Added further API for intercepting deletion and content insertion

[wxWidgets.git] / include / wx / platform.h

/**
* Name:        wx/platform.h
* Purpose:     define the OS and compiler identification macros
* Author:      Vadim Zeitlin
* Modified by:
* Created:     29.10.01 (extracted from wx/defs.h)
* RCS-ID:      $Id$
* Copyright:   (c) 1997-2001 Vadim Zeitlin
* Licence:     wxWindows licence
*/

/* THIS IS A C FILE, DON'T USE C++ FEATURES (IN PARTICULAR COMMENTS) IN IT */

#ifndef _WX_PLATFORM_H_
#define _WX_PLATFORM_H_



/*
    Codewarrior doesn't define any Windows symbols until some headers
    are included
*/
#ifdef __MWERKS__
#   include <stddef.h>
#endif

#ifdef __WXMAC_XCODE__
#    include <unistd.h>
#    include <TargetConditionals.h>
#    include <AvailabilityMacros.h>
#    include "wx/osx/config_xcode.h"
#    ifndef __WXOSX__
#        define __WXOSX__ 1
#    endif
#    ifndef __WXMAC__
#        define __WXMAC__ 1
#    endif
#endif

/*
   first define Windows symbols if they're not defined on the command line: we
   can autodetect everything we need if _WIN32 is defined
 */
#if defined(__CYGWIN__) && defined(__WINDOWS__)
#    ifndef __WXMSW__
#        define __WXMSW__
#    endif
#endif

#if defined(_WIN64)
#    ifndef _WIN32
        /*
            a lot of code (mistakenly) uses #ifdef _WIN32 to either test for
            Windows or to test for !__WIN16__, so we must define _WIN32 for
            Win64 as well to ensure that the existing code continues to work.
         */
#       define _WIN32
#   endif /* !_WIN32 */

#   ifndef __WIN64__
#       define __WIN64__
#   endif /* !__WIN64__ */
#endif /* _WIN64 */

#if (defined(_WIN32) || defined(WIN32) || defined(__NT__) || defined(__WXWINCE__)) \
    && !defined(__WXMOTIF__) && !defined(__WXGTK__) && !defined(__WXX11__)
#    ifndef __WXMSW__
#        define __WXMSW__
#    endif
#endif /* Win32 */

#if defined(__WXMSW__)
#   if !defined(__WINDOWS__)
#       define __WINDOWS__
#   endif

#   ifndef _WIN32
#        define _WIN32
#   endif

#   ifndef WIN32
#        define WIN32
#   endif

#   ifndef __WIN32__
#        define __WIN32__
#   endif
#endif /* __WXMSW__ */

/* detect MS SmartPhone */
#if defined( WIN32_PLATFORM_WFSP )
#   ifndef __SMARTPHONE__
#       define __SMARTPHONE__
#   endif
#   ifndef __WXWINCE__
#       define __WXWINCE__
#   endif
#endif

/* detect PocketPC */
#if defined( WIN32_PLATFORM_PSPC )
#   ifndef __POCKETPC__
#       define __POCKETPC__
#   endif
#   ifndef __WXWINCE__
#       define __WXWINCE__
#   endif
#endif

/* detect Standard WinCE SDK */
#if defined( WCE_PLATFORM_STANDARDSDK )
#   ifndef __WINCE_STANDARDSDK__
#       define __WINCE_STANDARDSDK__
#   endif
#   ifndef __WXWINCE__
#       define __WXWINCE__
#   endif
#endif

#if defined(_WIN32_WCE) && !defined(WIN32_PLATFORM_WFSP) && !defined(WIN32_PLATFORM_PSPC)
#   if (_WIN32_WCE >= 400)
#       ifndef __WINCE_NET__
#           define __WINCE_NET__
#       endif
#   elif (_WIN32_WCE >= 200)
#       ifndef __HANDHELDPC__
#           define __HANDHELDPC__
#       endif
#   endif
#   ifndef __WXWINCE__
#       define __WXWINCE__
#   endif
#endif

#if defined(__WXWINCE__) && defined(_MSC_VER) && (_MSC_VER == 1201)
    #define __EVC4__
#endif

