[c++ PATCH] PR c++/80682

[Ville Voutilainen]

Tested on Linux-x64, not tested with the full suite yet.

2017-05-09  Ville Voutilainen  <ville.voutilai...@gmail.com>

    gcc/

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

    testsuite/

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

diff --git a/gcc/cp/method.c b/gcc/cp/method.c
index b4c1f60..911f6ee 100644
--- a/gcc/cp/method.c
+++ b/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 (to == void_type_node)
+    return false;
   tree expr;
   if (code == MODIFY_EXPR)
     expr = assignable_expr (to, from);
diff --git a/gcc/testsuite/g++.dg/ext/is_trivially_constructible1.C 
b/gcc/testsuite/g++.dg/ext/is_trivially_constructible1.C
index a5bac7b..bfe17dc 100644
--- a/gcc/testsuite/g++.dg/ext/is_trivially_constructible1.C
+++ b/gcc/testsuite/g++.dg/ext/is_trivially_constructible1.C
@@ -27,10 +27,12 @@ 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_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(D));