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  • Re: Python module installation with cmake

    From Timo =?utf-8?Q?R=C3=B6hling?=@21:1/5 to All on Fri Jul 28 09:50:02 2023
    Hi Gregor,

    * Gregor Riepl <onitake@gmail.com> [2023-07-28 09:21]:
    I'm looking for help with a regression in cmake 3.27, that is
    currently producing incorrect module installation paths for the Python >package Uranium:
    https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1042157

    I posted an explanation to debian-devel yesterday: https://lists.debian.org/debian-devel/2023/07/msg00307.html


    Cheers
    Timo

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  • From Gregor Riepl@21:1/5 to All on Fri Jul 28 09:30:02 2023
    Hi,

    I'm looking for help with a regression in cmake 3.27, that is currently producing incorrect module installation paths for the Python package
    Uranium: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1042157

    Uranium's cmake script uses the cmake variable Python_SITELIB to
    determine the installation path for Python modules, and that used to
    work correctly up until cmake 3.26.
    In 3.27, the value of this variable has changed, and it now points to /usr/local, which seems wrong to me. Furthermore, it includes the full
    Python version, which also doesn't look right:

    In 3.26.4-4, Python_SITELIB is /usr/lib/python3/dist-packages, and the documentation[1] says:
    Information returned by
    distutils.sysconfig.get_python_lib(plat_specific=False,standard_lib=False)
    or else sysconfig.get_path('purelib').

    In 3.27.1-1, it's /usr/local/lib/python3.11/dist-packages, coming from[2]:
    Information returned by sysconfig.get_path('purelib').

    There don't seem to be any other useful cmake variables that could be
    used. The relevant cmake script parts look like this:

    ####
    if(NOT DEFINED Python_SITELIB_LOCAL)
    set(Python_SITELIB_LOCAL
    "${Python_SITELIB}"
    CACHE PATH "Local alternative site-package location to
    install Uranium" FORCE)
    endif()
    install(DIRECTORY UM DESTINATION "${Python_SITELIB_LOCAL}")
    ####

    I do think this is a regression in cmake, but perhaps something was
    wrong with the script in the first place and only showed up now?

    Can someone help with sorting this issue out?

    Thanks,
    Gregor

    [1] https://cmake.org/cmake/help/v3.26/module/FindPython.html
    [2] https://cmake.org/cmake/help/v3.27/module/FindPython.html

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