\section{Preprocesser symbols defined by wxWidgets}\label{cppconst}
-Here is the list of preprocessor symbols used in the wxWidgets source grouped
+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 \texttt{wxUSE\_XXX} variety is defined if the
+these macros except for the \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}.
-
+always tested using \texttt{#ifdef} and not \texttt{#if}.
\subsection{GUI system}\label{guisystemconst}
\twocolitem{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)}
+\twocolitem{\_UNICODE and UNICODE}{both are defined if wxUSE\_UNICODE is set to $1$}
\twocolitem{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.}
\twocolitem{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)}
+\twocolitem{wxNO\_RTTI}{is defined if the compiler RTTI support has been switched off}
+\twocolitem{wxNO\_EXCEPTIONS}{is defined if the compiler support for C++
+exceptions has been switched off}
+\twocolitem{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.}
\end{twocollist}