[oe] Using a compiler for a different target_os

[Koen Kooi]

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Hi,

The official[1] way of building a blackfin toolchain is:

* build a bfin-elf gcc (TARGET_ARCH = bfin, TARGET_OS = elf)
* use bfin-elf to compile a uclinux-uclibc uclibc (TARGET_ARCH = bfin, TARGET_OS =
uclinux-uclibc)

Is there a clean way (assuming multimachine has been inherited) to reuse the 'wrong'
toolchain for the uclibc build?

regards,

Koen

[1] According to various blackfin.uclinux.org gurus, but I have a feeling it can be done
otherwise (i.e. I have a static-flat uclibc build done the OE way).
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