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Preprocessor Symbols

These are preprocessor symbols used in the wxWidgets source, grouped by category (and sorted by alphabetical order inside each category).

All of these macros except for the `wxUSE_XXX` variety is defined if the corresponding condition is true and undefined if it isn't, so they should be always tested using #ifdef and not #if.

# GUI system

__WXBASE__ | Only wxBase, no GUI features (same as `wxUSE_GUI` == 0)
__WXCOCOA__ | OS X using wxCocoa Port
__WXDFB__ | wxUniversal using DirectFB
__WXWINCE__ | Windows CE
__WXGTK__ | GTK+
__WXGTK12__ | GTK+ 1.2 or higher
__WXGTK20__ | GTK+ 2.0 or higher
__WXGTK24__ | GTK+ 2.4 or higher
__WXGTK26__ | GTK+ 2.6 or higher
__WXGTK210__ | GTK+ 2.10 or higher
__WXMAC__ | old define, same as `WXOSX`
__WXMOTIF__ | Motif
__WXMOTIF20__ | Motif 2.0 or higher
__WXMSW__ | GUI using Windows Controls. Notice that for compatibility reasons, this symbol is defined for console applications under Windows as well, but it should only be used in the GUI code while `WINDOWS` should be used for the platform tests.
__WXOSX__ | OS X GUI using any Apple widget framework (Carbon, AppKit or UIKit)
__WXOSX_IPHONE__ | OS X iPhone (UIKit)
__WXOSX_CARBON__ | Mac OS X using Carbon
__WXOSX_COCOA__ | Mac OS X using Cocoa (AppKit)
__WXOSX_MAC__ | Mac OS X (Carbon or Cocoa)
__WXOSX_OR_COCOA__ | Any Mac OS X port (wxOSX-Carbon, wxOSX-Cocoa or wxCocoa)
__WXPM__ | OS/2 native Presentation Manager
__WXSTUBS__ | Stubbed version ('template' wxWin implementation)
__WXXT__ | Xt; mutually exclusive with WX_MOTIF, not implemented in wxWidgets 2.x
__WXX11__ | wxX11 (WXUNIVERSAL will be also defined)
__WXWINE__ | WINE (i.e. WIN32 on Unix)
__WXUNIVERSAL__ | wxUniversal port, always defined in addition to one of the symbols above so this should be tested first.
__X__ | any X11-based GUI toolkit except GTK+

There are two wxWidgets ports to Mac OS X. One of them, wxOSX is the successor of the venerable wxMac, it currently exists in three versions: Carbon and Cocoa for the desktop and a very early iPhone port. And there is the Cocoa port named wxCocoa which has not been updated very actively since beginning 2008. To summarize:

- If you want to test for wxOSX on the desktop, use `WXOSX_MAC`.
- If you want to test for wxOSX on the iPhone, use `WXOSX_IPHONE`.
- If you want to test for any GUI Mac port under OS X, use `WXOSX_OR_COCOA`.
- If you want to test for any port under Mac OS X, including, for example, wxGTK and also wxBase, use `DARWIN` (see below).

The convention is to use the `__WX` prefix for these symbols, although this has not always been followed.

# Operating Systems

__APPLE__ | any Mac OS version
__AIX__ | AIX
__BSD__ | Any *BSD system
__CYGWIN__ | Cygwin: Unix on Win32
__DARWIN__ | Mac OS X (with BSD C library), using any port (see also `WXOSX`)
__DATA_GENERAL__ | DG-UX
__FREEBSD__ | FreeBSD
__HPUX__ | HP-UX (Unix)
__GNU__ | GNU Hurd
__LINUX__ | Linux
__MACH__ | Mach-O Architecture (Mac OS X only builds)
__OSF__ | OSF/1
__QNX__ | QNX Neutrino RTOS
__SGI__ | IRIX
__SOLARIS__ | Solaris
__SUN__ | Any Sun
__SUNOS__ | Sun OS
__SVR4__ | SystemV R4
__SYSV__ | SystemV generic
__ULTRIX__ | Ultrix
__UNIX__ | any Unix
__UNIX_LIKE__ | Unix, BeOS or VMS
__VMS__ | VMS
__WINDOWS__ | Any Windows platform, using any port (see also `WXMSW`)
__WIN16__ | Win16 API (not supported since wxWidgets 2.6)
__WIN32__ | Win32 API
__WIN64__ | Win64 (mostly same as Win32 but data type sizes are different)
__WINE__ | Wine
_WIN32_WCE | Windows CE version

# Hardware Architectures (CPU)

Note that not all of these symbols are always defined, it depends on the compiler used.

