Qt for Python/GettingStarted/X11
- GCC (Linux)
- A Python interpreter (version Python 3.5+ or Python 2.7). One possibility is to to use a package from https://www.python.org/downloads/ , a system installed package with an appropriate version should work as well.
- Qt 5.12
- libclang 6.0 (for 5.12)
- CMake from https://cmake.org/download/ (>= 3.1)
- Git (>=2)
- virtualenv (strongly recommended, but optional)
- Python sphinx package for documentation (optional, pip install sphinx)
- Depending on the distribution used, other dependencies may be required, such as:
- python-dev (or python3-dev)
- python-distutils (or python3-distutils)
- python-setuptools (or python3-setuptools)
Building from sources
Setting up CLANG
- Download libclang, e.g.
- Extract the files, e.g.
7z x libclang-release_60-linux-Rhel7.2-gcc5.3-x86_64-clazy.7z
- Export the installation path to the path you choosed to place the files
- Clone the official repository:
git clone --recursive https://code.qt.io/pyside/pyside-setup
- Check out the version you want to build, e.g. 5.12. Keep in mind that you must use the same version as your Qt installation.
cd pyside-setup && git checkout 5.12
- Check your Qt installation path, to specifically use that version of qmake to build PySide2:
- Build can take a few minutes, so it is recommended to use more than one CPU core (e.g. 8). Remember to replace the paths to your current qmake path:
python setup.py build --qmake=/path/to/qmake --build-tests --ignore-git --parallel=8
- To install on the current directory, just run:
python setup.py install --qmake=/path/to/qmake --openssl=/path/to/openssl --build-tests --ignore-git --parallel=8
- You can execute one of the examples to verify the process is properly working.
- Remember to properly set the environment variables for Qt and PySide2.
Development happens in the 5.12 and dev branches of the pyside-setup repository.
The top level repository has the following submodules:
- sources/pyside2-tools: uic, rcc tools
- examples/ (5.6 only, examples are no longer a submodule in 5.9+)
Contributions follow the standard process.
It is helpful to have debug binaries or symbols for Python available. Debug packages can be installed separately in some Linux distributions (e.g.: Ubuntu, the packages python3-dbg, libpython3-dbg provide a debug binary python3-dbg)
If your distribution does not include them, you can download python sources and compile it by yourself, e.g.
./configure --prefix=/where/to/install/python/path CFLAGS="-O0 -fno-inline -fno-omit-frame-pointer -g" LDFLAGS="-O0" CPPFLAGS="-O0" OPT="-O0 -g" make make install
It is also recommended to use a Virtual Environment for testing to be able to always start from a clean base and avoid issues with write permissions in installations.
A new virtual environment can be created as follows:
virtualenv -p /usr/bin/python3-dbg testenv
Please take into consideration that the binary name might be different in your system, and that you can choose a different name for the environment instead of testenv.
- Wrong RUNPATH / rpath
If you choose to build Python from sources in shared library configuration, it might be the case that the rpath is not set properly, which means that the built python binary might use the system python shared library, instead of the custom build shared library. You can patch the interpreter rpath values with a binary that PySide2 provides:
cd pyside-setup ./patchelf --set-rpath /path/to/your/local/python/lib /path/to/your/python/virtualenv/binary/python
And then you can proceed to re-install PySide2. (you can check if the patch worked with readelf -d /path/to/your/python/virtualenv/binary/python)
- Missing libICU causes linking problems
From 5.9+ you can get a copy of libICU by specifying --standalone (but not including --iculib-url) as an argument to setup.py execution.
- Recompile with -fPIC
env PYTHON_CFLAGS=-fPIC pyenv install -v 2.7.8