[yocto] [Openembedded-architecture] Sum up - Proposal: dealing with language-specific build tools/dependency management tools

[Josef Holzmayr]

I'll give it a shot and try to sum up the current state of affairs in 
this discussion. In accordance to the "Package managers all the way 
down"-presentation, I'm gonna use the term LPM (for language package 
manager) for now on.

*Requirements*
- repeatable and verifyable licensing of all dependencies that a LPM 
pulls in.
- locking down specific versions of packages and their dependencies for 
reproductible builds.

*Optionals*
- strict separation of fetch, compile, install stages. If a specifc LPM 
requires it, those might be intermingled or left out [Mark]
- opaque packaging: similar to static linking, we should at least have a 
way to bundle up a complete application into a single package. Maybe it 
might even be the default (like rust does it at the moment).
- leverage as much as possible of the functionality the LPMs provide 
instead of reimplementing it.

*Wish List*
- separating out the LPM infrastructure into one or more distinct 
layers, not treating it as OE/bitbake core functionality. [Paul]
- support for the use of multiple languages/LPMs inside a single recipe, 
hopefully even package. [myself]

*Proposed Solutions*
- having lockdown files shipped with the recipes (in whatever form to be 
defined)
- leveraging the recipe system to resolve licensing.

If we can boil things down to the common set that we all expect, it will 
in my opnion serve as a blueprint for the actual implementation to follow.

Greetz,
-- 
Josef Holzmayr
Software Developer Embedded Systems

Tel: +49 8444 9204-48
Fax: +49 8444 9204-50

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_____________________________________________________________
Amtsgericht Ingolstadt - GmbH: HRB 191328 - KG: HRA 170363
Geschäftsführer: Dr.-Ing. Michael Sorg, Dipl.-Ing. Franz Sorg
USt-IdNr.: DE 128592548