1 // Specific definitions for Darwin -*- C++ -*- 2 3 // Copyright (C) 2004-2022 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 26 #ifndef _GLIBCXX_OS_DEFINES 27 #define _GLIBCXX_OS_DEFINES 1 28 29 // System-specific #define, typedefs, corrections, etc, go here. This 30 // file will come before all others. 31 32 /* Darwin has the pthread routines in libSystem, which every program 33 links to, so there's no need for weak-ness for that. */ 34 #define _GLIBCXX_GTHREAD_USE_WEAK 0 35 36 // On Darwin, in order to enable overriding of operator new and delete, 37 // GCC makes the definition of these functions weak, relies on the 38 // loader to implement weak semantics properly, and uses 39 // -flat_namespace to work around the way that it doesn't. 40 #define _GLIBCXX_WEAK_DEFINITION __attribute__ ((weak)) 41 42 #if defined (__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) \ 43 && (__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1080) 44 // Static initializer macro is absent for Darwin < 11 and buggy in Darwin 11, 45 // see libstdc++/51906. Fixed in Darwin 12 (OS X 10.8). 46 #define _GTHREAD_USE_RECURSIVE_MUTEX_INIT_FUNC 47 #endif 48 49 // Configure checks for nanosleep fail on Darwin, but nanosleep and 50 // sched_yield are always available, so use them. 51 #define _GLIBCXX_USE_NANOSLEEP 1 52 #define _GLIBCXX_USE_SCHED_YIELD 1 53 54 // No support for referencing weak symbols without a definition. 55 #define _GLIBCXX_USE_WEAK_REF 0 56 57 #endif 58