[C++ PATCH] Fix error-recovery for scoped enum templates (PR c++/38637)

[Jakub Jelinek]

Hi!

Neither SET_SCOPED_ENUM_P, nor ENUM_UNDERLYING_TYPE etc. apply well to
error_mark_node, which can be returned e.g. from pushtag.  The following
patch fixes it by returning early if enumtype is error_mark_node.

Bootstrapped/regtested on x86_64-linux, ok for trunk?

2008-12-27  Jakub Jelinek  <jakub@redhat.com>

	PR c++/38637
	* decl.c (start_enum): If enumtype is error_mark_node, exit early.

	* g++.dg/cpp0x/enum2.C: New test.

--- gcc/cp/decl.c.jj	2008-12-19 10:19:10.000000000 +0100
+++ gcc/cp/decl.c	2008-12-27 10:19:00.000000000 +0100
@@ -10891,6 +10891,9 @@ start_enum (tree name, tree underlying_t
       enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
     }
 
+  if (enumtype == error_mark_node)
+    return enumtype;
+
   if (scoped_enum_p)
     {
       SET_SCOPED_ENUM_P (enumtype, 1);
--- gcc/testsuite/g++.dg/cpp0x/enum2.C.jj	2008-12-27 10:21:51.000000000 +0100
+++ gcc/testsuite/g++.dg/cpp0x/enum2.C	2008-12-27 10:21:11.000000000 +0100
@@ -0,0 +1,5 @@
+// PR c++/38637
+// { dg-do compile }
+// { dg-options "-std=c++0x" }
+
+template<int> enum E : int { e };	// { dg-error "template declaration of" }

	Jakub