# https://forums.gentoo.org/viewtopic-t-984804-start-0.html
diff -Nupr Python-2.7.12/configure.ac Python-2.7.12-patched/configure.ac
--- Python-2.7.12/configure.ac	2016-10-10 14:06:18.732629530 +0200
+++ Python-2.7.12-patched/configure.ac	2016-10-10 14:07:19.453631912 +0200
@@ -1307,6 +1307,12 @@ then
   ac_cv_opt_olimit_ok=no
 fi
 
+# idem for clang
+if test "$CC" = clang
+then
+  ac_cv_opt_olimit_ok=no
+fi
+
 AC_MSG_CHECKING(whether $CC accepts -OPT:Olimit=0)
 AC_CACHE_VAL(ac_cv_opt_olimit_ok,
 [ac_save_cc="$CC"