[yocto] Can we keep toolchain while upgrade source code?

[Raymond Yeung]

Our project currently uses Krogoth 2.1.  It's a mid-2016 release.  I'm looking into logistic of upgrading to Rocko 2.4 (a late-2017 release).

Is it possible to keep the toolchain in Krogoth 2.1 revisions, while migrating the sources to Rocko 2.4 revisions?  Has anyone done that?

Upgrading toolchain seems to be a pain-point, as it affects packages (e.g. Python 2.7 vs. Python 3) that other legacy builds may also use.

Thanks,
Raymond
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