message: Fix Clang/C2 compatibility
  Clang/C2 does not implement __builtin_expect; additionally we need to
  work around deprecation warnings for fopen by disabling them.
diff: # pragma warning(disable: 4996) // this function or variable may be unsafe
  #endif
  +#if defined(_MSC_VER) && defined(__c2__)
  +# pragma clang diagnostic push
  +# pragma clang diagnostic ignored "-Wdeprecated" // this function or variable may be unsafe
  +#endif
  +
  #ifdef __INTEL_COMPILER
  # pragma warning(disable: 177) // function was declared but never referenced
  # pragma warning(disable: 279) // controlling expression is constant
  #endif
  // Branch weight controls
  -#if defined(__GNUC__)
  +#if defined(__GNUC__) && !defined(__c2__)
  # define PUGI__UNLIKELY(cond) __builtin_expect(cond, 0)
  #else
  # define PUGI__UNLIKELY(cond) (cond)
  @@ -12594,6 +12599,10 @@ namespace pugi
  # pragma warning(pop)
  #endif
  +#if defined(_MSC_VER) && defined(__c2__)
  +# pragma clang diagnostic pop
  +#endif
  +
  // Undefine all local macros (makes sure we're not leaking macros in header-only mode)
  #undef PUGI__NO_INLINE
  #undef PUGI__UNLIKELY
  