Hey all,
I decided to take a look again at what's needed to build and boot ARM platforms when building with clang. The good news is that this generally works now. Some size-constrained platforms don't build right now but I was able to test a reasonable part of my lab. This series also depends on: https://patchwork.ozlabs.org/project/uboot/patch/20200604203515.12971-1-trin... to fix the warning there.
At this point LTO + clang requires a bit more work, and to use llvm-ld. As the platform I was trying was still too large to link even with this, I've set that investigation aside for now.
I've boot tested clang-16 on Pi 3 (32bit, 64bit, arm64) and libretech-cc, and I'll be testing pine64_plus soon along with maybe mx6cuboxi and seeing what the failures are on am65x_evm / j721e_evm (these platforms require a bit more scripting on my part to make build and test clean).