[oe] [RFC][PATCH] meta-toolchain: use MULTIMACH_TARGET_SYS instead of TARGET_SYS

[Denys Dmytriyenko]

On Fri, Apr 23, 2010 at 02:43:13PM -0700, Tom Rini wrote:
> On Fri, 2010-04-23 at 16:54 -0400, Denys Dmytriyenko wrote:
> > On Fri, Apr 23, 2010 at 10:29:54PM +0200, Koen Kooi wrote:
> > > >> Yes, that needs to be done, as well as seperating the cross tools in
> > > >> case different archs need different versions (as is the case with
> > > >> angstrom, v5te and v7a need different binutils). This change largely to
> > > >> to cosmetically highlight that the toolchain is not really "universal"
> > > >> (yet).
> > > > 
> > > > And we can talk about if "universal" is really a good goal either.
> > > 
> > > I don't think we can make it "universal" without sacrificing key benefits.
> > > 
> > > > Taking a bit of a guess in the dark, an SDK with support for all the fun
> > > > stuff found on Beagleboard might not be done easily with also having
> > > > support for all the fun stuff found on some other ref board too.
> > > 
> > > The immediate problem I'm trying to address now is that having both an
> > > armv5te and armv7a toolchain installed is breaking horribly. Ideally
> > > they would coexist peacefully, but I don't know if we can manage that,
> > > without impacting the ease of use.
> > 
> > I know it's not what you are looking for, but easier workaround would be to 
> > install different toolchains in different paths... :)
> 
> Or, noting all of the very machine specific stuff Koen mentions
> elsewhere, we don't pretend it's an SDK for armv7a but just call it an
> SDK for ${MACHINE} and encode that into the PATH.

The thing is, while SDKPATH is the same by default for both of the 
incompatile toolchains (e.g. for Angstrom it is /usr/local/angstrom), the 
resulting tarballs are named with the specific architecture in the name taken 
from the FEED_ARCH:

TOOLCHAIN_OUTPUTNAME ?= "${DISTRO}-${DISTRO_VERSION}-${SDK_SYS}-${FEED_ARCH}-${TARGET_OS}-${SDK_SUFFIX}"

While not machine-specific, when installed in separate locations, can safely 
separate armv5te from armv7a. That way even the host cross tools are separated.

-- 
Denys