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Align Clang toolchain documentation across getting started, CMake build system, and module integration guides to point to Liam Girdwood's llvm-project fork repository and its authoritative README.md. Changes: - In getting_started/index.rst, replace redundant/diverging inlined compiler build and workspace clone steps with a direct pointer to https://github.com/lgirdwood/llvm-project (branch llvm-stable) and its authoritative README.md. - In developer_guides/tech/cmake.rst, remove erroneous environment variables (ZEPHYR_TOOLCHAIN_VARIANT=llvm, LLVM_TOOLCHAIN_PATH) and manual 'west build ... app/' commands. Document that Clang builds are driven via 'xtensa-build-zephyr.py --llvm-clang', point to the fork README, and retain the mandatory Integrated Assembler (IAS) policy. - In developer_guides/firmware/module_integration_guide.rst, update the toolchain comparison table build command to use --llvm-clang and cross-reference the fork README. - In developer_guides/tech/images/cmake_build_pipeline_architecture.svg, update the toolchain box to reflect '--llvm-clang (Xtensa Fork)' and wrapper invocation. Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
lgirdwood
requested review from
deb-intel,
intelkevinputnam,
mmaka1 and
mwasko
as code owners
September 21, 2026 17:26
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Summary
Aligns LLVM/Clang toolchain documentation across
getting_started/index.rst,developer_guides/tech/cmake.rst, anddeveloper_guides/firmware/module_integration_guide.rstto point directly to Liam Girdwood'sllvm-projectfork repository and its authoritativeREADME.md.Key Changes
getting_started/index.rst): Replaced redundant inlined compiler build and workspace clone instructions with a direct pointer tohttps://github.com/lgirdwood/llvm-project(branchllvm-stable) and itsREADME.mdas the authoritative Single Source of Truth for compiler setup, Windowed ABIcompiler-rtbuiltins, and workspace branches.developer_guides/tech/cmake.rst): Removed erroneous environment variables (ZEPHYR_TOOLCHAIN_VARIANT=llvm,LLVM_TOOLCHAIN_PATH) and manualwest build ... app/snippets. Documented that Clang builds are invoked viaxtensa-build-zephyr.py --llvm-clangand referenced the fork README. Retained the mandatory Integrated Assembler (IAS) policy.developer_guides/firmware/module_integration_guide.rst): Updated the toolchain comparison table build command to usextensa-build-zephyr.py -p ptl --llvm-clang /path/to/llvm-project/build --build-dir-suffix -llvmand linked to the fork README.developer_guides/tech/images/cmake_build_pipeline_architecture.svg): Updated the toolchain box to reflect--llvm-clang (Xtensa Fork)and wrapper invocation.Signed-off-by: Liam Girdwood liam.r.girdwood@linux.intel.com