Cross-building lld/llvm needs a HOST-runnable llvm-tblgen to generate the
Options.inc opt-parser sources, and it must match the LLVM 21 source tree.
Both recipes referenced ${COOKBOOK_HOST_SYSROOT}/bin/llvm-tblgen, but the
cookbook does not export COOKBOOK_HOST_SYSROOT, so the path collapsed to the
host /bin/llvm-tblgen. On a rolling distro that is now LLVM 22, whose
-gen-opt-parser-defs backend requires a 'SubCommand' TableGen class absent
from LLVM 21's OptParser.td:
error: The class 'SubCommand' is not defined
Default COOKBOOK_HOST_SYSROOT to the redoxer toolchain (host-runnable LLVM
21.1.2 llvm-/clang-tblgen), exactly as the sibling clang21 recipe already
does. Fixes the full-target build reaching mesa's LLVM build-deps.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
vasilito
312659fe21