CMakeLists: use -O2 as ASAN_FLAG only in GCC versions before 7.0
Since the bug affecting the performance only affects GCC versions
before 7.0, use -O2 flag instead of -O3 for them and keep the
better optimization for newer compilers.
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 561498c..b6fcd68 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -249,9 +249,15 @@
# test_suite_pkwrite taking >3h on the CI. Observed with GCC 5.4 on
# Ubuntu 16.04 x86_64 and GCC 6.5 on Ubuntu 18.04 x86_64.
# GCC 7.5 and above on Ubuntu 18.04 appear fine.
- # To avoid the performance problem, we use -O2 here. It doesn't slow
- # down much even with modern compiler versions.
- set(CMAKE_C_FLAGS_ASAN "-fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover=all -O2")
+ # To avoid the performance problem, we use -O2 when GCC version is lower than 7.0.
+ # It doesn't slow down much even with modern compiler versions.
+ if (GCC_VERSION VERSION_LESS 7.0)
+ message(STATUS "USING O2")
+ set(CMAKE_C_FLAGS_ASAN "-fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover=all -O2")
+ else()
+ message(STATUS "USING O3")
+ set(CMAKE_C_FLAGS_ASAN "-fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover=all -O3")
+ endif()
set(CMAKE_C_FLAGS_ASANDBG "-fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover=all -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls")
set(CMAKE_C_FLAGS_TSAN "-fsanitize=thread -O3")
set(CMAKE_C_FLAGS_TSANDBG "-fsanitize=thread -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls")