[Patch Darwin/PPC] make sure rs6000_current_abi is defined early enough.

[Iain Sandoe]

in http://gcc.gnu.org/ml/gcc-patches/2011-12/msg00312.html
I wrote:
where is "_CALL_DARWIN" supposed to come from? (it is not defined by  
the preprocessor AFAICT).

===

it seems that we don't define rs6000_current_abi before cpp builtins  
are emitted and the function uses it to decide to emit _CALL_DARWIN.

fixed as below,
OK for trunk?
(what opinion of 4.6?)

Iain

gcc:

        * config/rs6000/rs6000.c (darwin_rs6000_override_options): Initialize
        rs6000_current_abi.


Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc/config/rs6000/rs6000.c  (revision 181991)
+++ gcc/config/rs6000/rs6000.c  (working copy)
@@ -2502,6 +2502,7 @@ darwin_rs6000_override_options (void)
      off.  */
   rs6000_altivec_abi = 1;
   TARGET_ALTIVEC_VRSAVE = 1;
+  rs6000_current_abi = ABI_DARWIN;

   if (DEFAULT_ABI == ABI_DARWIN
       && TARGET_64BIT)