[C PATCH] Fix ICE with invalid function call (PR c/64778)

[Jakub Jelinek]

Hi!

On the following testcase we ICE, because we end up with a CALL_EXPR
with error_mark_node argument and gimplification can't cope with that.

Normally, if one or more arguments are error_mark_node we return -1
and drop the whole call, but if we also report too many arguments,
we failed to do so.

Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux, ok for
trunk?

2015-01-26  Jakub Jelinek  <jakub@redhat.com>

	PR c/64778
	* c-typeck.c (convert_arguments): Return -1 if there are
	error_args, even if we've diagnosed too many arguments.

	* gcc.dg/pr64778.c: New test.

--- gcc/c/c-typeck.c.jj	2015-01-15 23:39:03.000000000 +0100
+++ gcc/c/c-typeck.c	2015-01-26 12:09:57.151820878 +0100
@@ -3143,7 +3143,7 @@ convert_arguments (location_t loc, vec<l
 	  else
 	    error_at (loc, "too many arguments to function %qE", function);
 	  inform_declaration (fundecl);
-	  return parmnum;
+	  return error_args ? -1 : (int) parmnum;
 	}
 
       if (selector && argnum > 2)
--- gcc/testsuite/gcc.dg/pr64778.c.jj	2015-01-26 12:18:12.216366230 +0100
+++ gcc/testsuite/gcc.dg/pr64778.c	2015-01-26 12:17:58.000000000 +0100
@@ -0,0 +1,10 @@
+/* PR c/64778 */
+/* { dg-do compile } */
+
+int
+foo (int p)
+{
+  int a;
+  a ^= foo (,);	/* { dg-error "expected expression before|too many arguments" } */
+  return a;
+}

	Jakub