| 1 | // Specific definitions for GNU/Linux -*- C++ -*- |
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| 2 | |
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| 3 | // Copyright (C) 2000-2021 Free Software Foundation, Inc. |
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| 4 | // |
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| 5 | // This file is part of the GNU ISO C++ Library. This library is free |
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| 6 | // software; you can redistribute it and/or modify it under the |
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| 7 | // terms of the GNU General Public License as published by the |
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| 8 | // Free Software Foundation; either version 3, or (at your option) |
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| 9 | // any later version. |
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| 10 | |
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| 11 | // This library is distributed in the hope that it will be useful, |
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| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | // GNU General Public License for more details. |
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| 15 | |
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| 16 | // Under Section 7 of GPL version 3, you are granted additional |
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| 17 | // permissions described in the GCC Runtime Library Exception, version |
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| 18 | // 3.1, as published by the Free Software Foundation. |
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| 19 | |
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| 20 | // You should have received a copy of the GNU General Public License and |
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| 21 | // a copy of the GCC Runtime Library Exception along with this program; |
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| 22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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| 23 | // <http://www.gnu.org/licenses/>. |
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| 24 | |
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| 25 | /** @file bits/os_defines.h |
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| 26 | * This is an internal header file, included by other library headers. |
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| 27 | * Do not attempt to use it directly. @headername{iosfwd} |
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| 28 | */ |
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| 29 | |
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| 30 | #ifndef _GLIBCXX_OS_DEFINES |
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| 31 | #define _GLIBCXX_OS_DEFINES 1 |
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| 32 | |
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| 33 | // System-specific #define, typedefs, corrections, etc, go here. This |
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| 34 | // file will come before all others. |
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| 35 | |
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| 36 | // This keeps isanum, et al from being propagated as macros. |
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| 37 | #define __NO_CTYPE 1 |
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| 38 | |
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| 39 | #include <features.h> |
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| 40 | |
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| 41 | // Provide a declaration for the possibly deprecated gets function, as |
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| 42 | // glibc 2.15 and later does not declare gets for ISO C11 when |
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| 43 | // __GNU_SOURCE is defined. |
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| 44 | #if __GLIBC_PREREQ(2,15) && defined(_GNU_SOURCE) |
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| 45 | # undef _GLIBCXX_HAVE_GETS |
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| 46 | #endif |
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| 47 | |
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| 48 | // Glibc 2.23 removed the obsolete isinf and isnan declarations. Check the |
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| 49 | // version dynamically in case it has changed since libstdc++ was configured. |
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| 50 | #define _GLIBCXX_NO_OBSOLETE_ISINF_ISNAN_DYNAMIC __GLIBC_PREREQ(2,23) |
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| 51 | |
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| 52 | #ifdef __linux__ |
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| 53 | # if __GLIBC_PREREQ(2, 27) |
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| 54 | // Since glibc 2.27 Linux' pthread_self() is usable without linking to libpthread. |
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| 55 | # define _GLIBCXX_NATIVE_THREAD_ID pthread_self() |
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| 56 | # else |
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| 57 | // Before then it was in libc.so.6 but not libc.a, and always returns 0, |
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| 58 | // which breaks the invariant this_thread::get_id() != thread::id{}. |
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| 59 | // So only use it if we know the libpthread version is available. |
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| 60 | // Otherwise use (__gthread_t)1 as the ID of the main (and only) thread. |
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| 61 | # define _GLIBCXX_NATIVE_THREAD_ID \ |
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| 62 | (__gthread_active_p() ? __gthread_self() : (__gthread_t)1) |
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| 63 | # endif |
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| 64 | |
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| 65 | # if __GLIBC_PREREQ(2, 34) |
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| 66 | // Since glibc 2.34 all Linux pthreads functions are usable without linking to |
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| 67 | // libpthread. |
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| 68 | # define _GLIBCXX_GTHREAD_USE_WEAK 0 |
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| 69 | # endif |
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| 70 | #endif |
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| 71 | |
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| 72 | #endif |
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| 73 | |
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