re PR c++/80682 (__is_trivially_constructible(void, int) returns true.)

PR c++/80682

cp/

PR c++/80682
* method.c (is_trivially_xible): Reject void types.

testsuite/

PR c++/80682
* g++.dg/ext/is_trivially_constructible1.C: Add tests for void target.

From-SVN: r247880

gcc/cp/ChangeLog

+2017-05-11  Ville Voutilainen  <ville.voutilainen@gmail.com>
+
+	PR c++/80682
+	* method.c (is_trivially_xible): Reject void types.
+
 2017-05-10  Nathan Sidwell  <nathan@acm.org>
 
 	* class.c (handle_using_decl): Always use OVL_CURRENT.

gcc/cp/method.c

@@ -1207,6 +1207,8 @@ constructible_expr (tree to, tree from)
 bool
 is_trivially_xible (enum tree_code code, tree to, tree from)
 {
+  if (VOID_TYPE_P (to))
+    return false;
   tree expr;
   if (code == MODIFY_EXPR)
     expr = assignable_expr (to, from);

gcc/testsuite/g++.dg/ext/is_trivially_constructible1.C

@@ -27,10 +27,18 @@ SA(!__is_trivially_constructible(C,C&));
 SA(__is_trivially_assignable(C,C&));
 SA(!__is_trivially_assignable(C,C));
 SA(!__is_trivially_assignable(C,C&&));
+SA(!__is_trivially_assignable(void,int));
+SA(!__is_trivially_assignable(const void,int));
+SA(!__is_trivially_assignable(volatile void,int));
+SA(!__is_trivially_assignable(const volatile void,int));
 
 SA(__is_trivially_constructible(int,int));
 SA(__is_trivially_constructible(int,double));
 SA(!__is_trivially_constructible(int,B));
+SA(!__is_trivially_constructible(void,int));
+SA(!__is_trivially_constructible(const void,int));
+SA(!__is_trivially_constructible(volatile void,int));
+SA(!__is_trivially_constructible(const volatile void,int));
 
 SA(!__is_trivially_constructible(D));