Re: [RFC PATCH] gitlab-ci: Test compilation on Windows with MSYS2

[Daniel P . Berrangé]

On Fri, Jul 09, 2021 at 04:34:54PM +0200, Thomas Huth wrote:
> On 09/07/2021 10.20, Daniel P. Berrangé wrote:
> > On Fri, Jul 09, 2021 at 09:52:18AM +0200, Thomas Huth wrote:
> > > Gitlab also provides runners with Windows, we can use them to
> > > test compilation with MSYS2.
> > > 
> > > However, it takes quite a long time to set up the VM, so to
> > > stay in the 1h time frame, we can only compile and check one
> > > target here. And there is also still a problem with compiling
> > > the multiboot.bin in pc-bios/optionrom/, so this is currently
> > > disabled, too.
> > 
> > THe gitlab VM provisioning seems quite fast (2+1/2 minutes),
> > so I guess you mean the time is sunk in intsalling msys
> > packages.
> > 
> > In the crurent Cirrus job there's a bunch of code that is
> > done to cache all the msys install, so that 90% of the time
> > we're merely extracting a local zipfile.
> > 
> > I wonder if we can do similar caching here.
> 
> Maybe, yes. It might save 10 - 15 minutes or so, I guess.
> 
> > Perhaps even
> > have 2 seprate jobs running on the windows runner. The
> > first job can just build a zip file and store it as an
> > artifact and cache it in gitlab for speed. The second
> > job can do the actual build ?
> 
> I'm not sure ... the Windows builders are likely single-threaded on Gitlab,
> too, just like the Linux containers. So that the main problem - while we can
> compile with -j8 on Cirrus, it's 8 times slower on Gitlab.

Ah yes, good point.

Since we have cirrus integration for freebsd/macos now, we ought todo
the same for Windows too.  I auto-generated the freebsd/mac logic
with libvirt-ci, but I ignored msys since it was somewhat special
in its build commands. We can still set it up manually though to
integrate

Regards,
Daniel
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