C++ PATCH for c++/41127

[Jason Merrill <jason at redhat dot com>]

We were committing too soon to parsing "enum name :" as a C++0x enum 
with explicit underlying type, when it can still be a type-specifier in 
a bit-field declaration.  Straightforward fix.

Tested x86_64-pc-linux-gnu, applied to trunk.

2009-08-31  Jason Merrill  <jason@redhat.com>

	PR c++/41127
	* parser.c (cp_parser_enum_specifier): Make sure the : is followed by a
	type-specifier-seq before we commit.

diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index a3e9f0e..64869cd 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -11967,11 +11967,19 @@ cp_parser_enum_specifier (cp_parser* parser)
   else
     identifier = make_anon_name ();
 
-  /* Check for the `:' that denotes a specified underlying type in C++0x.  */
+  /* Check for the `:' that denotes a specified underlying type in C++0x.
+     Note that a ':' could also indicate a bitfield width, however.  */
   if (cp_lexer_next_token_is (parser->lexer, CPP_COLON))
     {
       cp_decl_specifier_seq type_specifiers;
 
+      /* Consume the `:'.  */
+      cp_lexer_consume_token (parser->lexer);
+
+      /* Parse the type-specifier-seq.  */
+      cp_parser_type_specifier_seq (parser, /*is_condition=*/false,
+                                    &type_specifiers);
+
       /* At this point this is surely not elaborated type specifier.  */
       if (!cp_parser_parse_definitely (parser))
 	return NULL_TREE;
@@ -11979,15 +11987,8 @@ cp_parser_enum_specifier (cp_parser* parser)
       if (cxx_dialect == cxx98)
         maybe_warn_cpp0x ("scoped enums");
 
-      /* Consume the `:'.  */
-      cp_lexer_consume_token (parser->lexer);
-
       has_underlying_type = true;
 
-      /* Parse the type-specifier-seq.  */
-      cp_parser_type_specifier_seq (parser, /*is_condition=*/false,
-                                    &type_specifiers);
-
       /* If that didn't work, stop.  */
       if (type_specifiers.type != error_mark_node)
         {
diff --git a/gcc/testsuite/g++.dg/parse/enum5.C b/gcc/testsuite/g++.dg/parse/enum5.C
new file mode 100644
index 0000000..3ebb02f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/parse/enum5.C
@@ -0,0 +1,17 @@
+// PR c++/41127
+
+#define CHAR_BIT 8
+enum EE {ee};
+typedef unsigned int T;
+
+struct D {
+        T : sizeof(unsigned int) * CHAR_BIT; // OK
+        EE : sizeof(EE) * CHAR_BIT; // OK
+        enum EE : sizeof(EE) * CHAR_BIT; // not OK
+        enum EE xxxx : sizeof(EE) * CHAR_BIT; // OK
+        T x : sizeof(unsigned int) * CHAR_BIT; // OK
+        enum FF {ff} : sizeof(int) * CHAR_BIT; // OK
+} element;
+
+enum EE xx;
+EE yy;
diff --git a/gcc/testsuite/g++.dg/cpp0x/enum1.C b/gcc/testsuite/g++.dg/cpp0x/enum1.C
index af691f0..fb03692 100644
--- a/gcc/testsuite/g++.dg/cpp0x/enum1.C
+++ b/gcc/testsuite/g++.dg/cpp0x/enum1.C
@@ -2,5 +2,5 @@
 // { dg-do compile }
 // { dg-options "-std=gnu++0x" }
 
-enum : { };	// { dg-error "expected type-specifier" }
+enum : { };	// { dg-error "expected" }
 enum : 3 { };	// { dg-error "expected" }