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From: Richard Purdie <richard.purdie@linuxfoundation.org>
To: McClintock Matthew-B29882 <B29882@freescale.com>
Date: Fri, 25 Nov 2011 00:17:25 +0000
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Subject: Re: [RFC] gcc-cross.inc: Add depedency on BUILD_ARCH
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On Thu, 2011-11-24 at 23:56 +0000, McClintock Matthew-B29882 wrote:
> On Wed, Nov 23, 2011 at 3:40 AM, Matthew McClintock <msm@freescale.com> wrote:
> > +# we also add this to the PV so its clear in filenames
> > +# that this is arch specific even though it's labeled as
> > +# a target package
> > +PV .= "+${BUILD_ARCH_EXPANDED}"
> 
> Seems like based on discussion this should be the following instead:
> 
> PN .= "-{BUILD_ARCH}-${TARGET_ARCH}"

What we really want is something like this in cross.bbclass:

MULTIMACH_TARGET_SYS = "${BUILD_ARCH}${BUILD_VENDOR}-${BUILD_OS}"
PN .= "-${TRANSLATED_TARGET_ARCH}"

so that WORKDIR gets changed. I've not tested what this does to the
build though.

Also, looking at sstate.bbclass it does:

    elif bb.data.inherits_class('cross', d):
        bb.data.setVar('SSTATE_PKGARCH', bb.data.expand("${BUILD_ARCH}_${TUNE_PKGARCH}", d), d)
        bb.data.setVar('SSTATE_MANMACH', bb.data.expand("${BUILD_ARCH}_${MACHINE}", d), d)

so it should be sticking BUILD_ARCH into the sstate file name directly.
This should mean you can't use 32 bit sstate files on a 64 bit system
and vice versa already?

Cheers,

Richard