meta-clang-revival

This Yocto layer contains older CLANG versions revived from meta-clang.

meta-clang only maintains a single version of CLANG, which is always the latest version matching the LLVM version in openembedded-core.

The problem with only keeping a single LLVM or CLANG version is that crucial projects are slow to update their LLVM version support:

IGC of Intel Compute Runtime supports up to LLVM 15, with LLVM 14 being production quality for the legacy versions.
The llvmlite Python module in version 0.42 supports LLVM 22

Usage

meta-clang optionally suggests setting the default compiler to CLANG:

TOOLCHAIN ?= "clang"

When using the meta-clang-revival layer, don't do this as it wasn't tested yet.

Besides this, this layer allows building the Intel Compute Runtime in two variants:

intel-compute-runtime-legacy1 ported from an older version of intel-compute-runtime found in meta-intel that supports Intel Gen11 and older GPU plaforms. This variant is built against LLVM 14.
intel-compute-runtime (a.k.a. the current version from meta-intel) that support Intel Gen12 and newer GPU platforms. This variant is built against LLVM 15.

meta-python-ai also relies on this layer for building the python3-llvmlite package.

(C) Zoltán Böszörményi zboszor@gmail.com