llvm dev - Nov 2016 - Incorrect / missing dependencies in llvm build?

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.

--
Mats
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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
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
-- 
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded

I sometimes see this with a clean build and most often it is
'Attributes.inc' that is missing.  I usually have to 'touch
Attributes.td' for this.  But I don't know CMake well enough to know how
to fix these issue properly.

	MartinO

-----Original Message-----
From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of Jonathan
Roelofs via llvm-dev
Sent: 16 November 2016 20:11
To: mats petersson <mats at planetcatfish.com>; llvm-dev <llvm-dev at
lists.llvm.org>
Subject: Re: [llvm-dev] Incorrect / missing dependencies in llvm build?



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
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
--
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded
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