[llvm-dev] Incorrect / missing dependencies in llvm build?

[Jonathan Roelofs via llvm-dev]

On 11/16/16 1:05 PM, mats petersson via llvm-dev wrote:
> Yesterday, I took latest git version of LLVM, built a makefile using
> cmake (had to update from my "old" cmake to a newer one, so picked the
> latest 3.7.0), and ran the resulting makefile with `make -j 8`. This
> failed with an error, but when I ran make again, it worked fine... My
> guess as to the problem is that there's one or more dependency that
> isn't made clear to make (or cmake), and when I run make again, it has
> built the "previously missing" one.
>
> I didn't spend much time debugging this, I may have a go tonight, I just
> wanted to raise this, in case someone else has seen this and/or has a
> solution... I was able to reproduce the problem tho', as I built llvm
> twice with different configurations, and it happened both times - and
> rerunning make resolved it both times too.

Folks on my team have seen this. From their description of the failure, 
it looked to me like it was a problem with missing dependencies on 
TableGen-generated headers... but I didn't get enough information to be 
able to track down exactly which TU was missing the dep, and I haven't 
been able to reproduce it myself.


Jon

>
> --
> Mats
>
>
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-- 
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded