re PR c++/70808 (Spurious -Wzero-as-null-pointer-constant for nullptr_t)

	PR c++/70808
	* g++.dg/warn/Wzero-as-null-pointer-constant-7.C: Require c++11
	effective target.

From-SVN: r259325

gcc/testsuite/ChangeLog

+2018-04-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/70808
+	* g++.dg/warn/Wzero-as-null-pointer-constant-7.C: Require c++11
+	effective target.
+
 2018-04-11  Alexander Monakov  <amonakov@ispras.ru>
 
 	PR target/84301

gcc/testsuite/g++.dg/warn/Wzero-as-null-pointer-constant-7.C

 // PR c++/70808
+// { dg-do compile { target c++11 } }
 // { dg-options "-Wzero-as-null-pointer-constant" }
 
 int* no_warn = {};