__ALPHA__ | DEC Alpha architecture
__INTEL__ | Intel i386 or compatible
__IA64__ | Intel 64 bit architecture
__POWERPC__ | Motorola Power PC

# Hardware Type

__SMARTPHONE__ | Generic mobile devices with phone buttons and a small display
__PDA__ | Personal digital assistant, usually with touch screen
__HANDHELD__ | Small but powerful computer, usually with a keyboard
__POCKETPC__ | Microsoft-powered PocketPC devices with touch-screen
__WINCE_STANDARDSDK__ | Microsoft-powered Windows CE devices, for generic Windows CE applications
__WINCE_NET__ | Microsoft-powered Windows CE .NET devices (_WIN32_WCE is 400 or greater)
WIN32_PLATFORM_WFSP | Microsoft-powered smartphone

# Compilers

__BORLANDC__ | Borland C++. The value of the macro corresponds to the compiler version: 500 is 5.0.
__DJGPP__ | DJGPP
__DIGITALMARS__ | Digital Mars
__EVC4__ | Embedded Visual C++ 4 (can be only used for building wxWinCE)
__GNUG__ | Gnu C++ on any platform, see also wxCHECK_GCC_VERSION
__GNUWIN32__ | Gnu-Win32 compiler, see also wxCHECK_W32API_VERSION
__INTELC__ | Intel C++ compiler
__MINGW32__ | Either MinGW32 or MinGW-w64 in either 32 or 64 bits
__MINGW32_TOOLCHAIN | MinGW32 only (32 bits only right now)
__MINGW64__ | MinGW-w64 in 64 bit builds
__MINGW64_TOOLCHAIN__ | MinGW-w64 in either 32 or 64 bit builds
__SUNCC__ | Sun CC, see also wxCHECK_SUNCC_VERSION
__SYMANTECC__ | Symantec C++
__VISAGECPP__ | IBM Visual Age (OS/2)
__VISUALC__ | Microsoft Visual C++, see also wxCHECK_VISUALC_VERSION. The value of this macro corresponds to the compiler version: `1020` for `4.2` (the first supported version), `1100` for `5.0`, `1200` for `6.0` and so on. For convenience, the symbols VISUALCn are also defined for each major compiler version from 5 to 12, i.e. you can use tests such #ifdef VISUALC7 to test for compiler version being precisely 7.
__XLC__ | AIX compiler
__WATCOMC__ | Watcom C++. The value of this macro corresponds to the compiler version, `1100` is `11.0` and `1200` is OpenWatcom.

# Feature Tests

Some library features may not be always available even if they were selected by the user. To make it possible to check if this is the case, the library predefines the symbols in the form `wxHAS_FEATURE`. Unlike `wxUSE_FEATURE` symbols which are defined by the library user (directly in `setup.h` or by running configure script) and which must be always defined as either 0 or 1, the `wxHAS` symbols are only defined if the corresponding feature is available and not defined at all otherwise.

Currently the following symbols exist:

wxHAS_3STATE_CHECKBOX | Defined if wxCheckBox supports wxCHK_3STATE flag, i.e. is capable of showing three states and not only the usual two. Currently defined for almost all ports.
wxHAS_ATOMIC_OPS | Defined if wxAtomicInc() and wxAtomicDec() functions have an efficient (CPU-specific) implementation. Notice that the functions themselves are always available but can be prohibitively slow to use when implemented in a generic way, using a critical section.
wxHAS_BITMAPTOGGLEBUTTON | Defined in `wx/tglbtn.h` if wxBitmapToggleButton class is available in addition to wxToggleButton.
wxHAS_CONFIG_TEMPLATE_RW | Defined if the currently used compiler supports template Read() and Write() methods in wxConfig.
wxHAS_LARGE_FILES | Defined if wxFile supports files more than 4GB in size (notice that you must include `wx/filefn.h` before testing for this symbol).
wxHAS_LARGE_FFILES | Defined if wxFFile supports files more than 4GB in size (notice that you must include `wx/filefn.h` before testing for this symbol).
wxHAS_LONG_LONG_T_DIFFERENT_FROM_LONG | Defined if compiler supports a 64 bit integer type (available as `wxLongLong_t`) and this type is different from long. Notice that, provided wxUSE_LONGLONG is not turned off, some 64 bit type is always available to wxWidgets programs and this symbol only indicates a presence of such primitive type. It is useful to decide whether some function should be overloaded for both `long` and `long long` types.
wxHAS_MULTIPLE_FILEDLG_FILTERS | Defined if wxFileDialog supports multiple ('|'-separated) filters.
wxHAS_IMAGES_IN_RESOURCES | Defined if Windows resource files or OS/2 resource files are available on the current platform.
wxHAS_POWER_EVENTS | Defined if wxPowerEvent are ever generated on the current platform.
wxHAS_RADIO_MENU_ITEMS | Defined if the current port supports radio menu items (see wxMenu::AppendRadioItem).
wxHAS_RAW_BITMAP | Defined if direct access to bitmap data using the classes in `wx/rawbmp.h` is supported.
wxHAS_RAW_KEY_CODES | Defined if raw key codes (see wxKeyEvent::GetRawKeyCode are supported.
wxHAS_REGEX_ADVANCED | Defined if advanced syntax is available in wxRegEx.
wxHAS_TASK_BAR_ICON | Defined if wxTaskBarIcon is available on the current platform.

