From 5ebcc5477a59dbe51c7e1130a2b751a2a1d89574 Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Sun, 18 Jun 2017 00:25:15 -0400
Subject: [PATCH] PR c++/70844 - -Wuseless-cast and inheriting constructor.
* method.c (forward_parm): Suppress warn_useless_cast.
From-SVN: r249344
---
gcc/cp/ChangeLog | 5 +++++
gcc/cp/method.c | 1 +
gcc/testsuite/g++.dg/cpp0x/inh-ctor27.C | 13 +++++++++++++
3 files changed, 19 insertions(+)
create mode 100644 gcc/testsuite/g++.dg/cpp0x/inh-ctor27.C
diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index dba5e4d0ddbf..d0825743e45e 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2017-06-17 Jason Merrill <jason@redhat.com>
+
+ PR c++/70844 - -Wuseless-cast and inheriting constructor.
+ * method.c (forward_parm): Suppress warn_useless_cast.
+
2017-06-16 Jason Merrill <jason@redhat.com>
PR c++/81045 - Wrong type-dependence with auto return type.
diff --git a/gcc/cp/method.c b/gcc/cp/method.c
index 9541fcb91611..fe4b2afe7db8 100644
--- a/gcc/cp/method.c
+++ b/gcc/cp/method.c
@@ -486,6 +486,7 @@ forward_parm (tree parm)
type = PACK_EXPANSION_PATTERN (type);
if (TREE_CODE (type) != REFERENCE_TYPE)
type = cp_build_reference_type (type, /*rval=*/true);
+ warning_sentinel w (warn_useless_cast);
exp = build_static_cast (type, exp, tf_warning_or_error);
if (DECL_PACK_P (parm))
exp = make_pack_expansion (exp);
diff --git a/gcc/testsuite/g++.dg/cpp0x/inh-ctor27.C b/gcc/testsuite/g++.dg/cpp0x/inh-ctor27.C
new file mode 100644
index 000000000000..ef2ada17d516
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/inh-ctor27.C
@@ -0,0 +1,13 @@
+// PR c++/70844
+// { dg-options -Wuseless-cast }
+// { dg-do compile { target c++11 } }
+
+struct base {
+ base (int const &);
+};
+
+struct derived : public base {
+ using base::base;
+};
+
+derived d(0);
--
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