re PR libstdc++/64651 (std::rethrow_exception not found by ADL)

	PR libstdc++/64651
	* libsupc++/exception_ptr.h (rethrow_exception): Add using-declaration
	to __exception_ptr namespace.
	* testsuite/18_support/exception_ptr/rethrow_exception.cc: Test ADL.
	Remove unnecessary test variables.

From-SVN: r230147

libstdc++-v3/ChangeLog

+2015-11-11  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/64651
+	* libsupc++/exception_ptr.h (rethrow_exception): Add using-declaration
+	to __exception_ptr namespace.
+	* testsuite/18_support/exception_ptr/rethrow_exception.cc: Test ADL.
+	Remove unnecessary test variables.
+
 2015-11-10  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/68190

libstdc++-v3/libsupc++/exception_ptr.h

@@ -68,6 +68,8 @@ namespace std
 
   namespace __exception_ptr
   {
+    using std::rethrow_exception;
+
     /**
      *  @brief An opaque pointer to an arbitrary exception.
      *  @ingroup exceptions

libstdc++-v3/testsuite/18_support/exception_ptr/rethrow_exception.cc

@@ -30,7 +30,6 @@
 
 void test01()
 {
-  bool test __attribute__((unused)) = true;
   using namespace std;
 
   try {
@@ -54,7 +53,6 @@ void test02()
 
 void test03()
 {
-  bool test __attribute__((unused)) = true;
   using namespace std;
 
   exception_ptr ep;
@@ -71,7 +69,6 @@ void test03()
 
 void test04()
 {
-  bool test __attribute__((unused)) = true;
   using namespace std;
 
   // Weave the exceptions in an attempt to confuse the machinery.
@@ -103,12 +100,23 @@ void test04()
   }
 }
 
+void test05()
+{
+  // libstdc++/64651 std::rethrow_exception not found by ADL
+  // This is not required to work but is a conforming extension.
+  try {
+    rethrow_exception(std::make_exception_ptr(0));
+  } catch(...) {
+  }
+}
+
 int main()
 {
   test01();
   test02();
   test03();
   test04();
+  test05();
 
   return 0;
 }