CMake: group build options by type

First general build options, then (optional) dependencies, lastly the
examples.

Rewrite WITH_XCB description to clarify that this concerns an example.

There are no functional changes.

Signed-off-by: Johannes Kauffmann <johanneskauffmann@hotmail.com>

Author: Johannes Kauffmann

CMakeLists.txt

@@ -55,28 +55,30 @@ option(LIBVNCSERVER_INSTALL "Generate installation target" ON)
 option(WITH_LIBVNCSERVER "Build libvncserver" ON)
 option(WITH_LIBVNCCLIENT "Build libvncclient" ON)
 option(BUILD_SHARED_LIBS "Build shared libraries" ${UNIX})
+option(WITH_TESTS "Build tests" ON)
+option(WITH_THREADS "Search for a threading library to build with multithreading support" ON)
+option(PREFER_WIN32THREADS "When searching for a threading library, prefer win32 threads if they are found" OFF)
+option(WITH_TIGHTVNC_FILETRANSFER "Enable filetransfer if there is pthreads support" ON)
+option(WITH_24BPP "Allow 24 bpp" ON)
+option(WITH_IPv6 "Enable IPv6 Support" ON)
+option(WITH_WEBSOCKETS "Build with websockets support" ON)
+# (optional) dependencies
 option(WITH_ZLIB "Search for the zlib compression library to support additional encodings" ON)
 option(WITH_LZO "Search for the LZO compression library to omit internal miniLZO implementation" ON)
 option(WITH_JPEG "Search for the libjpeg compression library to support additional encodings" ON)
 option(WITH_PNG "Search for the PNG compression library to support additional encodings" ON)
-option(WITH_SDL "Search for the Simple Direct Media Layer library to build an example SDL vnc client" ON)
-option(WITH_GTK "Search for the GTK library to build an example GTK vnc client" ON)
-option(WITH_LIBSSHTUNNEL "Search for libsshtunnel to build an example ssh-tunneled client" ON)
-option(WITH_THREADS "Search for a threading library to build with multithreading support" ON)
-option(PREFER_WIN32THREADS "When searching for a threading library, prefer win32 threads if they are found" OFF)
 option(WITH_GNUTLS "Search for the GnuTLS secure communications library to support TLS" ON)
 option(WITH_OPENSSL "Search for the OpenSSL cryptography library to support TLS and use as crypto backend" ON)
 option(WITH_SYSTEMD "Search for libsystemd to build with systemd socket activation support" ON)
 option(WITH_GCRYPT "Search for Libgcrypt to use as crypto backend" ON)
-option(WITH_FFMPEG "Search for FFMPEG to build an example VNC to MPEG encoder" ON)
-option(WITH_TIGHTVNC_FILETRANSFER "Enable filetransfer if there is pthreads support" ON)
-option(WITH_24BPP "Allow 24 bpp" ON)
-option(WITH_IPv6 "Enable IPv6 Support" ON)
-option(WITH_WEBSOCKETS "Build with websockets support" ON)
 option(WITH_SASL "Build with SASL support" ON)
-option(WITH_XCB "Build with XCB support" ON)
+# examples
 option(WITH_EXAMPLES "Build examples" ON)
-option(WITH_TESTS "Build tests" ON)
+option(WITH_SDL "Search for the Simple Direct Media Layer library to build an example SDL vnc client" ON)
+option(WITH_GTK "Search for the GTK library to build an example GTK vnc client" ON)
+option(WITH_LIBSSHTUNNEL "Search for libsshtunnel to build an example ssh-tunneled client" ON)
+option(WITH_FFMPEG "Search for FFMPEG to build an example VNC to MPEG encoder" ON)
+option(WITH_XCB "Build XCB server example" ON)
 option(WITH_QT "Build the Qt client example" ON)