Building Qt Documentation
QDoc (qdoc command in qtbase) builds the documentation and is included in standard Qt 5 installations. The official Qt documentation is built using Linux based machines, requiring libraries needed for building Qt 5 and tested on the supported desktop platforms.
Note: from Qt version 5.10 LLVM/libllvm version >= 3.9 is required to build QDoc. See Installing clang for QDoc. If LLVM is not installed or it would not be found in package tree of your system, QDoc will not be built and you will not be able to build documentation. Once LLVM is installed the LLVM_INSTALL_DIR environment variable must be set pointing to its top-level installation directory.
For the standard installation of the Qt 5 repository (qt5.git), once Qt is built and installed, running make docs in the command line will build QDoc and the Qt 5 documentation set. The output will be located in qt5/qtbase/doc/ or to the directory set to qmake's QT_INSTALL_DOCS variable.
cd qt5/ make docs
In many cases, building all of Qt 5 is not necessary. To build the documentation, it is necessary to build QDoc (to generate HTML documentation) and qhelpgenerator (to package the HTML documentation into .qch files). These are both located in the qttools repository.
QDoc and qhelpgenerator depend on several Qt modules from qtbase. After the configuration step, build qtbase:
cd qt5/qtbase make
Additionally, QDoc depends on the QML DevTools library from qtdeclarative:
cd qt5/qtdeclarative/src make sub-qmldevtools
To build the documentation tools:
cd qt5/qttools/src make sub-qdoc
If only HTML documentation is needed, the step below, building qhelpgenerator is not required.
cd qt5/qttools/src/assistant make sub-qhelpgenerator
To now build the documentation:
cd qt5/ make qmake_all # needed on Qt configured for prefix build to update the per-module index directories make docs # or just make html_docs if only HTML documentation is needed
On Windows, you may use the native nmake tool, instead.
For shadow builds, the source directory and install directories are different and the global templates need to be moved to the install directories. To do so, run:
cd qtbase make install_global_docs
Building the Module Documentation
The Qt modules have their documentation built by running make docs in the command line once Qt 5 is built and installed.
cd qt3d make docs
Running qdoc Directly
QDoc builds are specified in qdocconf files which tells QDoc where to look and how to set up documentation. To run QDoc, pass the qdocconf file and the output directory as arguments.
qdoc qt3d.qdocconf -outputdir html
The modules have a qdocconf file in the src directory. The Qt_Documentation_Structure page has more information.
Building Qt4 Documentation
Build Qt as normal.
Define environment variables for QT_SOURCE_TREE and for QT_BUILD_TREE appropriately. Make sure the PATH environment variable points to the bin directory containing the qdoc3 executable.
cd path/to/qt make docs
For the online docs it may be necessary to use
cd path/to/qt make online_docs
for later versions of Qt.
For Windows™ use the nmake utility instead of make. Some Linux systems will require gmake instead of make.
If you already have Qt compiled (from the SDK, for example) and want to build some special flavour of the doc, you can call directly qdoc3 (QT_SOURCE_TREE, QT_BUILD_TREE, and QTDIR must be set appropriately), here for DITA output:
cd qt-src bin/qdoc3 tools/qdoc3/test/qt-ditaxml.qdocconf