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71 lines
2.6 KiB
71 lines
2.6 KiB
3 years ago
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// Specific definitions for GNU/Linux -*- C++ -*-
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// Copyright (C) 2000-2021 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 bits/os_defines.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{iosfwd}
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*/
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#ifndef _GLIBCXX_OS_DEFINES
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#define _GLIBCXX_OS_DEFINES 1
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// System-specific #define, typedefs, corrections, etc, go here. This
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// file will come before all others.
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// This keeps isanum, et al from being propagated as macros.
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#define __NO_CTYPE 1
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#include <features.h>
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// Provide a declaration for the possibly deprecated gets function, as
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// glibc 2.15 and later does not declare gets for ISO C11 when
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// __GNU_SOURCE is defined.
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#if __GLIBC_PREREQ(2,15) && defined(_GNU_SOURCE)
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# undef _GLIBCXX_HAVE_GETS
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#endif
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// Glibc 2.23 removed the obsolete isinf and isnan declarations. Check the
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// version dynamically in case it has changed since libstdc++ was configured.
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#define _GLIBCXX_NO_OBSOLETE_ISINF_ISNAN_DYNAMIC __GLIBC_PREREQ(2,23)
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#if __GLIBC_PREREQ(2, 27)
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// Since glibc 2.27 pthread_self() is usable without linking to libpthread.
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# define _GLIBCXX_NATIVE_THREAD_ID pthread_self()
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#else
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// Before then it was in libc.so.6 but not libc.a, and always returns 0,
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// which breaks the invariant this_thread::get_id() != thread::id{}.
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// So only use it if we know the libpthread version is available.
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// Otherwise use (__gthread_t)1 as the ID of the main (and only) thread.
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# define _GLIBCXX_NATIVE_THREAD_ID \
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(__gthread_active_p() ? __gthread_self() : (__gthread_t)1)
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#endif
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#if __GLIBC_PREREQ(2, 34)
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// Since glibc 2.34 all pthreads functions are usable without linking to
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// libpthread.
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# define _GLIBCXX_GTHREAD_USE_WEAK 0
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#endif
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#endif
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