re PR c++/63693 (ICE in resolve_typename_type)

/cp
2015-08-22  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/63693
	* pt.c (resolve_typename_type): Use CLASSTYPE_PRIMARY_TEMPLATE_TYPE
	only on class types.

/testsuite
2015-08-22  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/63693
	* g++.dg/cpp0x/decltype63.C: New.

From-SVN: r227098

gcc/cp/ChangeLog

+2015-08-22  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/63693
+	* pt.c (resolve_typename_type): Use CLASSTYPE_PRIMARY_TEMPLATE_TYPE
+	only on class types.
+
 2015-08-21  Jason Merrill  <jason@redhat.com>
 
 	PR c++/67240

gcc/cp/pt.c

@@ -22673,7 +22673,8 @@ resolve_typename_type (tree type, bool only_current_p)
     return type;
   /* If SCOPE isn't the template itself, it will not have a valid
      TYPE_FIELDS list.  */
-  if (same_type_p (scope, CLASSTYPE_PRIMARY_TEMPLATE_TYPE (scope)))
+  if (CLASS_TYPE_P (scope)
+      && same_type_p (scope, CLASSTYPE_PRIMARY_TEMPLATE_TYPE (scope)))
     /* scope is either the template itself or a compatible instantiation
        like X<T>, so look up the name in the original template.  */
     scope = CLASSTYPE_PRIMARY_TEMPLATE_TYPE (scope);

gcc/testsuite/ChangeLog

+2015-08-22  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/63693
+	* g++.dg/cpp0x/decltype63.C: New.
+
 2015-08-22  Nathan Sidwell  <nathan@acm.org>
 
 	* c-c++-common/Wsizeof-pointer-memaccess1.c: Require alloca.

gcc/testsuite/g++.dg/cpp0x/decltype63.C

+// PR c++/63693
+// { dg-do compile { target c++11 } }
+
+template<typename T>
+class C{
+ T t;
+ decltype(t)::a::  // { dg-error "expected" }