PR c++/78495 - wrong code inherited ctor and invisi-ref parm

	PR c++/78495 - wrong code inherited ctor and invisi-ref parm
	* cp-gimplify.c (cp_generize_r): Don't skip thunks.

	PR c++/79495
	* g++.dg/cpp1z/inh-ctor38.C: New.

From-SVN: r244728

gcc/cp/ChangeLog

+2017-01-20  Nathan Sidwell  <nathan@acm.org>
+
+	PR c++/78495 - wrong code inherited ctor and invisi-ref parm
+	* cp-gimplify.c (cp_generize_r): Don't skip thunks.
+
 2017-01-20  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c++/77829

gcc/cp/cp-gimplify.c

@@ -1103,15 +1103,7 @@ cp_genericize_r (tree *stmt_p, int *walk_subtrees, void *data)
       && omp_var_to_track (stmt))
     omp_cxx_notice_variable (wtd->omp_ctx, stmt);
 
-  /* Don't dereference parms in a thunk, pass the references through. */
-  if ((TREE_CODE (stmt) == CALL_EXPR && CALL_FROM_THUNK_P (stmt))
-      || (TREE_CODE (stmt) == AGGR_INIT_EXPR && AGGR_INIT_FROM_THUNK_P (stmt)))
-    {
-      *walk_subtrees = 0;
-      return NULL;
-    }
-
-  /* Otherwise, do dereference invisible reference parms.  */
+  /* Dereference invisible reference parms.  */
   if (wtd->handle_invisiref_parm_p && is_invisiref_parm (stmt))
     {
       *stmt_p = convert_from_reference (stmt);

gcc/testsuite/ChangeLog

+2017-01-20  Nathan Sidwell  <nathan@acm.org>
+
+	PR c++/79495
+	* g++.dg/cpp1z/inh-ctor38.C: New.
+
 2017-01-20  Marek Polacek  <polacek@redhat.com>
 
 	PR c/79152

gcc/testsuite/g++.dg/cpp1z/inh-ctor38.C

+// { dg-do run { target c++11 } }
+// PR78495 failed to propagate pass-by-value struct to base ctor.
+
+struct Ptr {
+  void *ptr = 0;
+
+  Ptr() {}
+  Ptr(Ptr const&) = delete;
+  Ptr(Ptr&& other) : ptr (other.ptr) {}
+};
+
+struct Base {
+  Ptr val;
+  Base(Ptr val_) : val(static_cast<Ptr&&>(val_)) {}
+};
+
+struct Derived: Base {
+  using Base::Base;
+};
+
+void *Foo () {
+  Ptr ptr;
+
+  Derived d(static_cast<Ptr&&>(ptr));
+
+  return d.val.ptr;
+}
+
+int main () {
+  return Foo () != 0;
+}