Removed the O2 flag since cmake still defines the O3 flag in CMAKE_CXX_FLAGS_RELEASE and it's confusing which one gcc chooses if both O3 and O2 are passed during compilation. If the issue was the march=native flag then this should also work on Tiara

src/standalone/CMakeLists.txt

@@ -21,7 +21,7 @@ if (BUILD_RT_VISUALIZATION)
 endif ()
 
 ## Compilation flags
-add_compile_options(-O2 -pipe ${OpenMP_CXX_FLAGS})
+add_compile_options(-pipe ${OpenMP_CXX_FLAGS})
 add_compile_options(-Wall -Wextra -Werror -Wdouble-promotion -Wfloat-conversion)# -Wshadow)
 
 ## Compile and link