Use clang on mac if XCode >= 4.5

tools/gyp/find_mac_gcc_version.py

Index: tools/gyp/find_mac_gcc_version.py
diff --git a/tools/gyp/find_mac_gcc_version.py b/tools/gyp/find_mac_gcc_version.py
index 0af84120b6b22e9d1fa09b094252090c345124b9..573e27e526e59ae4b4efd54c9415a0b7958fc094 100755
--- a/tools/gyp/find_mac_gcc_version.py
+++ b/tools/gyp/find_mac_gcc_version.py
@@ -21,12 +21,14 @@ def main():
     major = int(matches[0][0])
     minor = int(matches[0][1])
 
-    if major >= 4:
-      return 'com.apple.compilers.llvmgcc42'
-    elif major == 3 and minor >= 1:
+    if major == 3 and minor >= 1:
       return '4.2'
+    elif major == 4 and minor < 5:
+      return 'com.apple.compilers.llvmgcc42'
     else:
-      raise Exception('Unknown XCode Version "%s"' % version_match)
+      # XCode seems to select the specific clang version automatically
+      return 'com.apple.compilers.llvm.clang.1_0'
+    raise Exception('Unknown XCode Version "%s"' % version_match)

[ricow1, 2013/04/24 13:48:09]

you can't hit this raise

[Ivan Posva, 2013/04/24 13:48:33]

Under what condition will you raise this exception here?

[kustermann, 2013/04/24 13:58:54]

True.

   else:
     raise Exception('Could not parse output of xcodebuild "%s"' % stdout)