Move to python3 host tool compiliation

[Jonas Lochmann]

Am Fri, Nov 07, 2025 at 10:04:08AM +0100, schrieb Christian Marangi (Ansuel):
> Hi all,
> 
> This is mostly feedback request on a change I would like to merge.
> This is the PR in question [1].
> 
> It transition from using host python3 to compile one from source.

I like the idea. I am wondering about other potentially low(er) hanging
fruits in this field as I remember the build process complaining about
my incompatible awk.

> The reason is simple. We had multiple times where things ""explode""
> as the symbolic link for python gets corrupted after a python version
> update.
> 
> This got even more relevant recently as they started to spam new
> versions of python almost weekly.

This is something where I personally don't agree. I would not use a
unstable/rolling release distribution for something like building
OpenWrt. But I see that there are people that do this.

> To solve this problem once and for all (also also have a more
> predictable host tools) we compile python from source and
> use our version directly without depending on the one present
> on the host.
> 
> The compilation increase is minimal and also we still provide an
> option to use the previous implementation of using the host python.
> 
> Is anyone against this change or do you find any problem?

At the concept level, I would remove the option to use the host python.
This sounds like an invitation for people to "optimize" stuff and then
complain.

At the code level, there are a few things that I dislike and a few
things I don't understand. See the PR for details. I am pretty sure
that this are only minor things.