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
Operating systems
Hardware architectures (CPU)
Hardware type
Compilers
Feature tests
Miscellaneous
| __WINDOWS__ | any Windows, yom may also use __WXMSW__ |
| __WIN16__ | Win16 API (not supported since wxWidgets 2.6) |
| __WIN32__ | Win32 API |
| __WXBASE__ | Only wxBase, no GUI features (same as wxUSE_GUI == 0) |
| __WXCOCOA__ | OS X using Cocoa API |
| __WXWINCE__ | Windows CE |
| __WXGTK__ | GTK+ |
| __WXGTK12__ | GTK+ 1.2 or higher |
| __WXGTK20__ | GTK+ 2.0 or higher |
| __WXMOTIF__ | Motif |
| __WXMOTIF20__ | Motif 2.0 or higher |
| __WXMAC__ | Mac OS all targets |
| __WXMAC_CLASSIC__ | MacOS for Classic |
| __WXMAC_CARBON__ | MacOS for Carbon CFM (running under Classic or OSX) or true OS X Mach-O Builds |
| __WXMAC_OSX__ | MacOS X Carbon Mach-O Builds |
| __WXMGL__ | SciTech Soft MGL (__WXUNIVERSAL__ will be also defined) |
| __WXMSW__ | Any Windows |
| __WXOSX__ | Any Mac OS X port (either Carbon or Cocoa) |
| __WXPALMOS__ | PalmOS |
| __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. One of them, wxMac, exists in two versions: Classic and Carbon. The Classic version is the only one to work on Mac OS version 8. The Carbon version may be built either as CFM or Mach-O (binary format, like ELF) and the former may run under OS 9 while the latter only runs under OS X. Finally, there is a new Cocoa port which can only be used under OS X. To summarize:
The convention is to use the __WX prefix for these symbols, although this has not always been followed.
| __APPLE__ | any Mac OS version |
| __AIX__ | AIX |
| __BSD__ | Any *BSD system |
| __CYGWIN__ | Cygwin: Unix on Win32 |
| __DARWIN__ | Mac OS X using the BSD Unix C library (as opposed to using the Metrowerks MSL C/C++ library) |
| __DATA_GENERAL__ | DG-UX |
| __DOS_GENERAL__ | DOS (used with wxMGL only) |
| __FREEBSD__ | FreeBSD |
| __HPUX__ | HP-UX (Unix) |
| __GNU__ | GNU Hurd |
| __LINUX__ | Linux |
| __MACH__ | Mach-O Architecture (Mac OS X only builds) |
| __OSF__ | OSF/1 |
| __PALMOS__ | PalmOS |
| __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 |
| __WINE__ | Wine |
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 |
| __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 |
| __BORLANDC__ | Borland C++. The value of the macro corresponds to the compiler version: 500 is 5.0. |
| __DJGPP__ | DJGPP |
| __DIGITALMARS__ | Digital Mars |
| __GNUG__ | Gnu C++ on any platform, see also wxCHECK_GCC_VERSION |
| __GNUWIN32__ | Gnu-Win32 compiler, see also wxCHECK_W32API_VERSION |
| __MINGW32__ | MinGW |
| __MWERKS__ | CodeWarrior MetroWerks compiler |
| __SUNCC__ | Sun CC |
| __SYMANTECC__ | Symantec C++ |
| __VISAGECPP__ | IBM Visual Age (OS/2) |
| __VISUALC__ | Microsoft Visual C++. 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 |
| __XLC__ | AIX compiler |
| __WATCOMC__ | Watcom C++. The value of this macro corresponds to the compiler version, 1100 is 11.0 and 1200 is OpenWatcom. |
| _WIN32_WCE | Windows CE version |
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_LARGE_FILES | Defined if wxFile supports files more than 4GB in size. |
| wxHAS_LARGE_FFILES | Defined if wxFFile supports files more than 4GB in size. |
| 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. |
| wxHAS_RAW_KEY_CODES | Defined if raw key codes 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. |
| __WXWINDOWS__ | always defined in wxWidgets applications, see also wxCHECK_VERSION |
| __WXDEBUG__ | defined in debug mode, undefined in release mode |
| wxUSE_XXX | if defined as 1, feature XXX is active (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. |