uposixdefs.h (2827B)
1 // © 2016 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html 3 /* 4 ******************************************************************************* 5 * Copyright (C) 2011-2015, International Business Machines 6 * Corporation and others. All Rights Reserved. 7 ******************************************************************************* 8 * file name: uposixdefs.h 9 * encoding: UTF-8 10 * tab size: 8 (not used) 11 * indentation:4 12 * 13 * created on: 2011jul25 14 * created by: Markus W. Scherer 15 * 16 * Common definitions for implementation files working with POSIX functions. 17 * *Important*: #include this file before any other header files! 18 */ 19 20 #ifndef __UPOSIXDEFS_H__ 21 #define __UPOSIXDEFS_H__ 22 23 /* 24 * Define _XOPEN_SOURCE for access to POSIX functions. 25 * 26 * We cannot use U_PLATFORM from platform.h/utypes.h because 27 * "The Open Group Base Specifications" 28 * chapter "2.2 The Compilation Environment" says: 29 * "In the compilation of an application that #defines a feature test macro 30 * specified by IEEE Std 1003.1-2001, 31 * no header defined by IEEE Std 1003.1-2001 shall be included prior to 32 * the definition of the feature test macro." 33 */ 34 #ifdef _XOPEN_SOURCE 35 /* Use the predefined value. */ 36 #else 37 /* 38 * Version 6.0: 39 * The Open Group Base Specifications Issue 6 (IEEE Std 1003.1, 2004 Edition) 40 * also known as 41 * SUSv3 = Open Group Single UNIX Specification, Version 3 (UNIX03) 42 * 43 * Note: This definition used to be in C source code (e.g., putil.c) 44 * and define _XOPEN_SOURCE to different values depending on __STDC_VERSION__. 45 * In C++ source code (e.g., putil.cpp), __STDC_VERSION__ is not defined at all. 46 */ 47 # define _XOPEN_SOURCE 600 48 #endif 49 50 /* 51 * Make sure things like realpath and such functions work. 52 * Poorly upgraded Solaris machines can't have this defined. 53 * Cleanly installed Solaris can use this #define. 54 * 55 * z/OS needs this definition for timeval and to get usleep. 56 */ 57 #if !defined(_XOPEN_SOURCE_EXTENDED) && defined(__TOS_MVS__) 58 # define _XOPEN_SOURCE_EXTENDED 1 59 #endif 60 61 /** 62 * Solaris says: 63 * "...it is invalid to compile an XPG6 or a POSIX.1-2001 application with anything other 64 * than a c99 or later compiler." 65 * Apparently C++11 is not "or later". Work around this. 66 */ 67 #if defined(__cplusplus) && (defined(sun) || defined(__sun)) && !defined (_STDC_C99) 68 # define _STDC_C99 69 #endif 70 71 #if !defined _POSIX_C_SOURCE && \ 72 defined(__APPLE__) && defined(__MACH__) && !defined(__clang__) 73 // Needed to prevent EOWNERDEAD issues with GCC on Mac 74 #define _POSIX_C_SOURCE 200809L 75 #endif 76 77 /* Prevent _XOPEN_SOURCE from breaking build on macOS when aligned_alloc exists. */ 78 #if defined(__APPLE__) && !defined(_DARWIN_C_SOURCE) 79 # define _DARWIN_C_SOURCE 80 #endif 81 82 #endif /* __UPOSIXDEFS_H__ */