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

[Max Reitz <mreitz@redhat.com>]

On 13.10.18 22:36, Eduardo Habkost wrote:
> 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?

Nothing, sounds good.  No idea why I discarded that idea.

>> 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.

True.  It just means that we have to do something about the iotests
before this patch can be merged.

Max