99_BUILTIN.
>        (BUILT_IN_NANF): Ditto.
>        (BUILT_IN_NANL): Ditto.
> 
> Bootstrapped on x86_64-linux-gnu, regression test is in progress.

Clearly testcases are needed (that the builtins operate as such in C99 
mode, but are not accepted as constant expressions).

-- 
Joseph S. Myers
joseph@codesourcery.com