Re: [Boost-build] Dependencies dropped during concurrent builds

Subject: Re: [Boost-build] Dependencies dropped during concurrent builds
From: Nogradi, Chris (Chris.Nogradi_at_[hidden])
Date: 2013-10-29 14:56:02

On Monday, October 28, 2013 5:15 PM, Steven Watanabe wrote:
> On 10/28/2013 09:36 AM, Nogradi, Chris wrote:
> > I ran into an issue with dependencies getting dropped during concurrent
> builds.  I have submitted a Track ticket here with a sample project which
> exhibits the behavior:  https://trac.lvk.cs.msu.su/boost.build/ticket/231.
> I can provide more information if it is needed.
> >
>
> I think I've tracked this down.
> True or false?  This problem only appear when the header
> (reg_prv_intf_prj_gen.h) that #includes the missing header
> (app_pub_verify_gen.h) is produced by an action that generates multiple
> targets.

Yes. I believe this to indeed be the issue.

>
> If I split reg_gen into two actions then it seems to work.
>

I have tried fixing another instance of this issue in our code by splitting the one action into many and it appears to address the problem.  From what I can tell this is the source of 3 out 4 of the dependency issues we are seeing.  The 4th may be the same since it also involves an action with multiple targets but it is difficult to confirm.

>
> I'm working on a fix now.

Thanks! I had worked around this issue a few months ago in another area but it is becoming difficult to patch every instance that is popping up.

Chris

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