C++ PATCH for c++/61046 (ICE with invalid designated initializer)

[Jason Merrill]

The code in reshape_init_class shouldn't assume that anything not an 
INTEGER_CST or FIELD_DECL is an IDENTIFIER_NODE.

Tested x86_64-pc-linux-gnu, applying to trunk.
commit 6a71aad5b83d18f742ee208dd249c7759e5cccb3
Author: Jason Merrill <ja...@redhat.com>
Date:   Mon Jun 2 21:51:08 2014 -0400
    	PR c++/61046
    	* decl.c (reshape_init_class): Handle un-folded
    	constant-expressions.

diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index c61ad68..8dc5f1f 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -5294,19 +5294,18 @@ reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
 	  if (d->cur->index == error_mark_node)
 	    return error_mark_node;
 
-	  if (TREE_CODE (d->cur->index) == INTEGER_CST)
-	    {
-	      if (complain & tf_error)
-		error ("%<[%E] =%> used in a GNU-style designated initializer"
-		       " for class %qT", d->cur->index, type);
-	      return error_mark_node;
-	    }
-
 	  if (TREE_CODE (d->cur->index) == FIELD_DECL)
 	    /* We already reshaped this.  */
 	    gcc_assert (d->cur->index == field);
-	  else
+	  else if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
 	    field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
+	  else
+	    {
+	      if (complain & tf_error)
+		error ("%<[%E] =%> used in a GNU-style designated initializer"
+		       " for class %qT", d->cur->index, type);
+	      return error_mark_node;
+	    }
 
 	  if (!field || TREE_CODE (field) != FIELD_DECL)
 	    {
diff --git a/gcc/testsuite/g++.dg/ext/desig7.C b/gcc/testsuite/g++.dg/ext/desig7.C
new file mode 100644
index 0000000..44358ec
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/desig7.C
@@ -0,0 +1,8 @@
+// PR c++/61046
+
+struct A
+{
+  int ary[4];
+};
+const int i = 0;
+A bar = { [i] = 0 }; // { dg-error "designated" }