From 4d25c2bc76f0a708c2ba470b6bfeb547efe37115 Mon Sep 17 00:00:00 2001
From: Katerina Barone-Adesi <katerinab@gmail.com>
Date: Fri, 16 May 2014 18:07:34 +0200
Subject: [PATCH] build: Support building using clang-usan and
 disable-optimization

Clang Undefined Behaviour Sanitizer seems to make non-constant constant
expressions, making the compilation fail when they are used within
inline assembly if no optimization is requested.

Add -O1 to the cflags to hide the misbehaviour.

Bug-Id: 683
---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index 6f84dfab0ff..74a4df12213 100755
--- a/configure
+++ b/configure
@@ -2443,7 +2443,7 @@ case "$toolchain" in
     ;;
     clang-usan)
         cc_default="clang"
-        add_cflags  -fsanitize=undefined
+        add_cflags  -fsanitize=undefined -O1
         add_ldflags -fsanitize=undefined
     ;;
     gcc-asan)
-- 
2.39.2