Re: [Qemu-devel] [PULL 0/8] Python queue, 2019-06-07

[Peter Maydell]

On Tue, 11 Jun 2019 at 17:03, Eduardo Habkost <address@hidden> wrote:
>
> On Tue, Jun 11, 2019 at 04:50:34PM +0100, Peter Maydell wrote:
> > On Mon, 10 Jun 2019 at 13:58, Peter Maydell <address@hidden> wrote:
> > > Hi. This fails to build on one of my buildtest machines:
> > >
> > > ERROR: Cannot use 'python3', Python 2 >= 2.7 or Python 3 >= 3.5 is 
> > > required.
> > >        Use --python=/path/to/python to specify a supported Python.
> > >
> > > The machine has python 2.7.6 and 3.4.3. (It's an Ubuntu trusty
> > > box; it's one of the gcc compile farm machines so upgrades to its
> > > OS are not really under my control.)
> >
> > Rereading this, I realise that either the check or the error
> > message is wrong here. The machine has 2.7.6, which satisfies
> > "python 2 >= 2.7", so we should be OK to build. The bug
> > seems to be that we say "prefer python3 over plain python
> > on python2" early, but don't revisit that decision if the
> > python3 we found isn't actually good enough for us.
>
> Right.  The error message is technically correct, but misleading.
> python3 is too old, but python2 would work.
>
> We can make configure not use python3 by default if it's too old,
> and fall back to python2 in this case.

Sounds good. Since I have now managed to get my alternate
aarch64 box set up, how about I apply this pullreq and you
send a followup patch which does the fallback to python/python2 ?

thanks
-- PMM