re PR c++/39950 (__unix__ macro is not predefined on AIX platform (C and C++))

        PR target/39950
        * config/rs6000/aix.h (TARGET_OS_AIX_CPP_BUILTINS): Define
        __powerpc__, __PPC__, __unix__.

From-SVN: r179612

gcc/ChangeLog

+2011-10-06  David Edelsohn  <dje.gcc@gmail.com>
+
+	PR target/39950
+	* config/rs6000/aix.h (TARGET_OS_AIX_CPP_BUILTINS): Define
+	__powerpc__, __PPC__, __unix__.
+
 2011-10-06  Michael Matz  <matz@suse.de>
 
 	* i386/i386.opt (recip_mask, recip_mask_explicit,

gcc/config/rs6000/aix.h

@@ -97,6 +97,9 @@
     {						\
       builtin_define ("_IBMR2");		\
       builtin_define ("_POWER");		\
+      builtin_define ("__powerpc__");           \
+      builtin_define ("__PPC__");               \
+      builtin_define ("__unix__");              \
       builtin_define ("_AIX");			\
       builtin_define ("_AIX32");		\
       builtin_define ("_AIX41");		\