Re: [XEN PATCH 2/2] automation: Check if ninja is available before building QEMU

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 08/07/2021 11:52, Anthony PERARD wrote:
> On Wed, Jul 07, 2021 at 06:46:03PM +0100, Andrew Cooper wrote:
>> On 07/07/2021 17:40, Anthony PERARD wrote:
>>> ninja is now required to build the latest version of QEMU, some
>>> container still don't have ninja and attempting to add it breaks the
>>> build for different reasons, so QEMU will be skip on those containers.
>>>
>>> Failures:
>>> - ubuntu/xenial:
>>>     fatal: ninja version (1.5.1) incompatible with build file 
>>> ninja_required_version version (1.7.1).
>>> - debian/unstable-i386: (debian-unstable-32)
>>>     /build/tools/flask/policy/Makefile.common:115: *** target pattern 
>>> contains no '%'.  Stop.
>>> - suse/opensuse-tumbleweed:
>>>     failed to build iPXE
>>> - debian/unstable:
>>>     update of the container fails with:
>>>         The following packages have unmet dependencies:
>>>          clang-8 : Depends: libstdc++-8-dev but it is not installable
>>>                    Depends: libgcc-8-dev but it is not installable
>>>                    Depends: libobjc-8-dev but it is not installable
>>>                    Recommends: llvm-8-dev but it is not going to be 
>>> installed
>>>                    Recommends: libomp-8-dev but it is not going to be 
>>> installed
>> Only the first failure seems to be related to ninja.
>>
>> The second is a known bug which still needs addressing.  Our build
>> system's logic to cope with `checkpolicy` being absent doesn't work.
>>
>> Tumbleweed is generally broken and fails at ./configure due to missing
>> compression libraries.  It is quite possible that the iPXE failure is
>> related.
>>
>> The final one is probably because unstable has dropped clang-8.  The
>> container hasn't been rebuilt in a while because we still haven't got
>> auto-rebuild sorted.
>
> So those containers are ones that I've noticed needed ninja (as found
> out by looking at a single pipeline), but one which trying to install
> ninja and thus rebuilding the container mean that the build was broken.
> I just didn't want to spend time trying to fix issues that should have
> been found out by a regular rebuild of the containers.

That's fine, but as these containers weren't rebuilt, the details of any
knock-on error aren't relevant here.

I'd go with simply:

"ninja is now required to build the latest version of QEMU, and not all
distros have a suitable version.  Skip the QEMU build when ninja is not
available".

Can fix on commit if you're happy with this.

~Andrew