# Library Selection for MSVC

Microsoft Visual C++ users may use the special `wx/setup.h` file for this compiler in `include/msvc` subdirectory. This file implicitly links in all the wxWidgets libraries using MSVC-specific pragmas which usually is much more convenient than manually specifying the libraries list in all of the project configurations. However sometimes linking with all the libraries is not desirable, for example because some of them were not built and this is where the symbols in this section can be helpful: defining them allows to not link with the corresponding library. The following symbols are honoured:

    - wxNO_ADV_LIB
    - wxNO_AUI_LIB
    - wxNO_HTML_LIB
    - wxNO_MEDIA_LIB
    - wxNO_NET_LIB
    - wxNO_PROPGRID_LIB
    - wxNO_QA_LIB
    - wxNO_RICHTEXT_LIB
    - wxNO_WEBVIEW_LIB
    - wxNO_XML_LIB
    - wxNO_REGEX_LIB
    - wxNO_EXPAT_LIB
    - wxNO_JPEG_LIB
    - wxNO_PNG_LIB
    - wxNO_TIFF_LIB
    - wxNO_ZLIB_LIB

Notice that the base library is always included and the core is always included for the GUI applications (i.e. those which don't define `wxUSE_GUI` as 0).

If the makefiles have been used to build the libraries from source and the `CFG` variable has been set to specify a different output path for that particular configuration of build then the `wxCFG` preprocessor symbol should be set in the project that uses wxWidgets to the same value as the `CFG` variable in order for the correct `wx/setup.h` file to automatically be included for that configuration.

# Miscellaneous

__WXWINDOWS__ | always defined in wxWidgets applications, see also wxCHECK_VERSION
wxDEBUG_LEVEL | defined as 1 by default, may be pre-defined as 0 before including wxWidgets headers to disable generation of any code at all for the assertion macros, see Debugging
__WXDEBUG__ | defined if wxDEBUG_LEVEL is 1 or more, undefined otherwise
wxUSE_XXX | if defined as 1, feature XXX is active, see the wxUSE Preprocessor Symbols (the symbols of this form are always defined, use #if and not #ifdef to test for them)
WX_PRECOMP | is defined if precompiled headers (PCH) are in use. In this case, `wx/wxprec.h` includes `wx/wx.h` which, in turn, includes a number of wxWidgets headers thus making it unnecessary to include them explicitly. However if this is not defined, you do need to include them and so the usual idiom which allows to support both cases is to first include `wx/wxprec.h` and then, inside #ifndef WX_PRECOMP, individual headers you need.}
_UNICODE and UNICODE | both are defined if wxUSE_UNICODE is set to `1`
wxUSE_GUI | this particular feature test macro is defined to 1 when compiling or using the library with the GUI features activated, if it is defined as `0`, only wxBase is available.
wxUSE_BASE | only used by wxWidgets internally (defined as 1 when building wxBase code, either as a standalone library or as part of the monolithic wxWidgets library, defined as 0 when building GUI library only)
wxNO_RTTI | is defined if the compiler RTTI support has been switched off
wxNO_EXCEPTIONS | is defined if the compiler support for C++ exceptions has been switched off
wxNO_THREADS | if this macro is defined, the compilation options don't include compiler flags needed for multithreaded code generation. This implies that wxUSE_THREADS is 0 and also that other (non-wx-based) threading packages cannot be used neither.
WXMAKINGDLL_XXX | used internally and defined when building the library `XXX` as a DLL; when a monolithic wxWidgets build is used only a single `WXMAKINGDLL` symbol is defined
WXUSINGDLL | defined when compiling code which uses wxWidgets as a DLL/shared library
WXBUILDING | defined when building wxWidgets itself, whether as a static or shared library