[OE-core] multilib theory & practice

[Kumar Gala]

I'm looking at trying to get multilib working for powerpc.  However I'm a bit lost in how this is suppose to work from a few different perspectives:

1. from user perspective (I'm starting with a 64-bit build in /lib64 and adding 32-bit that would be in /lib):

(i've added in local/conf):
require conf/multilib.conf
MULTILIBS = "multilib:lib"
DEFAULTTUNE_virtclass-multilib-lib = "powerpc"

What should this end up producing?  Do I get a 32-bit set of libs built automatically?  What else do I need to do?

2. From a infrastructure point of view:

* Do have a single compiler that is multi-arch or 2 compilers? (not sure how the x86_64 toolchain works today)
* what areas should I investigate that might need tweaking that are arch specific?
* should I see different task names for the new multilib builds? (or the 32-bit specific builds?)

- k