#if defined(__POCKETPC__) || defined(__SMARTPHONE__) || defined(__WXGPE__)
#   define __WXHANDHELD__
#endif

/*
   Include wx/setup.h for the Unix platform defines generated by configure and
   the library compilation options

   Note that it must be included before defining hardware symbols below as they
   could be already defined by configure
 */
#include "wx/setup.h"

#ifdef __GCCXML__
    /*
        we're using gccxml to create an XML representation of the entire
        wxWidgets interface; use a special setup_gccxml.h file to fix some
        of the stuff #defined by the real setup.h
    */
    #include "wx/setup_gccxml.h"
#endif

/*
   Convenience for any optional classes that use the wxAnyButton base class.
 */
#if wxUSE_TOGGLEBTN || wxUSE_BUTTON
    #define wxHAS_ANY_BUTTON
#endif


/*
   Hardware platform detection.

   VC++ defines _M_xxx symbols.
 */
#if defined(_M_IX86) || defined(i386) || defined(__i386) || defined(__i386__)
    #ifndef __INTEL__
        #define __INTEL__
    #endif
#endif /* x86 */

#if defined(_M_IA64)
    #ifndef __IA64__
        #define __IA64__
    #endif
#endif /* ia64 */

#if defined(_M_MPPC) || defined(__PPC__) || defined(__ppc__)
    #ifndef __POWERPC__
        #define __POWERPC__
    #endif
#endif /* alpha */

#if defined(_M_ALPHA) || defined(__AXP__)
    #ifndef __ALPHA__
        #define __ALPHA__
    #endif
#endif /* alpha */


/*
   adjust the Unicode setting: wxUSE_UNICODE should be defined as 0 or 1
   and is used by wxWidgets, _UNICODE and/or UNICODE may be defined or used by
   the system headers so bring these settings in sync
 */

/* set wxUSE_UNICODE to 1 if UNICODE or _UNICODE is defined */
#if defined(_UNICODE) || defined(UNICODE)
#   undef wxUSE_UNICODE
#   define wxUSE_UNICODE 1
#else /* !UNICODE */
#   ifndef wxUSE_UNICODE
#       define wxUSE_UNICODE 0
#   endif
#endif /* UNICODE/!UNICODE */

/* and vice versa: define UNICODE and _UNICODE if wxUSE_UNICODE is 1 */
#if wxUSE_UNICODE
#   ifndef _UNICODE
#       define _UNICODE
#   endif
#   ifndef UNICODE
#       define UNICODE
#   endif
#endif /* wxUSE_UNICODE */

#if defined( __MWERKS__ ) && !defined(__INTEL__)
/* otherwise MSL headers bring in WIN32 dependant APIs */
#undef UNICODE
#endif


/*
   test for old versions of Borland C, normally need at least 5.82, Turbo
   explorer, available for free at http://www.turboexplorer.com/downloads
*/


/*
    Older versions of Borland C have some compiler bugs that need
    workarounds. Mostly pertains to the free command line compiler 5.5.1.
*/
#if defined(__BORLANDC__) && (__BORLANDC__ <= 0x551)
    /*
        The Borland free compiler is unable to handle overloaded enum
        comparisons under certain conditions e.g. when any class has a
        conversion ctor for an integral type and there's an overload to
        compare between an integral type and that class type.
    */
#   define wxCOMPILER_NO_OVERLOAD_ON_ENUM

    /*
        This is needed to overcome bugs in 5.5.1 STL, linking errors will
        result if it is not defined.
     */
#   define _RWSTD_COMPILE_INSTANTIATE

    /*
        Preprocessor in older Borland compilers have major problems
        concatenating with ##. Specifically, if the string operands being
        concatenated have special meaning (e.g. L"str", 123i64 etc)
        then ## will not concatenate the operands correctly.

