[yocto] Problem with Python when running oe-init-build-env

[Zoran Stojsavljevic]

Hello Raymond,

YOCTO is, per say, moving target. If you have YOCTO Krogoth, you should
have somehow frozen host Centos 7 release around this time. As you now
moving to Rocko, you need to fast-forward the whole host Centos 7 (in other
words to upgrade Centos 7) to this state (maybe to latest, it'll still
work, I guess).

Not familiar with Centos distro, really... :-(

This is a good point to mention that you, Raymond, or anybody else, need to
give to YOCTO mailing list more info about what is going on with your
setup, since we are here guessing, in The Dark. You gave one parameter
less, then it is as solving two equations with three unknown variables (so
it is pure [un]educated guess out of Blue).

All Good, after all, you solved your problem! :-)

Zoran
_______

On Wed, May 2, 2018 at 9:28 PM, Raymond Yeung <rksyeung at hotmail.com> wrote:

> Thanks Zoran.
>
>
> My Linux build machine uses Centos 7.  I thought I'd done the installation
> to Python 3.6.5.  If this is not Python3 > 3.4.0, then I'm confused.  The
> link I follow for installation is here:  https://janikarhunen.fi/how-
> to-install-python-3-6-1-on-centos-7.html
>
> > python3.6 -V
>
> Python 3.6.5
>
> >python -V
>
> Python 2.7.5
>
>
> Anyway, I realize what went wrong.  I'd Krogoth (a 2016 Poky) running
> before.  Now as I'm migrating to Rocko (a 2017 Poky), I try to solve a
> Python versioning issue by installing Python only (as above).  However,
> there may be other packages I need to update.  After getting latest
> Reference Manual, download and install latest environment, I no longer have
> python3 issue.  However, the Python version of why Python3.6 won't satisfy
> Python > 3.4.0 still puzzles me (though no longer blocking me).
>
>
> Raymond
>
>
> ------------------------------
> *From:* Zoran Stojsavljevic <zoran.stojsavljevic at gmail.com>
> *Sent:* Tuesday, May 1, 2018 11:19 PM
> *To:* Raymond Yeung
> *Cc:* yocto at yoctoproject.org
> *Subject:* Re: [yocto] Problem with Python when running oe-init-build-env
>
> Hello Raymond,
>
> The problem is that you (talking about your host distro):
> [1] Do NOT have python3 package installed;
> [2] Do have python3 package < 3.4.0 version, so you need to upgrade!
>
> So, I have no idea which host distro you are using, but:
> [1] If Debian/Ubuntu, then: apt-get install python3
>      If Fedora, then dnf install python3
> [2] If Debian/Ubuntu, then: apt-get update python3
>      If Fedora, then dnf update python3
>
> Hope this helps,
> Zoran
> _______
>
> On Tue, May 1, 2018 at 10:43 PM, Raymond Yeung <rksyeung at hotmail.com>
> wrote:
> > I'd just git cloned Rocko and meta-ti.  When I try to source
> > oe-init-build-env, I got errors:
> >
> >
> > -bash: python3: command not found
> >
> > BitBake requires Python 3.4.0 or later as 'python3'.  "python -V" gives
> > "Python 2.7.9".  "python3" is not in $PATH.  I'd followed some detailed
> > online description to install Python 3.6 on CentOS 7.  However, after
> > installation, it looks like I need to invoke it with python3.6.
> >
> >
> > How does this work now?  I suppose the oe-init-build-env script
> uses/expects
> > python3, not python3.6.
> >
> >
> > Any insight?
> >
> >
> > Raymond
> >
> >
> > --
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> > yocto at yoctoproject.org
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