parser.c (cp_lexer_next_token_is_decl_specifier_keyword): Note that auto is…

parser.c (cp_lexer_next_token_is_decl_specifier_keyword): Note that auto is either a storage class or a simple type specifier...

2008-03-01  Douglas Gregor  <doug.gregor@gmail.com>

	* parser.c (cp_lexer_next_token_is_decl_specifier_keyword): Note
	that auto is either a storage class or a simple type specifier,
	depending on the dialect.
	(cp_parser_decl_specifier_seq): Complain about `auto' as a storage
	specifier in C++98 mode, error in C++0x mode (since we don't
	support auto as a type specifier, yet).
	(cp_parser_storage_class_specifier_opt): Don't treat `auto' as a
	storage specifier in C++0x mode.
	(cp_parser_simple_type_specifier): Parse `auto' as a
	simple-type-specifier, but error because we don't support it yet.

2008-03-01  Douglas Gregor  <doug.gregor@gmail.com>

	* g++.dg/cpp0x/auto1.C: New.

From-SVN: r132806

gcc/cp/ChangeLog

+2008-03-01  Douglas Gregor  <doug.gregor@gmail.com>
+
+	* parser.c (cp_lexer_next_token_is_decl_specifier_keyword): Note
+	that auto is either a storage class or a simple type specifier,
+	depending on the dialect.
+	(cp_parser_decl_specifier_seq): Complain about `auto' as a storage
+	specifier in C++98 mode, error in C++0x mode (since we don't
+	support auto as a type specifier, yet).
+	(cp_parser_storage_class_specifier_opt): Don't treat `auto' as a
+	storage specifier in C++0x mode.
+	(cp_parser_simple_type_specifier): Parse `auto' as a
+	simple-type-specifier, but error because we don't support it yet.
+
 2008-02-29  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
 
 	* parser.c (cp_parser_nonclass_name): New.

gcc/cp/parser.c

@@ -539,8 +539,10 @@ cp_lexer_next_token_is_decl_specifier_keyword (cp_lexer *lexer)
   token = cp_lexer_peek_token (lexer);
   switch (token->keyword) 
     {
-      /* Storage classes.  */
+      /* auto specifier: storage-class-specifier in C++,
+         simple-type-specifier in C++0x.  */
     case RID_AUTO:
+      /* Storage classes.  */
     case RID_REGISTER:
     case RID_STATIC:
     case RID_EXTERN:
@@ -8134,6 +8136,26 @@ cp_parser_decl_specifier_seq (cp_parser* parser,
 	     GNU Extension:
 	       thread  */
 	case RID_AUTO:
+          /* Consume the token.  */
+          cp_lexer_consume_token (parser->lexer);
+
+          if (cxx_dialect == cxx98) 
+            {
+              /* Complain about `auto' as a storage specifier, if
+                 we're complaining about C++0x compatibility.  */
+              warning 
+                (OPT_Wc__0x_compat, 
+                 "%<auto%> will change meaning in C++0x; please remove it");
+
+              /* Set the storage class anyway.  */
+              cp_parser_set_storage_class (parser, decl_specs, RID_AUTO);
+            }
+          else 
+            /* We do not yet support the use of `auto' as a
+               type-specifier.  */
+            error ("C++0x %<auto%> specifier not supported");
+          break;
+
 	case RID_REGISTER:
 	case RID_STATIC:
 	case RID_EXTERN:
@@ -8266,6 +8288,10 @@ cp_parser_storage_class_specifier_opt (cp_parser* parser)
   switch (cp_lexer_peek_token (parser->lexer)->keyword)
     {
     case RID_AUTO:
+      if (cxx_dialect != cxx98)
+        return NULL_TREE;
+      /* Fall through for C++98.  */
+
     case RID_REGISTER:
     case RID_STATIC:
     case RID_EXTERN:
@@ -10705,6 +10731,7 @@ cp_parser_type_specifier (cp_parser* parser,
    C++0x Extension:
 
    simple-type-specifier:
+     auto
      decltype ( expression )   
 
    GNU Extension:
@@ -10776,6 +10803,17 @@ cp_parser_simple_type_specifier (cp_parser* parser,
       type = void_type_node;
       break;
       
+    case RID_AUTO:
+      if (cxx_dialect != cxx98)
+        {
+          /* Consume the token.  */
+          cp_lexer_consume_token (parser->lexer);
+          /* We do not yet support the use of `auto' as a
+             type-specifier.  */
+          error ("C++0x %<auto%> specifier not supported");
+        }
+      break;
+
     case RID_DECLTYPE:
       /* Parse the `decltype' type.  */
       type = cp_parser_decltype (parser);

gcc/testsuite/ChangeLog

+2008-03-01  Douglas Gregor  <doug.gregor@gmail.com>
+
+	* g++.dg/cpp0x/auto1.C: New.
+
 2008-03-01  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
 
 	PR fortran/34770

gcc/testsuite/g++.dg/cpp0x/auto1.C

+// { dg-options "-std=c++98 -Wc++0x-compat" }
+
+// Test warning for use of auto in C++98 mode with C++0x
+// compatibility warnings
+void f()
+{
+  auto int x = 5; // { dg-warning "will change meaning" }
+}