        As a workaround, define wxPREPEND* and wxAPPEND* without using
        wxCONCAT_HELPER.
    */
#   define wxCOMPILER_BROKEN_CONCAT_OPER
#endif /* __BORLANDC__ */

/*
   Define Watcom-specific macros.
*/
#ifndef __WATCOMC__
#   define wxWATCOM_VERSION(major,minor) 0
#   define wxCHECK_WATCOM_VERSION(major,minor) 0
#   define wxONLY_WATCOM_EARLIER_THAN(major,minor) 0
#   define WX_WATCOM_ONLY_CODE( x )
#else
#   if __WATCOMC__ < 1200
#       error "Only Open Watcom is supported in this release"
#   endif

#   define wxWATCOM_VERSION(major,minor) ( major * 100 + minor * 10 + 1100 )
#   define wxCHECK_WATCOM_VERSION(major,minor) ( __WATCOMC__ >= wxWATCOM_VERSION(major,minor) )
#   define wxONLY_WATCOM_EARLIER_THAN(major,minor) ( __WATCOMC__ < wxWATCOM_VERSION(major,minor) )
#   define WX_WATCOM_ONLY_CODE( x )  x
#endif

/*
   OS: first of all, test for MS-DOS platform. We must do this before testing
       for Unix, because DJGPP compiler defines __unix__ under MS-DOS
 */
#if defined(__GO32__) || defined(__DJGPP__) || defined(__DOS__)
#    ifndef __DOS__
#        define __DOS__
#    endif
    /* size_t is the same as unsigned int for Watcom 11 compiler, */
    /* so define it if it hadn't been done by configure yet */
#    if !defined(wxSIZE_T_IS_UINT) && !defined(wxSIZE_T_IS_ULONG)
#        ifdef __WATCOMC__
#            define wxSIZE_T_IS_UINT
#        endif
#        ifdef __DJGPP__
#            define wxSIZE_T_IS_ULONG
#        endif
#    endif

/*
   OS: then test for generic Unix defines, then for particular flavours and
       finally for Unix-like systems
       Mac OS X matches this case (__MACH__), prior Mac OS do not.
 */
#elif defined(__UNIX__) || defined(__unix) || defined(__unix__) || \
      defined(____SVR4____) || defined(__LINUX__) || defined(__sgi) || \
      defined(__hpux) || defined(sun) || defined(__SUN__) || defined(_AIX) || \
      defined(__EMX__) || defined(__VMS) || defined(__BEOS__) || defined(__MACH__)

#    define __UNIX_LIKE__

    /* Helps SGI compilation, apparently */
#    ifdef __SGI__
#        ifdef __GNUG__
#            define __need_wchar_t
#        else /* !gcc */
            /*
               Note I use the term __SGI_CC__ for both cc and CC, its not a good
               idea to mix gcc and cc/CC, the name mangling is different
             */
#            define __SGI_CC__
#        endif /* gcc/!gcc */

        /* system headers use this symbol and not __cplusplus in some places */
#       ifndef _LANGUAGE_C_PLUS_PLUS
#           define _LANGUAGE_C_PLUS_PLUS
#       endif
#    endif  /* SGI */

#    if defined(__SUNPRO_CC)
#       ifndef __SUNCC__
#           define __SUNCC__ __SUNPRO_CC
#       endif /* Sun CC */
#    endif /* Sun CC */

#    ifdef __EMX__
#        define OS2EMX_PLAIN_CHAR
#    endif
#    if defined(__INNOTEK_LIBC__)
        /* Ensure visibility of strnlen declaration */
#        define _GNU_SOURCE
#    endif

    /* define __HPUX__ for HP-UX where standard macro is __hpux */
#    if defined(__hpux) && !defined(__HPUX__)
#        define __HPUX__
#    endif /* HP-UX */

#    if defined(__CYGWIN__) || defined(__WINE__)
#        if !defined(wxSIZE_T_IS_UINT)
#            define wxSIZE_T_IS_UINT
#        endif
#    endif

