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diff --git a/gdb/unittests/basic_string_view/capacity/1.cc b/gdb/unittests/basic_string_view/capacity/1.cc
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+// { dg-options "-std=gnu++17" }
+
+// Copyright (C) 2013-2018 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/>.
+
+// string_view size, length
+
+#include <string_view>
+#include <cstring>
+#include <testsuite_hooks.h>
+
+template<typename T>
+ struct A { };
+
+template<typename T>
+ bool
+ operator==(const A<T>&, const A<T>&) { return true; }
+
+template<typename T>
+ bool
+ operator<(const A<T>&, const A<T>&) { return true; }
+
+struct B { };
+
+// char_traits specialization
+namespace std
+{
+ template<>
+ struct char_traits<A<B> >
+ {
+ typedef A<B> char_type;
+ // Unsigned as wint_t in unsigned.
+ typedef unsigned long int_type;
+ typedef streampos pos_type;
+ typedef streamoff off_type;
+ typedef mbstate_t state_type;
+
+ static void
+ assign(char_type& __c1, const char_type& __c2)
+ { __c1 = __c2; }
+
+ static bool
+ eq(const char_type& __c1, const char_type& __c2)
+ { return __c1 == __c2; }
+
+ static bool
+ lt(const char_type& __c1, const char_type& __c2)
+ { return __c1 < __c2; }
+
+ static int
+ compare(const char_type* __s1, const char_type* __s2, size_t __n)
+ {
+ for (size_t __i = 0; __i < __n; ++__i)
+ if (!eq(__s1[__i], __s2[__i]))
+ return lt(__s1[__i], __s2[__i]) ? -1 : 1;
+ return 0;
+ }
+
+ static size_t
+ length(const char_type* __s)
+ {
+ const char_type* __p = __s;
+ while (__p)
+ ++__p;
+ return (__p - __s);
+ }
+
+ static const char_type*
+ find(const char_type* __s, size_t __n, const char_type& __a)
+ {
+ for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
+ if (*__p == __a) return __p;
+ return 0;
+ }
+
+ static char_type*
+ move(char_type* __s1, const char_type* __s2, size_t __n)
+ { return (char_type*) memmove(__s1, __s2, __n * sizeof(char_type)); }
+
+ static char_type*
+ copy(char_type* __s1, const char_type* __s2, size_t __n)
+ { return (char_type*) memcpy(__s1, __s2, __n * sizeof(char_type)); }
+
+ static char_type*
+ assign(char_type* __s, size_t __n, char_type __a)
+ {
+ for (char_type* __p = __s; __p < __s + __n; ++__p)
+ assign(*__p, __a);
+ return __s;
+ }
+
+ static char_type
+ to_char_type(const int_type&)
+ { return char_type(); }
+
+ static int_type
+ to_int_type(const char_type&) { return int_type(); }
+
+ static bool
+ eq_int_type(const int_type& __c1, const int_type& __c2)
+ { return __c1 == __c2; }
+
+ static int_type
+ eof() { return static_cast<int_type>(-1); }
+
+ static int_type
+ not_eof(const int_type& __c)
+ { return eq_int_type(__c, eof()) ? int_type(0) : __c; }
+ };
+} // namespace std
+
+void
+test01()
+{
+ std::basic_string_view<A<B>> str02;
+ typedef std::basic_string_view< A<B> >::size_type size_type_o;
+ size_type_o sz03;
+ size_type_o sz04;
+
+ // non-POD types: size, length, max_size, empty()
+ bool b01 = str02.empty();
+ VERIFY( b01 == true );
+ sz03 = str02.size();
+ sz04 = str02.length();
+ VERIFY( sz03 == sz04 );
+ str02.data();
+ sz03 = str02.size();
+ sz04 = str02.length();
+ VERIFY( sz03 == sz04 );
+
+ sz03 = str02.max_size();
+ VERIFY( sz03 >= sz04 );
+
+ sz03 = str02.size();
+ str02 = {};
+ b01 = str02.empty();
+ VERIFY( b01 == true );
+ sz04 = str02.size();
+ VERIFY( sz03 >= sz04 );
+}
+
+int
+main()
+{
+ test01();
+
+ return 0;
+}