[PATCH] PR 18164, ICE with inline-asm and empty constraint

[Andrew Pinski]

The problem here is that we were trying to construct a string with a
length of -1 which is wrong.  The way I fixed this problem is by not
processing empty strings in gimplify_asm_expr at all.

The double error message about "output operand constraint lacks '='"
is also fixed.

OK? Bootstrapped and tested on powerpc-darwin.

Thanks,
Andrew Pinski

ChangeLog:

	* gimplify.c (gimplify_asm_expr): If the length of an output operand
	is zero, do not process it, just let it go through.

Testcase:
/* { dg-do compile } */
void
f (void)
{
   int x;
   asm ("" :  "" (x)); /* {dg-error "output operand constraint lacks" } 
*/
}

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