    /*  All of these should already be defined by including configure-
        generated setup.h but we wish to support Xcode compilation without
        requiring the user to define these himself.
     */
#    if defined(__APPLE__) && defined(__MACH__)
#        ifndef __UNIX__
#            define __UNIX__ 1
#        endif
#        ifndef __BSD__
#            define __BSD__ 1
#        endif
        /*  __DARWIN__ is our own define to mean OS X or pure Darwin */
#        ifndef __DARWIN__
#            define __DARWIN__ 1
#        endif
        /*  NOTE: TARGET_CARBON is actually a 0/1 and must be 1 for OS X */
#        ifndef TARGET_CARBON
#            define TARGET_CARBON 1
#        endif
        /* OS X uses unsigned long size_t for both ILP32 and LP64 modes. */
#        if !defined(wxSIZE_T_IS_UINT) && !defined(wxSIZE_T_IS_ULONG)
#            define wxSIZE_T_IS_ULONG
#        endif
#    endif

/*
   OS: Classic Mac OS
 */
#elif defined(applec) || \
      defined(THINK_C) || \
      (defined(__MWERKS__) && !defined(__INTEL__))
      /* MacOS */
#    if !defined(wxSIZE_T_IS_UINT) && !defined(wxSIZE_T_IS_ULONG)
#        define wxSIZE_T_IS_ULONG
#    endif

/*
   OS: OS/2
 */
#elif defined(__OS2__)

    /* wxOS2 vs. non wxOS2 ports on OS2 platform */
#    if !defined(__WXMOTIF__) && !defined(__WXGTK__) && !defined(__WXX11__)
#        ifndef __WXPM__
#            define __WXPM__
#        endif
#    endif

#    if defined(__IBMCPP__)
#        define __VISAGEAVER__ __IBMCPP__
#    endif

    /* Place other OS/2 compiler environment defines here */
#    if defined(__VISAGECPP__)
        /* VisualAge is the only thing that understands _Optlink */
#        define LINKAGEMODE _Optlink
#    endif
#    define wxSIZE_T_IS_UINT

/*
   OS: Otherwise it must be Windows
 */
#else   /* Windows */
#    ifndef __WINDOWS__
#        define __WINDOWS__
#    endif  /* Windows */

    /* to be changed for Win64! */
#    ifndef __WIN32__
#        error "__WIN32__ should be defined for Win32 and Win64, Win16 is not supported"
#    endif

    /*
       define another standard symbol for Microsoft Visual C++: the standard
       one (_MSC_VER) is also defined by Metrowerks compiler
     */
#    if defined(_MSC_VER) && !defined(__MWERKS__)
#        define __VISUALC__ _MSC_VER

    /*
       define special symbols for different VC version instead of writing tests
       for magic numbers such as 1200, 1300 &c repeatedly
     */
#   if __VISUALC__ < 1100
#       error "This Visual C++ version is too old and not supported any longer."
#   elif __VISUALC__ < 1200
#       define __VISUALC5__
#   elif __VISUALC__ < 1300
#       define __VISUALC6__
#   elif __VISUALC__ < 1400
#       define __VISUALC7__
#   elif __VISUALC__ < 1500
#       define __VISUALC8__
#   elif __VISUALC__ < 1600
#       define __VISUALC9__
#   elif __VISUALC__ < 1700
#       define __VISUALC10__
#   else
#       pragma message("Please update wx/platform.h to recognize this VC++ version")
#   endif

#    elif defined(__BCPLUSPLUS__) && !defined(__BORLANDC__)
#        define __BORLANDC__
#    elif defined(__WATCOMC__)
#    elif defined(__SC__)
#        define __SYMANTECC__
#    endif  /* compiler */

    /* size_t is the same as unsigned int for all Windows compilers we know, */
    /* so define it if it hadn't been done by configure yet */
#    if !defined(wxSIZE_T_IS_UINT) && !defined(wxSIZE_T_IS_ULONG) && !defined(__WIN64__)
#        define wxSIZE_T_IS_UINT
#    endif
#endif  /* OS */

/*
   if we're on a Unix system but didn't use configure (so that setup.h didn't
   define __UNIX__), do define __UNIX__ now
 */
#if !defined(__UNIX__) && defined(__UNIX_LIKE__)
#    define __UNIX__
#endif /* Unix */

