Hi,

A small heads up that from this change: https://review.trustedfirmware.org/c/hafnium/hafnium/+/11613 a developer needs to provide the LLVM/clang toolchain through the PATH environment variable.

See the documentation update: https://review.trustedfirmware.org/plugins/gitiles/hafnium/hafnium/+/HEAD/do...

Until then the toolchain was hardcoded to use the version stored in the prebuilt submodule.

From now, this weakens the dependency to the prebuilt toolchain and provides flexibility with providing an alternate toolchain on a x86 host. This also opens to building on an aarch64 host.

This has been tested with different combinations of hosts, ubuntu releases and toolchains downloaded from https://releases.llvm.org/download.html

x86_64 Ubuntu 18.04 / 20.04 clang/llvm 12.0.0 , 13.0.0 aarch64 Ubuntu 19.04 (Ampere eMAG) / 20.04, 21.04 (Rpi4) clang/llvm 12.0.0 , 12.0.1, 13.0.0

It is still possible to point PATH to the prebuilt toolchain version (Android llvm/clang 12.0.5) as indicated in the documentation.

If you have a live tree, please clean the out directory or run make clobber, once you update master. Builds run as before after the switch.

Limitations: -the build breaks if using a native toolchain installed on the host (apt-get install clang..) -the build breaks with Ubuntu 21.10/AArch64 (under investigation).

Regards, Olivier.