On Sat, Jul 18, 2015 at 01:09:26AM +0200, Ulrich Weigand wrote:
> Dominik Vogt wrote:
> 
> > +      opt_esa_zarch = (has_highgprs) ? " -mzarch" : " -mesa";
> 
> This will force -mesa on old machines *even in -m64 mode*,
> which is wrong and will cause compilation to fail.
> 
> 
> > -/* Defaulting rules.  */
> >  #ifdef DEFAULT_TARGET_64BIT
> > -#define DRIVER_SELF_SPECS					\
> 
> This completely removes use of DRIVER_SELF_SPECS for defaulting,
> which I introduced back here:
> https://gcc.gnu.org/ml/gcc-patches/2003-06/msg03369.html
>...

New version of the patch and ChangeLog attached, as discussed
internally:

 * -march=native never setzt -mvx or -mhtm but disables these
   features if the cpu does not support them.  This always wins
   against any options set on the command line.

 * -march=native never sets -mesa, and appends -mzarch to the
   command line if the highgprs cpu flag is present and the command
   line does not specify -mesa (or -mzarch).

Ciao

Dominik ^_^  ^_^

-- 

Dominik Vogt
IBM Germany