From f9ab351b8a9f80a8d9e7001bdde39507f5b1ba04 Mon Sep 17 00:00:00 2001
From: Alexey Samsonov <samsonov@google.com>
Date: Mon, 2 Sep 2013 09:15:01 +0000
Subject: [PATCH] [CMake] Add -O1 in debug builds with LLVM_USE_SANITIZER

llvm-svn: 189747
---
 llvm/cmake/modules/HandleLLVMOptions.cmake | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index b49d64961250..4d56438f18de 100644
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -240,6 +240,10 @@ macro(append_common_sanitizer_flags)
       NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
     add_flag_if_supported("-gline-tables-only")
   endif()
+  # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large.
+  if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
+    add_flag_if_supported("-O1")
+  endif()
 endmacro()
 
 # Turn on sanitizers if necessary.