[CMake] Add -O1 in debug builds with LLVM_USE_SANITIZER

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189747 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/cmake/modules/HandleLLVMOptions.cmake b/cmake/modules/HandleLLVMOptions.cmake
index b49d6496125030778e47712fc4075cbc0bfbdcbc..4d56438f18de9fb4e89662c64095a93d3beca64c 100644 (file)
--- a/cmake/modules/HandleLLVMOptions.cmake
+++ b/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.