Kernel/World/Ports compilation within jails; targeting many platforms.

[Jason Birch]

Is it considered 'good form' to do compilation for other machines,
architectures, and FreeBSD versions within jails?

As a concrete example, my 'main' system is a FreeBSD 9.1-RELEASE amd64
system, and I would like to compile FreeBSD 11-CURRENT for my BeagleBone
Black (ARMv7). Does it make more sense to create a jail environment on my
9.1-RELEASE machine to do all compilation and 'staging' for the BeagleBlack?

Originally I had just compiled gcc targeting arm and checked out sources
into a location that wasn't /usr/src/. This is simple enough for one
different target, but I'm wondering if I'll be a little bit more sane if
I've got a jail for each individual target I'm compiling for. Each jail can
then be set up with one, consistent compiler and source tree in the same
location -- even if the compiler (GCC/Clang) and source (X-RELEASE vs
Y-STABLE vs CURRENT) differ between targets?

Are this a sane thing to be doing? For those of you that have several
FreeBSD targets but do most of your set up on a single machine, how do you
logically separate your 'worlds'?

Regards,
JB