[Buildroot] Some analysis of the major build failure reasons

[Arnout Vandecappelle]

On 03/08/2021 12:11, Thomas Petazzoni wrote:
> Hello,
> 
> On Tue, 3 Aug 2021 12:04:13 +0200
> Arnout Vandecappelle <arnout at mind.be> wrote:
> 
>>  A simpler solution is to use 'make -Orecurse' or 'make -Otarget'. That keeps
>> the recursive output together.
> 
> True, but as you say below, it doesn't guarantee that the actual issue
> appears in the last part of the build log.
> 
>>  It may not fully help due to the "Waiting for unfinished jobs" bit - the line
>> with the failed package may appear just before that. But that can be solved by
>> first searching the "Waiting for unfinished jobs" line and cutting off
>> everything after it.
> 
> True. Needs some logic in extract_end_log() in autobuild-run.
> 
> So what should we do ? Build with -Otarget, and keep the last ~500
> lines before the "Waiting for unfinished jobs" ?

 Yeah, I think that's the way to go. Not sure if -Orecurse or -Otarget is the
way to go though, I'm still a bit fuzzy on their respective effects...

 Regards,
 Arnout

> 
>>  Additional autobuilders do help because they offer a different build
>> environment. If there's some autobuild failure that *doesn't* happen on James's
>> machines, you can be sure that it's due to the build environment.
> 
> Absolutely true, that's a very good point that you have here.
> 
> Thomas
>