[libvirt] Likely build race, "/usr/bin/ld: cannot find -lvirt"

[Ian Jackson]

Ian Jackson writes ("Likely build race, "/usr/bin/ld: cannot find -lvirt""):
> tl;dr:
> 
> I think there is a bug in libvirt's build system which, with
> low probability, causes a build failure containing this message:
>   /usr/bin/ld: cannot find -lvirt
> 
> Complete build logs of two attempts:
> 
>   http://logs.test-lab.xenproject.org/osstest/logs/123046/build-i386-libvirt/6.ts-libvirt-build.log
> 
>   http://logs.test-lab.xenproject.org/osstest/logs/123096/build-i386-libvirt/6.ts-libvirt-build.log

I have run a number of attempts.  Out of 5 more, 1 succeeded.  So out
of a total of 7 attempts, 1 succeeded.  This repro rate is an IMO
excellent opportunity to debug this race :-).

Ian.