[C++] use better sloc for enum literals

Index: decl.c
===================================================================
--- decl.c	(revision 163920)
+++ decl.c	(working copy)
@@ -11627,10 +11627,11 @@  finish_enum (tree enumtype)
 
 /* Build and install a CONST_DECL for an enumeration constant of the
    enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
+   LOC is the location of NAME.
    Assignment of sequential values by default is handled here.  */
 
 void
-build_enumerator (tree name, tree value, tree enumtype)
+build_enumerator (tree name, tree value, tree enumtype, location_t loc)
 {
   tree decl;
   tree context;
@@ -11745,12 +11746,12 @@  build_enumerator (tree name, tree value,
   if (context && context == current_class_type)
     /* This enum declaration is local to the class.  We need the full
        lang_decl so that we can record DECL_CLASS_CONTEXT, for example.  */
-    decl = build_lang_decl (CONST_DECL, name, type);
+    decl = build_lang_decl_ex (loc, CONST_DECL, name, type);
   else
     /* It's a global enum, or it's local to a function.  (Note local to
-      a function could mean local to a class method.  */
-    decl = build_decl (input_location, CONST_DECL, name, type);
-
+       a function could mean local to a class method.  */
+    decl = build_decl (loc, CONST_DECL, name, type);
+  
   DECL_CONTEXT (decl) = FROB_CONTEXT (context);
   TREE_CONSTANT (decl) = 1;
   TREE_READONLY (decl) = 1;
Index: pt.c
===================================================================
--- pt.c	(revision 163920)
+++ pt.c	(working copy)
@@ -17294,7 +17294,8 @@  tsubst_enum (tree tag, tree newtag, tree
       set_current_access_from_decl (decl);
 
       /* Actually build the enumerator itself.  */
-      build_enumerator (DECL_NAME (decl), value, newtag);
+      build_enumerator
+	(DECL_NAME (decl), value, newtag, DECL_SOURCE_LOCATION (decl));
     }
 
   finish_enum (newtag);
Index: parser.c
===================================================================
--- parser.c	(revision 163920)
+++ parser.c	(working copy)
@@ -13135,6 +13135,11 @@  cp_parser_enumerator_definition (cp_pars
 {
   tree identifier;
   tree value;
+  location_t loc;
+
+  /* Save the input location because we are interested in the location
+     of the identifier and not the location of the explicit value.  */
+  loc = cp_lexer_peek_token (parser->lexer)->location;
 
   /* Look for the identifier.  */
   identifier = cp_parser_identifier (parser);
@@ -13160,7 +13165,7 @@  cp_parser_enumerator_definition (cp_pars
     value = error_mark_node;
 
   /* Create the enumerator.  */
-  build_enumerator (identifier, value, type);
+  build_enumerator (identifier, value, type, loc);
 }
 
 /* Parse a namespace-name.
Index: cp-tree.h
===================================================================
--- cp-tree.h	(revision 163920)
+++ cp-tree.h	(working copy)
@@ -4771,7 +4771,7 @@  extern tree xref_tag_from_type			(tree, 
 extern bool xref_basetypes			(tree, tree);
 extern tree start_enum				(tree, tree, bool);
 extern void finish_enum				(tree);
-extern void build_enumerator			(tree, tree, tree);
+extern void build_enumerator			(tree, tree, tree, location_t);
 extern tree lookup_enumerator			(tree, tree);
 extern void start_preparsed_function		(tree, tree, int);
 extern int start_function			(cp_decl_specifier_seq *, const cp_declarator *, tree);
@@ -4943,6 +4943,7 @@  extern void yyungetc				(int, int);
 extern tree unqualified_name_lookup_error	(tree);
 extern tree unqualified_fn_lookup_error		(tree);
 extern tree build_lang_decl			(enum tree_code, tree, tree);
+extern tree build_lang_decl_ex			(location_t, enum tree_code, tree, tree);
 extern void retrofit_lang_decl			(tree);
 extern tree copy_decl				(tree);
 extern tree copy_type				(tree);
Index: lex.c
===================================================================
--- lex.c	(revision 163920)
+++ lex.c	(working copy)
@@ -507,13 +507,24 @@  unqualified_fn_lookup_error (tree name)
   return unqualified_name_lookup_error (name);
 }
 
+/* Wrapper around build_lang_decl_ex. Should gradually move to
+   build_lang_decl_ex.  */
+
 tree
 build_lang_decl (enum tree_code code, tree name, tree type)
 {
+  build_lang_decl_ex (input_location, code, name, type);
+}
+
+/* Build a decl from CODE, NAME, TYPE declared at LOC, and then add
+   DECL_LANG_SPECIFIC info to the result.  */
+
+tree
+build_lang_decl_ex (location_t loc, enum tree_code code, tree name, tree type)
+{
   tree t;
 
-  t = build_decl (input_location,
-		  code, name, type);
+  t = build_decl (loc, code, name, type);
   retrofit_lang_decl (t);
 
   return t;