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

/cp
2018-04-10  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/70808
	* init.c (build_zero_init_1): Handle NULLPTR_TYPE_P being true of
	the type like TYPE_PTR_OR_PTRMEM_P.

/testsuite
2018-04-10  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/70808
	* g++.dg/warn/Wzero-as-null-pointer-constant-7.C: New.

From-SVN: r259303

gcc/cp/ChangeLog

+2018-04-10  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/70808
+	* init.c (build_zero_init_1): Handle NULLPTR_TYPE_P being true of
+	the type like TYPE_PTR_OR_PTRMEM_P.
+
 2018-04-10  Jason Merrill  <jason@redhat.com>
 
 	PR debug/65821 - wrong location for main().

gcc/cp/init.c

@@ -180,7 +180,7 @@ build_zero_init_1 (tree type, tree nelts, bool static_storage_p,
        items with static storage duration that are not otherwise
        initialized are initialized to zero.  */
     ;
-  else if (TYPE_PTR_OR_PTRMEM_P (type))
+  else if (TYPE_PTR_OR_PTRMEM_P (type) || NULLPTR_TYPE_P (type))
     init = fold (convert (type, nullptr_node));
   else if (SCALAR_TYPE_P (type))
     init = fold (convert (type, integer_zero_node));

gcc/testsuite/ChangeLog

+2018-04-10  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/70808
+	* g++.dg/warn/Wzero-as-null-pointer-constant-7.C: New.
+
 2018-04-10  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* gcc.target/powerpc/dfmode_off.c: Add -fno-asynchronous-unwind-tables.

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

+// PR c++/70808
+// { dg-options "-Wzero-as-null-pointer-constant" }
+
+int* no_warn = {};
+decltype( nullptr ) warn = {};