--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/cmp.cc	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,79 @@
+// { dg-options "-std=gnu++17" }
+// { dg-do run { 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/>.
+
+// C++17 30.10.8.6 path non-member functions [fs.path.nonmember]
+
+#include <filesystem>
+#include <testsuite_hooks.h>
+#include <testsuite_fs.h>
+
+using std::filesystem::path;
+
+void
+test01()
+{
+  path p("/foo/bar");
+  VERIFY( p == p );
+  VERIFY( p == "/foo//bar" );
+
+  path q("/foo/baz");
+  VERIFY( p < q );
+  VERIFY( q > p );
+
+  path r("/foo/bar/.");
+  VERIFY( p < r );
+
+  VERIFY( path("a/b/") == path("a/b//") );
+}
+
+void
+test02()
+{
+  const path p0 = "/a/a/b/b";
+  for (const path& p : __gnu_test::test_paths)
+  {
+    VERIFY( p.compare(p) == 0 );
+    int cmp = p.compare(p0);
+    if (cmp == 0)
+      VERIFY( p0 == p );
+    else if (cmp < 0)
+      VERIFY( p0 > p );
+    else if (cmp > 0)
+      VERIFY( p0 < p );
+  }
+}
+
+void
+test03()
+{
+  VERIFY( path("/") == path("////") );
+  VERIFY( path("/a") > path("/") );
+  VERIFY( path("/") < path("/a") );
+  VERIFY( path("/ab") > path("/a") );
+  VERIFY( path("/ab") > path("/a/b") );
+}
+
+int
+main()
+{
+  test01();
+  test02();
+  test03();
+}