2011-01-21  Alan Modra  <amodra@gmail.com>

	* config/rs6000/rs6000-c.c (rs6000_cpu_cpp_builtins): Add
	builtin_define __CMODEL_MEDIUM__ and __CMODEL_LARGE__.

Index: gcc/config/rs6000/rs6000-c.c
===================================================================
--- gcc/config/rs6000/rs6000-c.c	(revision 169076)
+++ gcc/config/rs6000/rs6000-c.c	(revision 169077)
@@ -385,6 +385,20 @@ rs6000_cpu_cpp_builtins (cpp_reader *pfi
       builtin_define ("__LONGDOUBLE128");
     }
 
+  switch (TARGET_CMODEL)
+    {
+      /* Deliberately omit __CMODEL_SMALL__ since that was the default
+	 before --mcmodel support was added.  */
+    case CMODEL_MEDIUM:
+      builtin_define ("__CMODEL_MEDIUM__");
+      break;
+    case CMODEL_LARGE:
+      builtin_define ("__CMODEL_LARGE__");
+      break;
+    default:
+      break;
+    }
+
   switch (rs6000_current_abi)
     {
     case ABI_V4: