Re: [Qemu-devel] [RFC] Require Python 3 for building QEMU

[Eduardo Habkost <ehabkost@redhat.com>]

On Sat, Oct 13, 2018 at 08:20:25PM +0200, Max Reitz wrote:
> On 13.10.18 07:02, Eduardo Habkost wrote:
> > Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> > ---
> > I'd like to do this in QEMU 3.1.  I think it's time to drop
> > support for old systems that have only Python 2.
> > 
> > We still have a few scripts that are not required for building
> > QEMU that still work only with Python 2 (iotests being the most
> > relevant set).  Requiring Python 3 for building QEMU won't
> > prevent people from using those scripts with Python 2 until they
> > are finally ported.
> 
> It very much does because the iotests specifically use the python path
> qemu was configured with.
> 
> To fix this, configure would need to write something else for into
> tests/qemu-iotests/common.env for $PYTHON.  But what?  I don't really
> want to introduce a new configure option for this.

What's wrong with '/usr/bin/env python2' and just using the
python2 binary from $PATH?  Why do we need to make the Python
interpreter path for iotests configurable?

> 
> So the real fix is indeed to make the iotests work with Python 3, and I
> think that needs to be done before we can require Python 3.  Maybe it
> even needs to be done at the same time.

I agree that this would be even better.  I just don't think the
pending iotest porting should force all the rest of the build
scripts to be compatible with Python 2.

-- 
Eduardo