wxPython Project Phoenix

Introduction

Welcome to wxPython's Project Phoenix! Phoenix is the improved next-generation wxPython, "better, stronger, faster than he was before." This new implementation is focused on improving speed, maintainability and extensibility. Just like "Classic" wxPython, Phoenix wraps the wxWidgets C++ toolkit and provides access to the user interface portions of the wxWidgets API, enabling Python applications to have a native GUI on Windows, Macs or Unix systems, with a native look and feel and requiring very little (if any) platform specific code.

How to build wxPython Phoenix

First of all, this README is intended primarily for those who want to build wxPython from a workspace checked out from the wxPython Phoenix repository. If you are not making changes to wxPython, or needing to build it for some unsupported compiler or some other hardware architecture, then you probably do not need to put yourself through the pain for building in this way. It's a complicated build, and can sometimes be confusing even for the experts. Instead, if the binaries available at PyPI are not what you need then you can use pip to build from the released source archives, or from the source archives created in the pre-release snapshot builds. See the notes about it at:

• https://wxpython.org/pages/downloads/
• https://wxpython.org/blog/2017-08-17-builds-for-linux-with-pip

Next, review the section below about prerequisites.

All aspects of the wxPython Phoenix build are managed through a series of commands provided by the build.py script. There is also a setup.py script available for those who are used to the standard distutils or setuptools types of builds. The setup.py script assumes that all of the code generation steps have already been performed, and so it is suitable for use when building from a source snapshot tarball or when using easy_install or pip. The setup.py script will delegate to build.py for the actual build, and build.py will delegate to setup.py when doing setuptoolsy things like performing an install or building a wheel.

Using the build.py script allows for greater control over the build process than setup.py does, including commands for performing the various code-generation steps. So developers working on Phoenix itself or building from a Git checkout, instead of a source snapshot tarball, should be using the build.py script. The build.py script provides a fairly simple command-line interface consisting of commands and options. To see the full list run python build.py --help. The most important commands are listed below.

Windows Users NOTE: If you are building Phoenix on Windows and have a non-English language installation of Microsoft Visual Studio then you may need to set the code page in your console window in order to avoid Unicode decoding errors. For example:

chcp 1252
python build.py <build commands>...

In addition, some tasks within the build currently expect to be able to use Cygwin on Windows (https://www.cygwin.com/) to do its work. If you have Cygwin installed in one of the default locations (c:\cygwin or c:\cygwin64) then all is well. If you have it installed somewhere else then you can set CYGWIN_BASE in the environment and the build tool will use that for the base dir.

On the other hand, if you just want to do a standard setuptools-style build using setup.py and are using a full source tarball, then you can stop reading at this point. If you want to build from a source repository checkout, or need to make changes and/or to regenerate some of the generated source files, then please continue reading.

Building wxWidgets

Since build.py will, by default, build both wxWidgets and Phoenix you will need the wxWidgets code as well. The source tarballs already include both wxWidgets and the Phoenix source code, so if you are getting your copy of the source code that way then you are all set. If you are fetching it from GitHub you will need to do an additional step. The git repository is set up to bring in the wxWidgets code as a git "submodule" so after cloning the Phoenix repository, you can get the wxWidgets source with these commands:

$ git submodule update --init --recursive

This will clone the wxWidgets repo into: Phoenix/ext/wxWidgets. Once the submodule is updated, the build script should be able to build wxWidgets.

If you would rather use an already built and installed wxWidgets then that is possible as well by changing some options, see python build.py --help for details. However be aware that doing so will require a wxWidgets that is very close to the same age as the Phoenix code, at least for the unreleased preview snapshots. In other words, the wxWidgets build should use code from the wxWidgets source repository within a few days of when the Phoenix code was checked out. Currently the master branch of Phoenix is tracking the master branch of wxWidgets.

On the other hand, it is probably best to just let wxPython build and bundle wxWidgets. The build tools will by default build wxWidgets in a way that allows it to be bundled with the wxPython extension modules as part of the wxPython package, meaning it can peacefully coexist with any wxWidgets libraries you may already have installed. This bundling of the wx shared libraries works on Windows, OSX and Linux, and probably any other unix-like system using shared libraries based on the ELF standard. The libraries are built in such a way that they are relocatable, meaning that they do not have to be in a fixed location on the filesystem in order to be found by the wxPython extension modules. This also means that you can do things like use pip to install a wxPython wheel in one or more virtual environments, move the wx package to a versioned folder, or even move it into your own project if desired, all without needing to rebuild the binaries. (Assuming that compatible Pythons are being used in all cases of course.)

