diff -r d57c60db94e7 Misc/python-config.in
--- a/Misc/python-config.in	Mon Mar 04 20:35:55 2013 +0100
+++ b/Misc/python-config.in	Tue Mar 05 01:14:24 2013 +0100
@@ -9,6 +9,12 @@
 valid_opts = ['prefix', 'exec-prefix', 'includes', 'libs', 'cflags',
               'ldflags', 'extension-suffix', 'help', 'abiflags', 'configdir']
 
+filter_cflags = [ "-DNDEBUG", "-pipe", "-pg", "-g", "-dynamic", "-fno-common" ]
+def cflag_filter_function(flag):
+    return flag not in filter_cflags \
+        and not flag.startswith("-O") \
+        and (not flag.startswith("-W") or (len(flag) >= 4 and flag[3] == ','))
+
 def exit_with_usage(code=1):
     print("Usage: {0} [{1}]".format(
         sys.argv[0], '|'.join('--'+opt for opt in valid_opts)), file=sys.stderr)
@@ -42,6 +48,7 @@
                  '-I' + sysconfig.get_path('platinclude')]
         if opt == '--cflags':
             flags.extend(getvar('CFLAGS').split())
+            flags = filter(cflag_filter_function, flags)
         print(' '.join(flags))
 
     elif opt in ('--libs', '--ldflags'):