You have to explicitly enable UBSan checks: -fsanitize=signed-integer-overflow See the UBSan docs: https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.

You have to explicitly enable UBSan checks: -fsanitize=signed-integer-overflow See the UBSan docs: https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html