http://bugzilla.gdcproject.org/show_bug.cgi?id=206

            Bug ID: 206
           Summary: Wrong gcc5 __builtin_OPNAME_overflow signatures.
           Product: GDC
           Version: development
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gdc
          Assignee: ibuclaw@gdcproject.org
          Reporter: art.08.09@gmail.com

For example:

> import gcc.builtins;
> pragma(msg, typeof(__builtin_add_overflow));

->

  pure nothrow @nogc @safe extern (C) bool()

Which makes them unusable from D.


---------------------------------------------
void bug() {
   int r;
   __builtin_add_overflow(1, 2, &r);
}
---------------------------------------------

->

  error: function gcc.builtins.__builtin_add_overflow () is not callable using
argument types (int, int, int*)


They do work if the type is overridden; ie this hack works:

   @trusted bool overflow(string OP, A, B, R)(A a, B b, R* r) {
      import gcc.builtins;

      auto baofp = cast(typeof(&overflow))&mixin("__builtin_"~OP~"_overflow");

      return (*baofp)(a, b, r);
   }

   if (overflow!"add"(a, b, &r))
      error();

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