Merge remote-tracking branch 'sebastian/clang-3.0-fixes_master'

changes/clang_30_options

@@ -0,0 +1,5 @@
+  o Code simplifications and refactoring:
+    - During configure, detect when we're building with clang version 3.0 or
+      lower and disable the -Wnormalized=id and -Woverride-init CFLAGS.
+      clang doesn't support them yet.
+

configure.in

@@ -1170,10 +1170,10 @@ if test x$enable_gcc_warnings = xyes || test x$enable_gcc_warnings_advisory = xy
 #error
 #endif])], have_gcc43=yes, have_gcc43=no)
 
-  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
-#if !defined(__clang__) || (__clang_major__ > 2) || (__clang_major__ == 2 && __clang_minor__ > 9)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
+#if !defined(__clang__)
 #error
-#endif])], have_clang29orlower=yes, have_clang29orlower=no)
+#endif])], have_clang=yes, have_clang=no)
 
   save_CFLAGS="$CFLAGS"
   CFLAGS="$CFLAGS -Wshorten-64-to-32"
@@ -1215,10 +1215,8 @@ if test x$enable_gcc_warnings = xyes || test x$enable_gcc_warnings_advisory = xy
     # We used to use -Wstrict-overflow=5, but that breaks us heavily under 4.3.
   fi
 
-  if test x$have_gcc42 = xyes && test x$have_clang29orlower = xno; then
+  if test x$have_gcc42 = xyes && test x$have_clang = xno; then
     # These warnings break gcc 4.0.2 and clang, but work on gcc 4.2
-    # We only disable these for clang 2.9 and lower, in case they are
-    # supported in later versions.
     CFLAGS="$CFLAGS -Wnormalized=id -Woverride-init"
   fi