PR c++/80073 - C++17 ICE with virtual base.

	* decl.c (xref_basetypes): Also check for indirect vbases.

From-SVN: r246242

gcc/cp/ChangeLog

+2017-03-17  Jason Merrill  <jason@redhat.com>
+
+	PR c++/80073 - C++17 ICE with virtual base.
+	* decl.c (xref_basetypes): Also check for indirect vbases.
+
 2017-03-16  Jason Merrill  <jason@redhat.com>
 
 	* decl.c (start_enum): std::byte aliases anything.

gcc/cp/decl.c

@@ -13812,6 +13812,9 @@ xref_basetypes (tree ref, tree base_list)
 
   if (max_vbases)
     {
+      /* An aggregate can't have virtual base classes.  */
+      CLASSTYPE_NON_AGGREGATE (ref) = true;
+
       vec_alloc (CLASSTYPE_VBASECLASSES (ref), max_vbases);
 
       if (max_dvbases)

gcc/testsuite/g++.dg/init/vbase2.C

+// PR c++/80073
+// { dg-do compile { target c++11 } }
+
+struct A {};
+
+struct B : virtual A {};
+
+struct C : B {} c {};