The feature I want to develop is the possibility to choose whether to
bundle or not the system libpython.
If the target computer already has a libpython, adding it to application
is a waste of space. The idea is to add to PyInstaller the ability to
remove the standard library from the application and use the system
libpython.
To develop this feature I'll work on builder and bootloader: the overall
plan is to have the builder not to bundle the libpython, and the
bootloader to use the system libpython.
In class Analysis in module build.py it will be possible to pass a new
parameter called use_system_library whose default value is False (in
this case the build system libpython is bundled as usual), instead if
the value is True the application must use the system library and the
libpython is not included in the Analysis' results. Excluding the
bundling of libpython will be made after the function
fixMissingPythonLib - after the invocation of this function, we can be
sure that the libpython has been located somehow by the build system and
that it's already scheduled for inclusion, so it makes sense to just
remove it from the Analysis' results at this point.
The choice whether to import or not the libpython is done in Analysis
because this phase is always done and doing this choice after that could
lead to code duplication, or to necessity to pass superfluous
information (e.g. an EXE with exclude_binaries=True doesn't need the
list of binaries, because COLLECT will collect them - so should I add
this option as an argument to EXE, I would still have to pass it the
full list of binaries).
To save this information I will not change the cookie structure, but
change the value in pyvers to negative if the user wants to use the
Python system library.
In bootloader the idea is to change the loadPython function, so that
before throwing an error when not finding the bundled libpython, the
function checks the presence of a system libpython (how this search is
performed in detail depends on the operating system). In my planned
implementation the system libpython's version must match the same that
could be found on the build machine. If nothing is found the program
throws an error.
If somebody wants to comment on the above, I'll gladly take your
suggestions into account during development.
Matteo
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