Patrick Palka
ec59848074
When linking with a static library, the linker seems to discard a constituent .o object (including its global initializers) if nothing defined in the object is referenced by the program (unless e.g. --whole-archive is used). This behavior breaks iostream with static libstdc++.a (on systems that support init priorities) because we define the global initializer for the standard stream objects in a separate TU (ios_init.cc) from the stream object definitions (globals_io.cc). This patch fixes this by moving the stream initialization object into the same TU that defines the stream objects, so that any use of the streams prevents the linker from discarding this global initializer. PR libstdc++/107701 libstdc++-v3/ChangeLog: * include/std/iostream (__ioinit): Adjust comment. * src/c++98/globals_io.cc: Include "io_base_init.h" here instead of ... * src/c++98/ios_init.cc: ... here. * src/c++98/ios_base_init.h (__ioinit): More comments. * testsuite/17_intro/static.cc: dg-do run instead of just link.
86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
// Standard iostream objects -*- C++ -*-
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// Copyright (C) 1997-2022 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file include/iostream
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* This is a Standard C++ Library header.
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*/
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//
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// ISO C++ 14882: 27.3 Standard iostream objects
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//
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#ifndef _GLIBCXX_IOSTREAM
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#define _GLIBCXX_IOSTREAM 1
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#pragma GCC system_header
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#include <bits/requires_hosted.h> // iostreams
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#include <bits/c++config.h>
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#include <ostream>
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#include <istream>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @name Standard Stream Objects
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*
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* The `<iostream>` header declares the eight *standard stream objects*.
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* For other declarations, see
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* http://gcc.gnu.org/onlinedocs/libstdc++/manual/io.html
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* and the @link iosfwd I/O forward declarations @endlink
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*
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* They are required by default to cooperate with the global C
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* library's `FILE` streams, and to be available during program
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* startup and termination. For more information, see the section of the
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* manual linked to above.
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*/
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///@{
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extern istream cin; ///< Linked to standard input
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extern ostream cout; ///< Linked to standard output
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extern ostream cerr; ///< Linked to standard error (unbuffered)
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extern ostream clog; ///< Linked to standard error (buffered)
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#ifdef _GLIBCXX_USE_WCHAR_T
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extern wistream wcin; ///< Linked to standard input
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extern wostream wcout; ///< Linked to standard output
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extern wostream wcerr; ///< Linked to standard error (unbuffered)
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extern wostream wclog; ///< Linked to standard error (buffered)
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#endif
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///@}
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// For construction of filebuffers for cout, cin, cerr, clog et. al.
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// When the init_priority attribute is usable, we do this initialization
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// in the compiled library instead (src/c++98/globals_io.cc).
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#if !__has_attribute(__init_priority__)
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static ios_base::Init __ioinit;
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#endif
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif /* _GLIBCXX_IOSTREAM */
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