Re: [yocto] Enabling tk for Python tkinter module

[Tim Orling <ticotimo@gmail.com>]

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On Tue, Sep 28, 2021 at 2:58 PM Chris Tapp <opensource@keylevel.com> wrote:

> I am trying to get PySimpleGUI running on an RPi4 using meta-raspberrypi
> with hardknott.
>
> I have created a recipe for PySimpleGUI and added the following to my
> local.conf:
>
> PACKAGECONFIG_pn-python3 = “tk”
> IMAGE_INSTALL_append = " python3 python3-modules python3-pysimplegui tk"
>
> However, the tkinter module fails to load, reporting “No module named
> _tkinter”, with a note above saying that Python may not be configured for
> Tk.
>
> Looking on the target, /usr/lib/libtk.8.so is present.
>
> It looks as if there is something else I need to do to get Python to build
> correctly, but I’m out of ideas ;-)
>

You need to add “tk” to the package config for python3
http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-devtools/python/python3_3.9.6.bb#n110

Add the following to your distro|site|local.conf (or a python3_%.bbappend)

PACKAGECONFIG:append:pn-python3 = “ tk”

( replace : with _ if you are on old release that doesn’t support the new
override syntax)

(This assumes you have meta-oe in your bblayers.conf so you can build tk,
which it sounds like you do)

This is because the _tkinter .so built by python3 is dynamically loaded
only if present
http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-devtools/python/python3/python3-manifest.json#n1161

—Tim “moto-timo” Orling


> I’ve found a few bits on the internet that seem related, but they haven’t
> helped me get things going:
>  https://www.mail-archive.com/yocto@yoctoproject.org/msg18232.html
>  https://www.yoctoproject.org/pipermail/yocto/2014-July/020547.html
>
> Any pointers on where to look would be appreciated.
>
> --
>
> Chris Tapp
> opensource@keylevel.com
> www.keylevel.com
>
>
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