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Re: [RFC PATCH 2/2] gitlab-ci: Add a job building TCI with Clang


From: Thomas Huth
Subject: Re: [RFC PATCH 2/2] gitlab-ci: Add a job building TCI with Clang
Date: Thu, 21 Jan 2021 19:28:47 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0

On 21/01/2021 19.13, Daniel P. Berrangé wrote:
On Thu, Jan 21, 2021 at 03:05:43PM -0300, Wainer dos Santos Moschetta wrote:
Hi,

On 1/21/21 7:08 AM, Thomas Huth wrote:
On 10/01/2021 17.27, Philippe Mathieu-Daudé wrote:
Split the current GCC build-tci job in 2, and use Clang
compiler in the new job.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
RFC in case someone have better idea to optimize can respin this patch.

   .gitlab-ci.yml | 22 ++++++++++++++++++++--
   1 file changed, 20 insertions(+), 2 deletions(-)

I'm not quite sure whether we should go down this road ... if we wanted
to have full test coverage for clang, we'd need to duplicate *all* jobs
to run them once with gcc and once with clang. And that would be just
overkill.

I agree with Thomas.



I think we already catch most clang-related problems with the clang jobs
that we already have in our CI, so problems like the ones that you've
tried to address here should be very, very rare. So I'd rather vote for
not splitting the job here.

We got only one clang job on GitLab CI...

   build-clang:
     <<: *native_build_job_definition
     variables:
       IMAGE: fedora
       CONFIGURE_ARGS: --cc=clang --cxx=clang++
       TARGETS: alpha-softmmu arm-softmmu m68k-softmmu mips64-softmmu
         ppc-softmmu s390x-softmmu arm-linux-user
       MAKE_CHECK_ARGS: check

... and others on Travis:

   "Clang (user)"

   "Clang (main-softmmu)"

   "Clang (other-softmmu)"

I guess these three overlap partially with the build-clang job.

   "[s390x] Clang (disable-tcg)"

Don't forget the  Cirrus CI jobs for freebsd and macOS will
be using  CLang too.

Right... we should work towards getting cirrus-run into the QEMU-CI, too, to finally have these in the gitlab-ci dashboard, too.


So I've some questions:

  * Can we move those first three Travis jobs to Gitlab CI? (I can work on
that)

Yeah, if we move those three travis jobs they can replace the existing
build-clang job. We don't neccesssarily need to keep them as three
separate jobs - that split was just due to the Travis time limits.
If a different split works better on GitLab we can do that.

Well, if we really want to increase the amount clang jobs, one of them should likely use TCI, as Phillippe suggested.

  * Do you think they cover the most common problems with clang?

Should do I think, especially in addition to the Cirrus CI jobs.

I concur.

 Thomas




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