[backport from gcc-4.7/trunk, fixes regression from PR47917 patch <mikpe@it.uu.se>]

Date: Tue, 15 Mar 2011 12:31:53 +0100
From: Jakub Jelinek <jakub at redhat dot com>
Subject: [committed] Fix fallout from snprintf folding patch (PR tree-optimization/48129)
List-Archive: <http://gcc.gnu.org/ml/gcc-patches/>

Hi!

On some targets implicit_built_in_decls[BUILT_IN_SNPRINTF] is NULL,
but as we want only the return type of the snprintf function
and fold_builtin_snprintf in that case is only used when
__builtin_* variant is used explicitly, using built_in_decls
is better and avoids the ICE.

Bootstrapped/regtested on x86_64-linux and i686-linux, tested
on the testcase with cross to cris-elf, committed to trunk
as obvious.

gcc/

2011-03-15  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/48129
	* builtins.c (fold_builtin_snprintf): Convert to type of
	built_in_decls[BUILT_IN_SNPRINTF] retval instead of
	implicit_built_in_decls[BUILT_IN_SNPRINTF] retval.

--- gcc-4.6-20110312/gcc/builtins.c.~1~	2011-03-16 16:24:51.000000000 +0100
+++ gcc-4.6-20110312/gcc/builtins.c	2011-03-16 16:27:48.000000000 +0100
@@ -12038,9 +12038,8 @@ fold_builtin_snprintf (location_t loc, t
 
   if (call && retval)
     {
-      retval = fold_convert_loc
-	(loc, TREE_TYPE (TREE_TYPE (implicit_built_in_decls[BUILT_IN_SNPRINTF])),
-	 retval);
+      tree fn = built_in_decls[BUILT_IN_SNPRINTF];
+      retval = fold_convert_loc (loc, TREE_TYPE (TREE_TYPE (fn)), retval);
       return build2 (COMPOUND_EXPR, TREE_TYPE (retval), call, retval);
     }
   else