--- llvm.orig/llvm-3.7.0_rc3.ebuild	2015-08-26 17:01:02.000000000 +1000
+++ llvm/llvm-3.7.0_rc3.ebuild	2015-08-30 16:38:21.003162498 +1000
@@ -194,6 +194,11 @@
 			-i tools/lldb/scripts/Python/modules/CMakeLists.txt || die
 	fi
 
+	# bug 421527
+	find "${S}"/projects/compiler-rt/lib/builtins -type f -name \*.S -exec sed \
+		 -e '$a\\n#if defined(__linux__) && defined(__ELF__)\n.section .note.GNU-stack,"",%progbits\n#endif' \
+		 -i {} \; || die
+
 	# User patches
 	epatch_user