re PR middle-end/81812 (Empty virtual function fails to compile)

2018-03-02  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/81812
	* g++.dg/torture/pr81812.C: New.

From-SVN: r258150

gcc/testsuite/ChangeLog

+2018-03-02  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/81812
+	* g++.dg/torture/pr81812.C: New.
+
 2018-03-02  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/84171

gcc/testsuite/g++.dg/torture/pr81812.C

+struct Error {
+  virtual void error(... ) const;
+};
+
+struct ChildNode : virtual Error {
+  void error(... ) const;
+};
+
+void ext(const char*, ...);
+
+void ChildNode::error(...) const
+{
+#ifdef FIX
+  ext("");
+#endif
+}