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Re: rfc: __builtin_syntax_error
On Tue, Jan 15, 2002 at 10:11:40PM -0200, Alexandre Oliva wrote:
> > /* Dummy prototype. */
> > extern void __altivec_link_error_invalid_argument ();
>
> Are you sure that, if you compile without optimization, the call of
> this undefined function is still going to be optimized away?
:-)
this is for use in:
__builtin_choose_expr (condition, true_expr, false_expr)
if condition is true, the value of __builtin_choose_expr will be
"true_expr" and false_expr will be neither evaluated nor executed.
__builtin_choose_expr is not really a built in per se, it's a hack
to the front end (see c-parse.y). so yes, i'm sure it won't even
be generated. however, it needs to be syntatically correct because
without the new parser diagnostic infrastructure, we parse both
true_expr and false_expr for syntactic correctness.
neat, huh?
aldy