CORRECTED: Is there a '__builtin_compiletime_error' function of some sort?

[Ziemowit Laski <zlaski at apple dot com>]

And if not, would there be objections if I were to add one in?

What I need is something like the following:

void __builtin_compiletime_error (const char *msg) {
  error (msg);  // <=== gcc's error routine
}

Of course, I don't want every single compile to fail :-); rather, I'd 
want to use __builtin_compiletime_error () in conjunction with 
__builtin_choose_expr () and
__builtin_types_compatible_p () to perform el cheapo function 
overloading in C, e.g.:

#define func(a) \
  __builtin_choose_expr (__builtin_types_compatible_p (typeof (a), 
int), \
       ((int) func_int (a)), \
  __builtin_choose_expr (__builtin_types_compatible_p (typeof (a), 
float), \
       ((float) func_float (a)), \
  __bultin_compiletime_error ("no version of function 'func' matches 
parameter list")))


Does this sound like a reasonable plan of attack?

Thanks in advance,

--Zem