[patch] c++/63619 Use -Wdelete-incomplete for "deleting 'void' is undefined" warning

[Jonathan Wakely]

Tested x86_64-linux. OK for trunk?

commit c3ce106375d17223bacaaccbf36bd15fcef3f560
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Thu Oct 23 18:11:22 2014 +0100

    gcc/cp:
    	PR c++/63619
    	* decl2.c (delete_sanity): Use OPT_Wdelete_incomplete in warning.
    
    gcc/testsuite:
    	PR c++/63619
    	* g++.dg/warn/Wdelete-incomplete-3.C: New.

diff --git a/gcc/cp/decl2.c b/gcc/cp/decl2.c
index 4be4847..60c8a63 100644
--- a/gcc/cp/decl2.c
+++ b/gcc/cp/decl2.c
@@ -478,7 +478,7 @@ delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete,
   /* Deleting ptr to void is undefined behavior [expr.delete/3].  */
   if (VOID_TYPE_P (TREE_TYPE (type)))
     {
-      warning (0, "deleting %qT is undefined", type);
+      warning (OPT_Wdelete_incomplete, "deleting %qT is undefined", type);
       doing_vec = 0;
     }
 
diff --git a/gcc/testsuite/g++.dg/warn/Wdelete-incomplete-3.C b/gcc/testsuite/g++.dg/warn/Wdelete-incomplete-3.C
new file mode 100644
index 0000000..2202d60
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/Wdelete-incomplete-3.C
@@ -0,0 +1,6 @@
+// PR c++/63619
+
+int main() {
+   void* p;
+   delete p;    // { dg-warning "undefined" }
+}