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123 lines
4.6 KiB
ReStructuredText
123 lines
4.6 KiB
ReStructuredText
Building Pillow on Windows
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==========================
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.. note:: For most people, the `installation instructions
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<../docs/installation.rst#windows-installation>`_ should
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be sufficient.
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This page describes the steps necessary to build Pillow using the same
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scripts used on GitHub Actions and AppVeyor CIs.
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Prerequisites
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-------------
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Compilers
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^^^^^^^^^
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Download and install:
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* `Microsoft Visual Studio 2017 or newer or Build Tools for Visual Studio 2017 or newer
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<https://visualstudio.microsoft.com/downloads/>`_
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(MSVC C++ build tools, and any Windows SDK version required)
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* `CMake 3.15 or newer <https://cmake.org/download/>`_
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(also available as Visual Studio component C++ CMake tools for Windows)
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* `Ninja <https://ninja-build.org/>`_
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(optional, use ``--nmake`` if not available; bundled in Visual Studio CMake component)
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* x86/x64: `Netwide Assembler (NASM) <https://www.nasm.us/pub/nasm/releasebuilds/?C=M;O=D>`_
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Any version of Visual Studio 2017 or newer should be supported,
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including Visual Studio 2017 Community, or Build Tools for Visual Studio 2019.
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Paths to CMake (if standalone) and NASM must be added to the ``PATH`` environment variable.
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Visual Studio is found automatically with ``vswhere.exe``.
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Build configuration
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-------------------
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Run ``build_prepare.py`` to configure the build::
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usage: winbuild\build_prepare.py [-h] [-v] [-d PILLOW_BUILD]
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[--depends PILLOW_DEPS]
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[--architecture {x86,x64,ARM64}]
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[--python PYTHON] [--executable EXECUTABLE]
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[--nmake] [--no-imagequant] [--no-fribidi]
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Download dependencies and generate build scripts for Pillow.
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options:
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-h, --help show this help message and exit
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-v, --verbose print generated scripts
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-d PILLOW_BUILD, --dir PILLOW_BUILD, --build-dir PILLOW_BUILD
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build directory (default: 'winbuild\build')
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--depends PILLOW_DEPS
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directory used to store cached dependencies (default:
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'winbuild\depends')
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--architecture {x86,x64,ARM64}
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build architecture (default: same as host Python)
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--python PYTHON Python install directory (default: use host Python)
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--executable EXECUTABLE
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Python executable (default: use host Python)
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--nmake build dependencies using NMake instead of Ninja
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--no-imagequant skip GPL-licensed optional dependency libimagequant
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--no-fribidi, --no-raqm
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skip LGPL-licensed optional dependency FriBiDi
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Arguments can also be supplied using the environment variables PILLOW_BUILD,
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PILLOW_DEPS, ARCHITECTURE, PYTHON, EXECUTABLE. See winbuild\build.rst for more
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information.
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**Warning:** The build directory is wiped when ``build_prepare.py`` is run.
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Dependencies
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------------
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Dependencies will be automatically downloaded by ``build_prepare.py``.
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By default, downloaded dependencies are stored in ``winbuild\depends``;
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use the ``--depends`` argument or ``PILLOW_DEPS`` environment variable
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to override this location.
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To build all dependencies, run ``winbuild\build\build_dep_all.cmd``,
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or run the individual scripts in order to build each dependency separately.
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Building Pillow
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---------------
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Once the dependencies are built, run
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``winbuild\build\build_pillow.cmd install`` to build and install
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Pillow for the selected version of Python.
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``winbuild\build\build_pillow.cmd bdist_wheel`` will build wheels
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instead of installing Pillow.
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You can also use ``winbuild\build\build_pillow.cmd --inplace develop`` to build
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and install Pillow in develop mode (instead of ``python3 -m pip install --editable``).
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Testing Pillow
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--------------
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Some binary dependencies (e.g. ``fribidi.dll``) will be stored in the
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``winbuild\build\bin`` directory; this directory should be added to ``PATH``
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before running tests.
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Build and install Pillow, then run ``python3 -m pytest`` from the root Pillow
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directory.
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Example
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-------
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The following is a simplified version of the script used on AppVeyor::
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set PYTHON=C:\Python38\bin
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cd /D C:\Pillow\winbuild
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C:\Python39\bin\python.exe build_prepare.py -v --depends C:\pillow-depends
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build\build_dep_all.cmd
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build\build_pillow.cmd install
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cd ..
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path C:\Pillow\winbuild\build\bin;%PATH%
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%PYTHON%\python.exe selftest.py
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%PYTHON%\python.exe -m pytest -vx --cov PIL --cov Tests --cov-report term --cov-report xml Tests
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build\build_pillow.cmd bdist_wheel
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