[PATCH 0/9] Update clang support for ARM

[Heinrich Schuchardt]

On 4/6/23 01:48, Tom Rini wrote:
> 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-trini@konsulko.com/
> 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).
>

I tried to build qemu_arm64_defconfig with origin/WIP/update-clang-for-arm.

CROSS_COMPILE=aarch64-linux-gnu-  HOSTCC=clang CC="clang  make-target
aarch64-linux-gnu" -j$(nproc)

I see a bunch of warnings and a build failure due to

examples/standalone/hello_world.c:15: undefined reference to `printf'

Best regards

Heinrich