icuSources/common/uposixdefs.h

   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 readlink 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 #endif  /* __UPOSIXDEFS_H__ */