#if defined(__WXMOTIF__) || defined(__WXX11__)
#    define __X__
#endif

#ifdef __SC__
#    ifdef __DMC__
#         define __DIGITALMARS__
#    else
#         define __SYMANTEC__
#    endif
#endif

#ifdef __INTEL_COMPILER
#   define __INTELC__
#endif

/*
   We get "Large Files (ILP32) not supported in strict ANSI mode." #error
   from HP-UX standard headers when compiling with g++ without this:
 */
#if defined(__HPUX__) && !defined(__STDC_EXT__)
#   define __STDC_EXT__ 1
#endif

/* Force linking against required libraries under Windows: */
#ifdef __WXWINCE__
#   include "wx/msw/wince/libraries.h"
#elif defined __WINDOWS__
#   include "wx/msw/libraries.h"
#endif

/*
   This macro can be used to test the gcc version and can be used like this:

#    if wxCHECK_GCC_VERSION(3, 1)
        ... we have gcc 3.1 or later ...
#    else
        ... no gcc at all or gcc < 3.1 ...
#    endif
*/
#if defined(__GNUC__) && defined(__GNUC_MINOR__)
    #define wxCHECK_GCC_VERSION( major, minor ) \
        ( ( __GNUC__ > (major) ) \
            || ( __GNUC__ == (major) && __GNUC_MINOR__ >= (minor) ) )
#else
    #define wxCHECK_GCC_VERSION( major, minor ) 0
#endif

#if defined(__BORLANDC__) || (defined(__GNUC__) && __GNUC__ < 3)
#define wxNEEDS_CHARPP
#endif

/*
   This macro can be used to test the Visual C++ version.
*/
#ifndef __VISUALC__
#   define wxVISUALC_VERSION(major) 0
#   define wxCHECK_VISUALC_VERSION(major) 0
#else
#   define wxVISUALC_VERSION(major) ( (6 + major) * 100 )
#   define wxCHECK_VISUALC_VERSION(major) ( __VISUALC__ >= wxVISUALC_VERSION(major) )
#endif

/*
   This macro can be used to check that the version of mingw32 compiler is
   at least maj.min
 */
#if ( defined( __GNUWIN32__ ) || defined( __MINGW32__ ) || \
    ( defined( __CYGWIN__ ) && defined( __WINDOWS__ ) ) || \
      wxCHECK_WATCOM_VERSION(1,0) ) && \
    !defined(__DOS__) && \
    !defined(__WXPM__) && \
    !defined(__WXMOTIF__) && \
    !defined(__WXGTK__) && \
    !defined(__WXX11__)
#    include "wx/msw/gccpriv.h"
#else
#    undef wxCHECK_W32API_VERSION
#    define wxCHECK_W32API_VERSION(maj, min) (0)
#    undef wxCHECK_MINGW32_VERSION
#    define wxCHECK_MINGW32_VERSION(maj, min) (0)
#endif

/**
    This is similar to wxCHECK_GCC_VERSION but for Sun CC compiler.
 */
#ifdef __SUNCC__
    /*
       __SUNCC__ is 0xVRP where V is major version, R release and P patch level
     */
    #define wxCHECK_SUNCC_VERSION(maj, min) (__SUNCC__ >= (((maj)<<8) | ((min)<<4)))
#else
    #define wxCHECK_SUNCC_VERSION(maj, min) (0)
#endif

/*
    Handle Darwin gcc universal compilation.  Don't do this in an Apple-
    specific case since no sane compiler should be defining either
    __BIG_ENDIAN__ or __LITTLE_ENDIAN__ unless it really is generating
    code that will be hosted on a machine with the appropriate endianness.
    If a compiler defines neither, assume the user or configure set
    WORDS_BIGENDIAN appropriately.
 */
#if defined(__BIG_ENDIAN__)
#    undef WORDS_BIGENDIAN
#    define WORDS_BIGENDIAN 1
#elif defined(__LITTLE_ENDIAN__)
#    undef WORDS_BIGENDIAN
#elif defined(__WXMAC__) && !defined(WORDS_BIGENDIAN)
/*  According to Stefan even ancient Mac compilers defined __BIG_ENDIAN__ */
#    warning "Compiling wxMac with probably wrong endianness"
#endif
/* also the 32/64 bit universal builds must be handled accordingly */
#ifdef __DARWIN__
#    ifdef __LP64__
#        undef SIZEOF_VOID_P
#        undef SIZEOF_LONG
#        undef SIZEOF_SIZE_T
#        define SIZEOF_VOID_P 8
#        define SIZEOF_LONG 8
#        define SIZEOF_SIZE_T 8
#    else
#        undef SIZEOF_VOID_P
#        undef SIZEOF_LONG
#        undef SIZEOF_SIZE_T
#        define SIZEOF_VOID_P 4
#        define SIZEOF_LONG 4
#        define SIZEOF_SIZE_T 4
#    endif
#endif

