From 2108b1d1953505854d1c6fbd8a5e282576ec154e Mon Sep 17 00:00:00 2001
From: Derek Dai <daiderek@gmail.com>
Date: Fri, 3 Mar 2017 08:52:40 +0800
Subject: [PATCH] add compiler flag to do sanity check of undefined behaviours.

---
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a9f81e6..690038f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,6 +27,10 @@ check_c_compiler_flag(-fstack-protector-strong HAS_STACK_PROTCTOR_STRONG)
 if(HAS_STACK_PROTCTOR_STRONG)
 	set(CMAKE_C_FLAGS "-fstack-protector-strong ${CMAKE_C_FLAGS}")
 endif()
+check_c_compiler_flag(-fsanitize=undefined HAS_SANITIZE_UNDEFINED)
+if(HAS_SANITIZE_UNDEFINED)
+	set(CMAKE_C_FLAGS "-fsanitize=undefined ${CMAKE_C_FLAGS}")
+endif()
 set(CMAKE_C_FLAGS "-std=gnu11 -Wall ${CMAKE_C_FLAGS}")
 add_definitions(-D_GNU_SOURCE)