PR c++/24511 - [DR 470] explicit instantiation/extern template unsats

PR c++/24511 - [DR 470] explicit instantiation/extern template unsats
// on symbols defined later

gcc/testsuite/ChangeLog:
	* g++.dg/template/explicit9.C: New test.

From-SVN: r244337

gcc/testsuite/ChangeLog

+2017-01-11  Martin Sebor  <msebor@redhat.com>
+
+	PR c++/24511
+	* g++.dg/template/explicit9.C: New test.
+
 2017-01-11  Nathan Sidwell  <nathan@acm.org>
 
 	PR c++/77812

gcc/testsuite/g++.dg/template/explicit9.C

+// PR c++/24511 - [DR 470] explicit instantiation/extern template unsats
+// on symbols defined later
+// { dg-do compile }
+
+template <class T> struct S { T foo (); T bar (); };
+template <class T> T S<T>::foo () { return T (); }
+
+#ifndef MAIN
+
+// This part is being tested by the dg-final directive.
+template struct S<int>;
+#else
+
+// This part is not being tested.
+extern template struct S<int>;
+int main ()
+{
+  return S<int>().foo () + S<int>().bar ();
+}
+#endif
+
+template <class T> T S<T>::bar () { return T (); }
+
+// { dg-final { scan-assembler-not "\\\*UND\\\*\[^\n]*_Z1fIiEvPT_" } }