Fix fsanitize=address and fsanitize=thread clash

Author: Martin Mory

unittests/PhasarLLVM/DataFlowSolver/IfdsIde/CMakeLists.txt

@@ -15,7 +15,7 @@ set(ThreadedIfdsIdeSources
 if(UNIX AND CMAKE_CXX_COMPILER_ID MATCHES "^(Apple)?Clang$")
   # Only add thread sanitizer for the test if asan is disabled because both
   # cannot be active at the same time.
-  if (NOT "${LLVM_USE_SANITIZER}" MATCHES ".*Address.*")
+  if (NOT "${LLVM_USE_SANITIZER}" MATCHES ".*Address.*" AND NOT "${CMAKE_CXX_FLAGS}" MATCHES ".*address.*")
     # Append -fno-omit-frame-pointer to get better stack traces.
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-omit-frame-pointer -fsanitize=thread")
   endif()