The build phase of the build.py script will copy the results of the wxWidgets and Phoenix builds into the wx folder in the Phoenix source tree. This will allow you to run and test Phoenix directly from the source tree without installing it, if desired. You just need to set PYTHONPATH appropriately, or you can use python setup.py develop or pip install -e . to install an .egg-link file in your current Python site-packages folder that will point to the folder where you built wxPython Phoenix. When you are finished testing you can then use the install or one of the bdist commands like you normally would for other Python packages.

Important build.py commands

The following build.py commands are required to be able to build Phoenix from scratch. In other words, from a pristine source tree with none of the generated code present yet. They can be run individually or you can specify all of them on a single command line, in the order given. Once a command has succeeded in one run of build.py there is no need to run that command again in a later run, unless you've changed something which that command has the responsibility to process. Many of the commands require the results of the earlier commands, so at least the first time you run the build you will need to use all 4 of the commands (or their equivalents for composite commands) in the given order.

• dox: Builds the XML files from the wxWidgets documentation source, which will be used as input for the etg command.
• etg: Extracts information from the dox XML files, runs hand-written tweaker code on the extracted data structures, and runs various generators on the result to produce code for the next steps. The code being run for each item in this step is located in the etg folder in the Phoenix source tree.
• sip: This command processes the files generated in the etg command and produces the C++ code that will become the Python extension modules for wxPython Phoenix.
• build: Build both wxWidgets and wxPython. There are additional commands if you want to build just one or the other. The results will be put in the Phoenix/wx folder, and can be used from there without installation if desired, by setting PYTHONPATH so the Phoenix/wx package dir is found by Python.

Some other useful commands and options are:

• clean: Clean up the build products produced by prior runs of build.py. There are additional clean commands that will let you clean up just portions of the build if needed.

• touch: Updates the timestamp on all of the etg scripts, so they will be forced to be run in the next build. This is useful when a change has been made to the wxWidgets documentation that needs to be propagated through the build since the etg command doesn't yet do full dependency checking of the input.

• M.N: This is the Major.Minor version number of the Python that the extension modules will be built for, such as "3.3". This allows you to run build.py with a different Python than what you are building for, which is handy for things like buildbots running in a virtualenv for one Python that need to be able to run builds for other versions too.

  If build.py is not able to find the correct Python given the M.N on the command line then you can specify the full path to the python executable you want to use with the --python option.

• test: Runs all of Phoenix's unittests.

• --nodoc: This option turns off the sphinx generator when running the etg scripts. If you don't plan on generating the documentation then this will speed up the processing of the etg command.

Please see the output of python build.py --help for information about commands and options not mentioned here. And, as always, if there is any discrepancy between this document and the source code in the build.py script, then the source code is correct. ;-)

The build.py script will download doxygen, sip and waf for your platform as needed if they are not already in your Phoenix/bin folder. If prebuilt versions of these tools are not available for your platform then build.py will bail out with an error message. To continue with the build you will need to acquire copies of the tool that will work on your platform and can then tell build.py where to find it using an environment variable, as described in the error message.

Example build command-lines

To do a complete build from a totally clean git workspace, you will need to use several of the commands listed above. For example:

python build.py dox etg --nodoc sip build

Subsequent builds can leave out some of the commands if there were no changes which would require those commands to be run again. For example, if you wanted to just rebuild the Phoenix extension modules you could do this:

python build.py build_py

If you've changed one of the etg files and need to regenerate and rebuild the source affected by that change, then you can use a command like this:

python build.py etg --nodoc sip build build_py

Project directory structure

There are a lot of subfolders in this directory, here is a brief explanation to help a newbie find their way around.

• build: Intermediate files produced by the build process are stored here. This folder should not be committed to a source repository.

• buildtools: This is a Python package containing modules that are used from build.py and setup.py and which assist with configuring and running the build.

• etg: This is where the "Extractor-Tweaker-Generator" scripts are stored. These scripts are invoked by the build and they will read the XML files produced by Doxygen and will produce interface definition files for SIP.

• etgtools: This Python package contains modules which assist with the parsing of the XML files, tweaking the collection of objects produced by the parser, and also the backend generation of code or documentation.

• ext: This folder holds the source for external projects used by Phoenix, (currently just wxWidgets) as git submodules. This allows Phoenix to use a specific revision of the code in the other projects and not depend on the developer fetching the correct version of the code on their own.

  When you first checkout the Phoenix source using git you will need to tell git to also fetch the submodules, like this:

  cd Phoenix
  git submodule init
  git submodule update --recursive
  

• sip/gen: The code (.sip files) produced by the ETG scripts is placed in this folder.

• sip/cpp: The code produced when running SIP is put in this folder. It will be C++ source and header files, and also some extra files with information about the source files produced, so the build knows what files to compile.

