Building u-boot with clang

Hey folks,

I'm trying to use Yocto to build a u-boot image using clang. I need to use
clang because the system I'm targeting is not supported by GCC. So, I've
integrated the meta-clang layer and have assigned `TOOLCHAIN = "clang"` in
my local.conf. This seems to correctly select clang as the correct compiler
to use when building u-boot; I've verified this by trying to build with an
arm64 machine and seeing clang work.

However, when I switch my machine to the custom machine I'm targeting (a
powerpc variant), my yocto build fails trying to build the GCC cross
compiler for that architecture. Why is Yocto attempting to even build this
cross compiler? Is there a way for me to tell yocto to not use GCC at all?

-Anirudh

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