PR c++/58281 - Problem with explicitly instantiated constexpr template

PR c++/58281 - Problem with explicitly instantiated constexpr template
	functions

gcc/testsuite/ChangeLog:
2016-03-15  Martin Sebor  <msebor@redhat.com>

	PR c++/58281
	* g++.dg/cpp1y/constexpr-instantiate.C: Add new test.

From-SVN: r234246

gcc/testsuite/ChangeLog

+2016-03-15  Martin Sebor  <msebor@redhat.com>
+
+	PR c++/58281
+	* g++.dg/cpp1y/constexpr-instantiate.C: Add new test.
+
 2016-03-15  John David Anglin  <danglin@gcc.gnu.org>
 
 	* gcc.c-torture/execute/pr68532.c: Add -fno-common option on

gcc/testsuite/g++.dg/cpp1y/constexpr-instantiate.C

+// PR c++/58281 - Problem with explicitly instantiated constexpr template
+//     functions 
+// { dg-do compile { target c++11 } }
+// { do-additional-options "-fdump-tree-optimized" }
+
+
+template <typename T>
+constexpr bool f (T a)
+{
+  return a == 3;
+}
+
+extern template bool f<int>(int);
+
+bool g (int x) { return f (x); }
+
+template bool f<int>(int);
+
+// Verify that the defintions of both f() and g() are emitted.
+// { dg-final { scan-tree-dump "bool \[fg\](" "optimized" } }