cplusplus.C: Test that __cplusplus is equal to 201703L.

	* g++.dg/cpp1z/cplusplus.C: Test that __cplusplus is equal to 201703L.
	* g++.dg/cpp1z/cplusplus_1z.C: New test.

From-SVN: r253029

gcc/testsuite/ChangeLog

+2017-09-20  Jakub Jelinek  <jakub@redhat.com>
+
+	* g++.dg/cpp1z/cplusplus.C: Test that __cplusplus is equal to 201703L.
+	* g++.dg/cpp1z/cplusplus_1z.C: New test.
+
 2017-09-20  Sebastian Peryt  <sebastian.peryt@intel.com>
 
 	* gcc.target/i386/builtin_target.c: Test knm.

gcc/testsuite/g++.dg/cpp1z/cplusplus.C

 // { dg-do compile }
 // { dg-options "-std=c++17" }
 
-#if __cplusplus <= 201402L
-#error "__cplusplus <= 201402L"
+#if __cplusplus != 201703L
+#error "__cplusplus != 201703L"
 #endif

gcc/testsuite/g++.dg/cpp1z/cplusplus_1z.C

+// { dg-do compile }
+// { dg-options "-std=c++1z" }
+
+#if __cplusplus != 201703L
+#error "__cplusplus != 201703L"
+#endif