+**LLVM_BUILD_DOCS**:BOOL
+ Enables all enabled documentation targets (i.e. Doxgyen and Sphinx targets) to
+ be built as part of the normal build. If the ``install`` target is run then
+ this also enables all built documentation targets to be installed. Defaults to
+ OFF.
+
+**LLVM_ENABLE_DOXYGEN**:BOOL
+ Enables the generation of browsable HTML documentation using doxygen.
+ Defaults to OFF.
+
+**LLVM_ENABLE_DOXYGEN_QT_HELP**:BOOL
+ Enables the generation of a Qt Compressed Help file. Defaults to OFF.
+ This affects the make target ``doxygen-llvm``. When enabled, apart from
+ the normal HTML output generated by doxygen, this will produce a QCH file
+ named ``org.llvm.qch``. You can then load this file into Qt Creator.
+ This option is only useful in combination with ``-DLLVM_ENABLE_DOXYGEN=ON``;
+ otherwise this has no effect.
+
+**LLVM_DOXYGEN_QCH_FILENAME**:STRING
+ The filename of the Qt Compressed Help file that will be generated when
+ ``-DLLVM_ENABLE_DOXYGEN=ON`` and
+ ``-DLLVM_ENABLE_DOXYGEN_QT_HELP=ON`` are given. Defaults to
+ ``org.llvm.qch``.
+ This option is only useful in combination with
+ ``-DLLVM_ENABLE_DOXYGEN_QT_HELP=ON``;
+ otherwise it has no effect.
+
+**LLVM_DOXYGEN_QHP_NAMESPACE**:STRING
+ Namespace under which the intermediate Qt Help Project file lives. See `Qt
+ Help Project`_
+ for more information. Defaults to "org.llvm". This option is only useful in
+ combination with ``-DLLVM_ENABLE_DOXYGEN_QT_HELP=ON``; otherwise
+ it has no effect.
+
+**LLVM_DOXYGEN_QHP_CUST_FILTER_NAME**:STRING
+ See `Qt Help Project`_ for
+ more information. Defaults to the CMake variable ``${PACKAGE_STRING}`` which
+ is a combination of the package name and version string. This filter can then
+ be used in Qt Creator to select only documentation from LLVM when browsing
+ through all the help files that you might have loaded. This option is only
+ useful in combination with ``-DLLVM_ENABLE_DOXYGEN_QT_HELP=ON``;
+ otherwise it has no effect.
+
+.. _Qt Help Project: http://qt-project.org/doc/qt-4.8/qthelpproject.html#custom-filters
+
+**LLVM_DOXYGEN_QHELPGENERATOR_PATH**:STRING
+ The path to the ``qhelpgenerator`` executable. Defaults to whatever CMake's
+ ``find_program()`` can find. This option is only useful in combination with
+ ``-DLLVM_ENABLE_DOXYGEN_QT_HELP=ON``; otherwise it has no
+ effect.
+
+**LLVM_DOXYGEN_SVG**:BOOL
+ Uses .svg files instead of .png files for graphs in the Doxygen output.