define __WXOSX__ for wxMac/Cocoa; document it

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29994 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/cppconst.tex

@@ -1,7 +1,11 @@
 \section{Preprocesser symbols defined by wxWidgets}\label{cppconst}
 
 Here is the list of preprocessor symbols used in the wxWidgets source grouped
-by category (and sorted by alphabetical order inside each category).
+by category (and sorted by alphabetical order inside each category). All of
+these macros except for \texttt{wxUSE\_XXX} variety is defined if the
+corresponding condition is true and undefined if it isn't, so they should be
+always tested usin \texttt{#ifdef} and not \texttt{#if}.
+
 
 \subsection{GUI system}\label{guisystemconst}
 
@@ -10,7 +14,8 @@ by category (and sorted by alphabetical order inside each category).
 \twocolitem{\_\_WIN16\_\_}{Win16 API (not supported since wxWidgets 2.6)}
 \twocolitem{\_\_WIN32\_\_}{Win32 API}
 \twocolitem{\_\_WIN95\_\_}{Windows 95 or NT 4.0 and above system (not NT 3.5x)}
-\twocolitem{\_\_WXBASE\_\_}{Only wxBase, no GUI features}
+\twocolitem{\_\_WXBASE\_\_}{Only wxBase, no GUI features (same as \texttt{wxUSE\_GUI} $== 0$)}
+\twocolitem{\_\_WXCOCOA\_\_}{OS X using Cocoa API}
 \twocolitem{\_\_WXWINCE\_\_}{Windows CE}
 \twocolitem{\_\_WXGTK\_\_}{GTK+}
 \twocolitem{\_\_WXGTK12\_\_}{GTK+ 1.2 or higher}
@@ -20,11 +25,12 @@ by category (and sorted by alphabetical order inside each category).
 \twocolitem{\_\_WXMAC\_\_}{Mac OS all targets}
 \twocolitem{\_\_WXMAC\_CLASSIC\_\_}{MacOS for Classic}
 \twocolitem{\_\_WXMAC\_CARBON\_\_}{MacOS for Carbon CFM (running under Classic or OSX) or true OS X Mach-O Builds}
-\twocolitem{\_\_WXMAC\_OSX\_\_}{MacOS X Mach-O Builds}
+\twocolitem{\_\_WXMAC\_OSX\_\_}{MacOS X Carbon Mach-O Builds}
 \twocolitem{\_\_WXMGL\_\_}{SciTech Soft MGL (\_\_WXUNIVERSAL\_\_ will be also
 defined)}
 \twocolitem{\_\_WXMSW\_\_}{Any Windows}
 \twocolitem{\_\_WXOS2\_\_}{Identical to \_\_WXPM\_\_}
+\twocolitem{\_\_WXOSX\_\_}{Any Mac OS X port (either Carbon or Cocoa)}
 \twocolitem{\_\_WXPM\_\_}{OS/2 native Presentation Manager}
 \twocolitem{\_\_WXSTUBS\_\_}{Stubbed version ('template' wxWin implementation)}
 \twocolitem{\_\_WXXT\_\_}{Xt; mutually exclusive with WX\_MOTIF, not
@@ -36,8 +42,27 @@ to one of the symbols above so this should be tested first.}
 \twocolitem{\_\_X\_\_}{any X11-based GUI toolkit except GTK+}
 \end{twocollist}
 
-In fact, they should better all start with \_\_WX instead of \_\_ only,
-so please start any new defines with \_\_WX.
+Mac situation is a bit confusing so a few extra words to explain it: there are
+2 wx ports to Mac OS. One of them, wxMac, exists in 2 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:
+\begin{itemize}
+    \item If you want to test for all Mac platforms, classic and OS X, you
+        should test both \texttt{\_\_WXMAC\_\_} and \texttt{\_\_WXCOCOA\_\_}
+    \item If you want to test for any GUI Mac port under OS X, use
+        \texttt{\_\_WXOSX\_\_}
+    \item If you want to test for any port under Mac OS X, including, for
+        example, wxGTK and also wxBase, use \texttt{\_\_DARWIN\_\_} (see below)
+\end{itemize}
+
+
+Note to implementors: although some of the symbols above don't start with 
+\texttt{\_\_WX} prefix, they really should always use it, so please do start
+any new symbols with it.
+
 
 \subsection{Operating systems}\label{osconst}
 
@@ -68,6 +93,7 @@ so please start any new defines with \_\_WX.
 \twocolitem{\_\_WINDOWS\_\_}{any Windows}
 \end{twocollist}
 
+
 \subsection{Hardware architectures (CPU)}\label{cpuconst}
 
 Note that not all of these symbols are always defined, it depends on the
@@ -79,6 +105,7 @@ compiler used.
 \twocolitem{\_\_POWERPC\_\_}{Motorola Power PC}
 \end{twocollist}
 
+
 \subsection{Hardware type}\label{hardwareconst}
 
 Combination of these symbols with GUI symbols describes real hardware
@@ -92,6 +119,7 @@ middle sized screen}
 \twocolitem{\_\_HANDHELD\_\_}{Small enough but powerful computer}
 \end{twocollist}
 
+
 \subsection{Compilers}\label{compilerconst}
 
 \begin{twocollist}\itemsep=0pt
@@ -117,6 +145,7 @@ the compiler version, $1100$ is $11.0$ and $1200$ is OpenWatcom.}
 \twocolitem{\_WIN32\_WCE}{Windows CE version}
 \end{twocollist}
 
+
 \subsection{Miscellaneous}\label{miscellaneousconst}
 
 \begin{twocollist}\itemsep=0pt

include/wx/platform.h

@@ -30,19 +30,26 @@
     builds, running under 10.2 + only
 */
 #ifdef __WXMAC__
-    #if defined(__MACH__)
-        #define __WXMAC_OSX__ 1
-        #define __WXMAC_CARBON__ 1
-        #ifdef __WXMAC_XCODE__
-            #include "wx/mac/carbon/config_xcode.h"
-        #endif
-    #else
-        #if TARGET_CARBON
-            #define __WXMAC_CARBON__ 1
-        #else
-            #define __WXMAC_CLASSIC__ 1
-        #endif
-    #endif
+#    if defined(__MACH__)
+#        define __WXMAC_OSX__ 1
+#        define __WXMAC_CARBON__ 1
+#        ifdef __WXMAC_XCODE__
+#            include "wx/mac/carbon/config_xcode.h"
+#        endif
+#    else
+#        if TARGET_CARBON
+#            define __WXMAC_CARBON__ 1
+#        else
+#            define __WXMAC_CLASSIC__ 1
+#        endif
+#    endif
+#endif
+
+/*
+    __WXOSX__ is a common define to wxMac (Carbon) and wxCocoa ports under OS X.
+ */
+#if defined(__WXMAC_OSX__) || defined(__WXCOCOA__)
+#   define __WXOSX__
 #endif
 
 /*