Add thread-safety-beta for more coverage

Author: marta-lokhova

configure.ac

@@ -149,7 +149,7 @@ AC_ARG_ENABLE([threadsafety],
 AS_IF([test "x$enable_threadsafety" = "xyes"], [
   AC_MSG_NOTICE([enabling thread safety static analysis, see https://clang.llvm.org/docs/ThreadSafetyAnalysis.html])
   AS_CASE(["$CXX"],
-          [clang*], [CXXFLAGS="$CXXFLAGS -Wthread-safety -Werror=thread-safety -DTHREAD_SAFETY"],
+          [clang*], [CXXFLAGS="$CXXFLAGS -Wthread-safety -Werror=thread-safety -Wthread-safety-beta -Werror=thread-safety-beta -DTHREAD_SAFETY"],
           [AC_MSG_WARN([Thread safety analysis is only supported with Clang compiler, skipping])])
 ])