2018-05-14 Jonathan Wakely <jwakely@redhat.com>
+ PR libstdc++/81256
+ * include/bits/fstream.tcc (basic_filebuf::close): Do not swallow
+ exceptions from _M_terminate_output().
+ * include/std/fstream (basic_filebuf::~basic_filebuf): Swallow any
+ exceptions from close().
+ * testsuite/27_io/basic_filebuf/close/81256.cc: New.
+
* include/bits/valarray_array.h (__valarray_get_memory): Remove.
(__valarray_get_storage): Call operator new directly. Remove ignored
top-level restrict qualifier and add malloc attribute instead.
--- /dev/null
+// Copyright (C) 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/>.
+
+// { dg-do run { target c++11 } }
+
+#include <fstream>
+#include <locale>
+#include <testsuite_hooks.h>
+
+struct E : std::runtime_error
+{
+ E() : runtime_error("") { }
+};
+
+struct Cvt : std::codecvt<wchar_t, char, std::mbstate_t>
+{
+ explicit Cvt(size_t refs) : codecvt(refs) { }
+
+ mutable int exceptions_thrown = 0;
+
+private:
+ int
+ do_encoding() const noexcept override
+ { return -1; }
+
+ bool
+ do_always_noconv() const noexcept override
+ { return false; }
+
+ result
+ do_unshift(state_type&, char*, char*, char*&) const override
+ {
+ ++exceptions_thrown;
+ throw E();
+ }
+};
+
+struct filebuf : std::basic_filebuf<wchar_t>
+{
+ explicit filebuf(Cvt* c)
+ {
+ std::locale loc(std::locale::classic(), c);
+ imbue(loc);
+ }
+};
+
+void
+test01()
+{
+ // This facet needs to still be valid when ~basic_filebuf runs:
+ Cvt conv{1};
+ {
+ filebuf fb(&conv);
+ fb.open("output.txt", std::wios::out);
+ fb.sputn(L"x", 1);
+
+ bool caught = false;
+ try
+ {
+ /* [filebuf.members] p7: If one of these calls throws an exception,
+ * the exception is caught and rethrown after closing the file. */
+ fb.close();
+ }
+ catch (const E&)
+ {
+ caught = true;
+ }
+ VERIFY( conv.exceptions_thrown == 1 );
+ VERIFY( caught );
+ }
+ VERIFY( conv.exceptions_thrown == 1 );
+}
+
+void
+test02()
+{
+ // This facet needs to still be valid when ~basic_filebuf runs:
+ Cvt conv{1};
+ {
+ filebuf fb(&conv);
+ fb.open("output.txt", std::wios::out);
+ fb.sputn(L"x", 1);
+ /* [filebuf.cons] p5: If an exception occurs during the destruction
+ * of the object, including the call to close(), the exception is
+ * caught but not rethrown. */
+ }
+ VERIFY( conv.exceptions_thrown == 1 );
+}
+
+int
+main()
+{
+ test01();
+ test02();
+}