PR 30457 Please warn about va_start(ap, invalid)

[Manuel López-Ibáñez]

I wasn't able to come up with testcases for array types and function
types: they always decay into pointers.

Bootstrapped and regression tested on x86_64-unknown-linux-gnu with
--enable-languages=all.

OK for trunk?

2008-08-08  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	PR 30457
	* builtins.c (fold_builtin_next_arg): Add warning about undefined
	behaviour.
testsuite/
	* gcc.dg/pr30457.c: New.
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