icuSources/common/uposixdefs.h

   1 /*
   2 *******************************************************************************
   3 *   Copyright (C) 2011-2015, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 *******************************************************************************
   6 *   file name:  uposixdefs.h
   7 *   encoding:   US-ASCII
   8 *   tab size:   8 (not used)
   9 *   indentation:4
  10 *
  11 *   created on: 2011jul25
  12 *   created by: Markus W. Scherer
  13 *
  14 *   Common definitions for implementation files working with POSIX functions.
  15 *   *Important*: #include this file before any other header files!
  16 */
  17
  18 #ifndef __UPOSIXDEFS_H__
  19 #define __UPOSIXDEFS_H__
  20
  21 /*
  22  * Define _XOPEN_SOURCE for access to POSIX functions.
  23  *
  24  * We cannot use U_PLATFORM from platform.h/utypes.h because
  25  * "The Open Group Base Specifications"
  26  * chapter "2.2 The Compilation Environment" says:
  27  * "In the compilation of an application that #defines a feature test macro
  28  * specified by IEEE Std 1003.1-2001,
  29  * no header defined by IEEE Std 1003.1-2001 shall be included prior to
  30  * the definition of the feature test macro."
  31  */
  32 #ifdef _XOPEN_SOURCE
  33     /* Use the predefined value. */
  34 #else
  35     /*
  36      * Version 6.0:
  37      * The Open Group Base Specifications Issue 6 (IEEE Std 1003.1, 2004 Edition)
  38      * also known as
  39      * SUSv3 = Open Group Single UNIX Specification, Version 3 (UNIX03)
  40      *
  41      * Note: This definition used to be in C source code (e.g., putil.c)
  42      * and define _XOPEN_SOURCE to different values depending on __STDC_VERSION__.
  43      * In C++ source code (e.g., putil.cpp), __STDC_VERSION__ is not defined at all.
  44      */
  45 #   define _XOPEN_SOURCE 600
  46 #endif
  47
  48 /*
  49  * Make sure things like readlink and such functions work.
  50  * Poorly upgraded Solaris machines can't have this defined.
  51  * Cleanly installed Solaris can use this #define.
  52  *
  53  * z/OS needs this definition for timeval and to get usleep.
  54  */
  55 #if !defined(_XOPEN_SOURCE_EXTENDED)
  56 #   define _XOPEN_SOURCE_EXTENDED 1
  57 #endif
  58
  59 /*
  60  * There is an issue with turning on _XOPEN_SOURCE_EXTENDED on certain platforms.
  61  * A compatibility issue exists between turning on _XOPEN_SOURCE_EXTENDED and using
  62  * standard C++ string class. As a result, standard C++ string class needs to be
  63  * turned off for the follwing platforms:
  64  *  -AIX/VACPP
  65  *  -Solaris/GCC
  66  */
  67 #if (U_PLATFORM == U_PF_AIX && !defined(__GNUC__)) || (U_PLATFORM == U_PF_SOLARIS && defined(__GNUC__))
  68 #   if _XOPEN_SOURCE_EXTENDED && !defined(U_HAVE_STD_STRING)
  69 #   define U_HAVE_STD_STRING 0
  70 #   endif
  71 #endif
  72
  73 #endif  /* __UPOSIXDEFS_H__ */