message: Fix issue "CV_XADD compile errors with Embarcadero C++ Builder 10.1"
diff: @@ -438,7 +438,7 @@ Cv64suf;
  #ifdef CV_XADD
  // allow to use user-defined macro
  -#elif defined __GNUC__
  +#elif defined __GNUC__ || defined __clang__
  # if defined __clang__ && __clang_major__ >= 3 && !defined __ANDROID__ && !defined __EMSCRIPTEN__ && !defined(__CUDACC__)
  # ifdef __ATOMIC_ACQ_REL
  # define CV_XADD(addr, delta) __c11_atomic_fetch_add((_Atomic(int)*)(addr), delta, __ATOMIC_ACQ_REL)
  