[gcc r9-8716] PR libstdc++/91807

[Ville Voutilainen <ville@gcc.gnu.org>]

https://gcc.gnu.org/g:eb77f6f1b74aa200b70eb0a9e261c9f3b68294a0

commit r9-8716-geb77f6f1b74aa200b70eb0a9e261c9f3b68294a0
Author: Ville Voutilainen <ville.voutilainen@gmail.com>
Date:   Thu Jul 2 22:16:39 2020 +0300

    PR libstdc++/91807
    
            PR libstdc++/91807
            * include/std/variant
            (_Copy_assign_base::operator=(const _Copy_assign_base&):
            Do the move-assignment from a temporary so that the temporary
            is constructed with an explicit index.
            * testsuite/20_util/variant/91807.cc: New.
    
    (cherry picked from commit dbca7a69f276e4829354f87f2747ebff36f6090e)

Diff:
---
 libstdc++-v3/include/std/variant                |  3 ++-
 libstdc++-v3/testsuite/20_util/variant/91807.cc | 35 +++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/variant b/libstdc++-v3/include/std/variant
index 75fb0dc164a..e1882b36700 100644
--- a/libstdc++-v3/include/std/variant
+++ b/libstdc++-v3/include/std/variant
@@ -606,7 +606,8 @@ namespace __variant
 		      this->_M_destructive_copy(__rhs_index, __rhs_mem);
 		    else
 		      __variant_cast<_Types...>(*this)
-			= variant<_Types...>(__rhs_mem);
+			= variant<_Types...>(std::in_place_index<__rhs_index>,
+					     __rhs_mem);
 		  }
 	      }
 	    else
diff --git a/libstdc++-v3/testsuite/20_util/variant/91807.cc b/libstdc++-v3/testsuite/20_util/variant/91807.cc
new file mode 100644
index 00000000000..04bb5d7c807
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/variant/91807.cc
@@ -0,0 +1,35 @@
+// { dg-options "-std=gnu++17" }
+// { dg-do compile { target c++17 } }
+
+// Copyright (C) 2020 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <variant>
+
+struct me_data {
+  me_data() = default;
+
+  me_data(const me_data &) {};
+  me_data(me_data &&) noexcept {};
+  me_data& operator=(const me_data &) = default;
+};
+
+int main() {
+  std::variant<me_data, me_data> v1, v2;
+
+  v2 = v1;
+}