View source for FutureMigrationGuide/2.2

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|This page should be used to keep track of items which should be added to the migration guide. It's a living document for the life of a development cycle and by M4 should represent a significant proportion of items that are worthy of note in the migration guide.

Once the migration guide for a release has been completed the contents of this page should be archived in a versioned subpage (i.e. [[FutureMigrationGuide/2.2]])
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=2.2 Migration Guide items=
* How we stage directories in sysroot has been simplified and introduces some new variables (SYSROOT_DIRS, SYSROOT_DIRS_NATIVE, SYSROOT_DIRS_BLACKLIST). See the v2 patch series on the OE-Core mailing list: http://lists.openembedded.org/pipermail/openembedded-core/2016-May/121365.html
* bitbake now requires python 3.4+
* the metadata now requires to use python3 syntax. There are many python3 porting guides out there, or the conversion commits for Bitbake and OE-Core can be used as a guide for changes. Particular areas of note are subprocess command line pipes needing locale decoding, the syntax for octal values changed, the iter*() functions changed name, iterators now return views, not lists and some python modules changed names.
* most target python recipes have now been switched to Python 3, unfortunately systems using RPM as a package manager and providing online package-manager support via SMART still require Python 2
* Uclibc removed in favour of musl
* ${B} no longer the default working directory for tasks