Adjust DG directives in libstdc++ XFAIL test

	* testsuite/20_util/bind/ref_neg.cc: Use effective target instead of
	-std=gnu++11. Add -fno-show-columns to dg-options. Use dg-prune-output
	instead of dg-excess-errors.

From-SVN: r239535

libstdc++-v3/ChangeLog

 2016-08-17  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/20_util/bind/ref_neg.cc: Use effective target instead of
+	-std=gnu++11. Add -fno-show-columns to dg-options. Use dg-prune-output
+	instead of dg-excess-errors.
+
 	* testsuite/26_numerics/headers/cmath/types_std_c++0x_neg.cc: Disable
 	test for C++17.
 	* testsuite/experimental/chrono/value.cc: Avoid ambiguities in C++17.

libstdc++-v3/testsuite/20_util/bind/ref_neg.cc

@@ -17,8 +17,8 @@
 
 // 20.8.9 Function template bind
 
-// { dg-do compile }
-// { dg-options "-std=gnu++11" }
+// { dg-options "-fno-show-column" }
+// { dg-do compile { target c++11 } }
 
 #include <functional>
 
@@ -48,7 +48,8 @@ void test02()
   std::bind(&Inc::f, Inc(), std::ref(dummy))(); // { dg-error  "no match" }
 }
 
-// { dg-excess-errors "reasons for deduction/substitution failures" }
+// Ignore the reasons for deduction/substitution failure in the headers.
+// { dg-prune-output "/include/(functional|bits/invoke.h):" }
 
 int main()
 {