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PR libstdc++/85818 ensure path::preferred_separator is defined 

Because path.cc is compiled with -std=gnu++17 the static constexpr
data member is implicitly 'inline' and so no definition gets emitted
unless it gets used in that translation unit. Other translation units
built as C++11 or C++14 still require a namespace-scope definition of
the variable, so mark the definition as used.

	PR libstdc++/85818
	* src/filesystem/path.cc (path::preferred_separator): Add used
	attribute.
	* testsuite/experimental/filesystem/path/preferred_separator.cc: New.

From-SVN: r260326
This commit is contained in:
Jonathan Wakely 2018-05-17 16:36:25 +01:00 committed by Jonathan Wakely
parent ff03245e00
commit 079638f924
3 changed files with 40 additions and 1 deletions
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5
libstdc++-v3/ChangeLog
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@ -1,5 +1,10 @@
2018-05-17 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/85818
* src/filesystem/path.cc (path::preferred_separator): Add used
attribute.
* testsuite/experimental/filesystem/path/preferred_separator.cc: New.
PR libstdc++/85812
* libsupc++/cxxabi_init_exception.h (__cxa_free_exception): Declare.
* libsupc++/exception_ptr.h (make_exception_ptr) [__cpp_exceptions]:

2
libstdc++-v3/src/filesystem/path.cc
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@ -33,7 +33,7 @@ using fs::path;
fs::filesystem_error::~filesystem_error() = default;
constexpr path::value_type path::preferred_separator;
constexpr path::value_type path::preferred_separator [[gnu::used]];
path&
path::remove_filename()

34
libstdc++-v3/testsuite/experimental/filesystem/path/preferred_separator.cc Normal file
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@ -0,0 +1,34 @@
// 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-options "-O0 -lstdc++fs -std=gnu++11" }
// { dg-do link { target c++11 } }
#include <experimental/filesystem>
std::experimental::filesystem::path::value_type
test01()
{
auto* sep = &std::experimental::filesystem::path::preferred_separator;
return *sep;
}
int
main()
{
test01();
}