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X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , mreitz@redhat.com, QEMU Developers , Cleber Rosa Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 9/17/19 5:48 PM, Eduardo Habkost wrote: > On Tue, Sep 17, 2019 at 03:57:26PM +0200, Kevin Wolf wrote: >> Am 11.06.2019 um 19:12 hat Eduardo Habkost geschrieben: >>> On Tue, Jun 11, 2019 at 05:07:55PM +0100, Peter Maydell wrote: >>>> On Tue, 11 Jun 2019 at 17:03, Eduardo Habkost wrote: >>>>> >>>>> On Tue, Jun 11, 2019 at 04:50:34PM +0100, Peter Maydell wrote: >>>>>> On Mon, 10 Jun 2019 at 13:58, Peter Maydell 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 ? >>> >>> I will remove the python2/python3 patches and send a new pull >>> request. >> >> What is the plan forward with this? Are the patches dropped for good? >> >> I think the plan was to drop Python 2 after QEMU 4.2, and then it >> becomes really relevant what our minimum Python 3 version is. We've just >> had another Python version discussion in the context of iotests (John >> suggested using function annotations, but these are >= 3.5 only). >> >> Also, the fallback to Python 2 obviously makes no sense any more then, >> so maybe it's not that important to add for a single QEMU release? >> >> As Peter seems to have indicated above that he found a replacement for >> the test machine with an OS that isn't out of support, can we just >> revive this patch as it is? > > My plan is to remove Python 2 support in QEMU 4.2 (making the > fallback to Python 2 a non-issue), and require Python >= 3.5. > > Now, even if my plan is rejected and we keep supporting Python 2 > when building QEMU 4.2, my suggestion for the iotest maintainers > is to make it require Python 3.5+ immediately, just like we do > for tests/acceptance. I don't see why we should keep wasting our > energy supporting ancient Python versions in a test suite that is > not a requirement for building QEMU. > It's unfortunately now part of the 'make check' target which we use in the vm tests as a default target ... but I think we can make the push to change the build requires to 3.5+. --js