• sip/siplib: This is a copy of the SIP runtime library. We have our own copy so it can be included with the wxPython build as an extension module with a unique name (wx.siplib) and to not require a runtime dependency on SIP being installed on the target system. 3rd party extensions that want to integrate with wxPython should ensure that the sip.h they #include is the one in this folder.

• src: This folder is for any other source code (SIP, C++, Python, or anything else) that is edited by hand instead of being generated by some tool.

• wx: This is the top of the wxPython package. For an in-place build the extension modules and any associated files will be put into this folder. Subfolders contain pure-python subpackages of the wx package, such as wx.lib, etc.

Naming of files

To help keep things a little easier when looking for things that need to be worked on, the file names in the Phoenix project will mirror the names of the files in the wxWidgets interface headers folder. For example, if there is a interface/wx/FOO.h and we are processing the XML produced for that file then the ETG script for the classes and other items will be named etg/FOO.py and it will produce sip/gen/FOO.sip, unit tests will be in unittests/test_FOO.py, and so on.

In most cases more than one ETG/SIP file will be used to create a single Python extension module. In those cases there will be one ETG script used to bring all the others together into the single extension module (by using the back-end generator's include feature for example.) The names of those scripts will have a leading underscore, such as etg/_core.py, and all the scripts that are intended to be included in that extension module should specify that name in their MODULE variable.

Prerequisites

The following are some tips about what is required to build Phoenix for yourself. There are likely some other things that may not have been mentioned here, if you find something else that should be mentioned then please submit a PR for updating this document.

Windows

All the source code needed for wxWidgets and wxPython Phoenix are included in the wxWidgets and Phoenix source trees. In addition to a stock Python installation you will also need a copy of Visual Studio 2008 (for Python2.7 compatibility) or Visual Studio 2015 (for Python 3.x support). It should also be possible to build using Mingw32, but there will need to be some changes made to the build scripts to support that.

You may also want to get a copy of the MS SDK in order to have newer definitions of the Windows API. I typically use 7.0 or 7.1 with Visual Studio 2008.

Unfortunately Microsoft no longer distributes Visual Studio 2008. But don't panic! They have recently made available a "Microsoft Visual C++ Compiler for Python 2.7" package, which can also be used for building Phoenix for Python 2.7. Plus it's free! You can get it at: http://www.microsoft.com/en-us/download/details.aspx?id=44266

If you want to build Phoenix with debug info then you will need to first build a debug version of Python, and then use that Python (python_d.exe) to build Phoenix.

Linux

On Ubuntu the following development packages and their dependencies should be installed in order to build Phoenix. Other debian-like distros will probably also have these or similarly named packages available. Extrapolate other package names accordingly for other linux distributions or other unixes.

• dpkg-dev
• build-essential
• python3.7-dev and libpython3.7-dev # use appropriate Python version here
• freeglut3-dev
• libgl1-mesa-dev
• libglu1-mesa-dev
• libgstreamer-plugins-base1.0-dev
• libgtk-3-dev
• libjpeg-dev
• libnotify-dev
• libpng-dev
• libsdl2-dev
• libsm-dev
• libtiff-dev
• libwebkit2gtk-4.0-dev
• libxtst-dev

If you are building for GTK2 then you'll also need these packages and their dependencies:

• libgtk2.0-dev
• libwebkitgtk-dev

If You use a custom built python in a non standard location, You need to compile python with the --enable-shared option.

Mac OSX

Like the Windows platform all the source and libs you need for building Phoenix on OSX are included in the wxWidgets and Phoenix source trees, or by default on the system. In addition you will need to get the Xcode compiler and SDKs, if you don't already have it, from https://developer.apple.com/ (free registration required). You should also install the command line tools for your version of Xcode and OSX. This can usually be done from within Xcode or via a separate installer package.

Also like on Windows, using the same or similar compiler that was used to build Python usually helps things to work better and have a better chance for success. For example, the stock Python 2.7 will try to use "gcc-4.2" when building extensions, but newer versions of Xcode may not have that command available. I am currently using Xcode 7.1.1.

If all else fails it is not too hard to build Python yourself using whatever Xcode you have installed, and then use that Python when building Phoenix.

Help and Helping

Most discussions about Phoenix happen on the wxPython-dev google group (a.k.a. the wxPython-dev mail list.) If you have questions or would like to get involved please subscribe to the group at https://groups.google.com/forum/#!forum/wxpython-dev and join in.

Latest Snapshot Builds

You can find snapshots of the latest wxPython Phoenix build files, including source snapshots, wheels files for Windows and Mac, and etc. at: https://wxpython.org/Phoenix/snapshot-builds/. These files are built at most once per day, on any day that has had a commit to the master branch.