/*
    Define various OS X symbols before including wx/chkconf.h which uses them.

    __WXOSX_MAC__ means Mac OS X, non embedded
    __WXOSX_IPHONE__ means OS X iPhone
 */

/*
    Normally all of __WXOSX_XXX__, __WXOSX__ and __WXMAC__ are defined by
    configure but ensure that we also define them if configure was not used for
    whatever reason.

    The primary symbol remains __WXOSX_XXX__ one, __WXOSX__ exists to allow
    checking for any OS X port (Carbon and Cocoa) and __WXMAC__ is an old name
    for it.
 */
#if defined(__WXOSX_CARBON__) || defined(__WXOSX_COCOA__) || defined(__WXOSX_IPHONE__) \
        || (defined(__DARWIN__) && !wxUSE_GUI)
#   ifndef __WXOSX__
#       define __WXOSX__ 1
#   endif
#   ifndef __WXMAC__
#       define __WXMAC__ 1
#   endif
#endif

#ifdef __WXOSX__
/* setup precise defines according to sdk used */
#   include <TargetConditionals.h>
#   if defined(__WXOSX_IPHONE__)
#       if !( defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE )
#           error "incorrect SDK for an iPhone build"
#       endif
#   else
#       if wxUSE_GUI && !(defined(__WXOSX_CARBON__) || defined(__WXOSX_COCOA__))
#           error "one of __WXOSX_IPHONE__, __WXOSX_CARBON__ or __WXOSX_COCOA__ must be defined for the GUI build"
#       endif
#       if !( defined(TARGET_OS_MAC) && TARGET_OS_MAC )
#           error "incorrect SDK for a Mac OS X build"
#       endif
#       define __WXOSX_MAC__ 1
#   endif
#endif

#ifdef __WXOSX_MAC__
#    if defined(__MACH__)
#        include <AvailabilityMacros.h>
#        ifndef MAC_OS_X_VERSION_10_4
#           define MAC_OS_X_VERSION_10_4 1040
#        endif
#        ifndef MAC_OS_X_VERSION_10_5
#           define MAC_OS_X_VERSION_10_5 1050
#        endif
#        ifndef MAC_OS_X_VERSION_10_6
#           define MAC_OS_X_VERSION_10_6 1060
#        endif
#    else
#        error "only mach-o configurations are supported"
#    endif
#endif

/*
    __WXOSX_OR_COCOA__ is a common define to wxOSX (Carbon or Cocoa) and wxCocoa ports under OS X.

    DO NOT use this define in base library code.  Although wxMac has its own
    private base library (and thus __WXOSX_OR_COCOA__,__WXMAC__ and related defines are
    valid there), wxCocoa shares its library with other ports like wxGTK and wxX11.

    To keep wx authors from screwing this up, only enable __WXOSX_OR_COCOA__ for wxCocoa when
    not compiling the base library.  We determine this by first checking if
    wxUSE_BASE is not defined.  If it is not defined, then we're not buildling
    the base library, and possibly not building wx at all (but actually building
    user code that's using wx). If it is defined then we must check to make sure
    it is not true.  If it is true, we're building base.

    If you want it in the common darwin base library then use __DARWIN__.  You
    can use any Darwin-available libraries like CoreFoundation but please avoid
    using OS X libraries like Carbon or CoreServices.

