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 0.43 supports LLVM 14 or 15

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 [email protected]