Re: [PATCH] gitlab: remove duplication between msys jobs

[Thomas Huth <thuth@redhat.com>]

On 27/07/2023 12.39, Daniel P. Berrangé wrote:
> On Wed, Jul 26, 2023 at 08:21:33PM +0200, Thomas Huth wrote:
>> On 26/07/2023 18.19, Daniel P. Berrangé wrote:
...
>> Anyway, before we unify the compiler package name suffix between the two
>> jobs, I really would like to see whether the mingw Clang builds QEMU faster
>> in the 64-bit job ... but so far I failed to convince meson to accept the
>> Clang from the mingw package ... does anybody know how to use Clang with
>> MSYS2 properly?
> 
> AFAIK it shouldn't be anything worse than
> 
>    CC=clang ./configure ....
> 
> if that doesn't work then its a bug IMHO

No, it's not that easy ... As Marc-André explained to me, MSYS2 maintains a 
completely separate environment for Clang, i.e. you have to select this 
different environment with $env:MSYSTEM = 'CLANG64' and then install the 
packages that have the "mingw-w64-clang-x86_64-" prefix.

After lots of trial and error, I was able to get a test build here:

  https://gitlab.com/thuth/qemu/-/jobs/4758605925

I had to disable Spice and use --disable-werror in that build to make it 
succeed, but at least it shows that Clang seems to be a little bit faster - 
the job finished in 58 minutes. So if we can get the warnings fixed, this 
might be a solution for the timeouts here...

  Thomas