 */
#if defined(__WXOSX__) || (defined(__WXCOCOA__) && (!defined(wxUSE_BASE) || !wxUSE_BASE))
#   define __WXOSX_OR_COCOA__ 1
#endif

/*
   check the consistency of the settings in setup.h: note that this must be
   done after setting wxUSE_UNICODE correctly as it is used in wx/chkconf.h
   and after defining the compiler macros which are used in it too
 */
#include "wx/chkconf.h"


/*
   some compilers don't support iostream.h any longer, while some of theme
   are not updated with <iostream> yet, so override the users setting here
   in such case.
 */
#if defined(_MSC_VER) && (_MSC_VER >= 1310)
#    undef wxUSE_IOSTREAMH
#    define wxUSE_IOSTREAMH 0
#elif defined(__DMC__) || defined(__WATCOMC__)
#    undef wxUSE_IOSTREAMH
#    define wxUSE_IOSTREAMH 1
#elif defined(__MINGW32__)
#    undef wxUSE_IOSTREAMH
#    define wxUSE_IOSTREAMH 0
#endif /* compilers with/without iostream.h */

/*
   old C++ headers (like <iostream.h>) declare classes in the global namespace
   while the new, standard ones (like <iostream>) do it in std:: namespace,
   unless it's an old gcc version.

   using this macro allows constuctions like "wxSTD iostream" to work in
   either case
 */
#if !wxUSE_IOSTREAMH && (!defined(__GNUC__) || ( __GNUC__ > 2 ) || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95))
#    define wxSTD std::
#else
#    define wxSTD
#endif

/* On OpenVMS with the most recent HP C++ compiler some function (i.e. wscanf)
 * are only available in the std-namespace. (BUG???)
 */
#if defined(  __VMS ) && (__DECCXX_VER >= 70100000) && !defined(__STD_CFRONT) && !defined( __NONAMESPACE_STD )
# define wxVMS_USE_STD std::
#else
# define wxVMS_USE_STD
#endif

#ifdef __VMS
#define XtDisplay XTDISPLAY
#ifdef __WXMOTIF__
#define XtParent XTPARENT
#define XtScreen XTSCREEN
#define XtWindow XTWINDOW
#endif
#endif

/* Choose which method we will use for updating menus
 * - in OnIdle, or when we receive a wxEVT_MENU_OPEN event.
 * Presently, only Windows and GTK+ support wxEVT_MENU_OPEN.
 */
#ifndef wxUSE_IDLEMENUUPDATES
#    if (defined(__WXMSW__) || defined(__WXGTK__)) && !defined(__WXUNIVERSAL__)
#        define wxUSE_IDLEMENUUPDATES 0
#    else
#        define wxUSE_IDLEMENUUPDATES 1
#    endif
#endif

/*
 * Define symbols that are not yet in
 * configure or possibly some setup.h files.
 * They will need to be added.
 */

#ifndef wxUSE_FILECONFIG
#    if wxUSE_CONFIG && wxUSE_TEXTFILE
#        define wxUSE_FILECONFIG 1
#    else
#        define wxUSE_FILECONFIG 0
#    endif
#endif

#ifndef wxUSE_HOTKEY
#    define wxUSE_HOTKEY 0
#endif

#if !defined(wxUSE_WXDIB) && defined(__WXMSW__)
#    define wxUSE_WXDIB 1
#endif

/*
    Optionally supported C++ features.
 */

/*
    RTTI: if it is disabled in build/msw/makefile.* then this symbol will
    already be defined but it's also possible to do it from configure (with
    g++) or by editing project files with MSVC so test for it here too.
 */
#ifndef wxNO_RTTI
    /*
        Only 4.3 defines __GXX_RTTI by default so its absence is not an
        indication of disabled RTTI with the previous versions.
     */
#   if wxCHECK_GCC_VERSION(4, 3)
#       ifndef __GXX_RTTI
#           define wxNO_RTTI
#       endif
#   elif defined(_MSC_VER)
#       ifndef _CPPRTTI
#           define wxNO_RTTI
#       endif
#   endif
#endif /* wxNO_RTTI */

#endif /* _WX_PLATFORM_H_ */