1// Copyright (C) 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:   US-ASCII
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)
58#   define _XOPEN_SOURCE_EXTENDED 1
59#endif
60
61/*
62 * There is an issue with turning on _XOPEN_SOURCE_EXTENDED on certain platforms.
63 * A compatibility issue exists between turning on _XOPEN_SOURCE_EXTENDED and using
64 * standard C++ string class. As a result, standard C++ string class needs to be
65 * turned off for the follwing platforms:
66 *  -AIX/VACPP
67 *  -Solaris/GCC
68 */
69#if (U_PLATFORM == U_PF_AIX && !defined(__GNUC__)) || (U_PLATFORM == U_PF_SOLARIS && defined(__GNUC__))
70#   if _XOPEN_SOURCE_EXTENDED && !defined(U_HAVE_STD_STRING)
71#   define U_HAVE_STD_STRING 0
72#   endif
73#endif
74
75#endif  /* __UPOSIXDEFS_H__ */
76