Update clang to pretend to be gcc-4.2.
 - This really needs to be automated and configurable.

llvm-svn: 56635
diff --git a/clang/lib/Lex/Preprocessor.cpp b/clang/lib/Lex/Preprocessor.cpp
index 81a09f5..36e80c9 100644
--- a/clang/lib/Lex/Preprocessor.cpp
+++ b/clang/lib/Lex/Preprocessor.cpp
@@ -439,14 +439,14 @@
   DefineBuiltinMacro(Buf, "__clang__=1");  // Clang Frontend
   
   // Compiler set macros.
-  DefineBuiltinMacro(Buf, "__APPLE_CC__=5250");
+  DefineBuiltinMacro(Buf, "__APPLE_CC__=5621");
   DefineBuiltinMacro(Buf, "__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__=1050");
-  DefineBuiltinMacro(Buf, "__GNUC_MINOR__=0");
+  DefineBuiltinMacro(Buf, "__GNUC_MINOR__=2");
   DefineBuiltinMacro(Buf, "__GNUC_PATCHLEVEL__=1");
   DefineBuiltinMacro(Buf, "__GNUC__=4");
   DefineBuiltinMacro(Buf, "__GXX_ABI_VERSION=1002");
-  DefineBuiltinMacro(Buf, "__VERSION__=\"4.0.1 (Apple Computer, Inc. "
-                     "build 5250)\"");
+  DefineBuiltinMacro(Buf, "__VERSION__=\"4.2.1 (Apple Computer, Inc. "
+                     "build 5621) (dot 3)\"");
   
   // Build configuration options.
   DefineBuiltinMacro(Buf, "__DYNAMIC__=1");