1/*
2*******************************************************************************
3*   Copyright (C) 2011-2012, 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__ */
74