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name: clang_check
# Builds the Arm ports with Arm Toolchain for Embedded, which is LLVM based and
# is the successor to Arm Compiler 6. The gnu ports are otherwise only ever
# built with GNU tooling, and GNU as accepts several non-canonical forms that
# LLVM's assembler rejects; this catches those before they accumulate.
on:
pull_request:
branches: [ master, dev ]
paths:
- ".github/workflows/clang_check.yml"
- "scripts/check_clang.sh"
# CMakeLists.txt, cmake/ and common_smp/ were missing until 26 Aug 2026,
# so this check did not run when the files it reads changed. The
# ports_smp example builds compile common_smp/src and the CMake stage
# reads the toolchain file and the top-level project. utility/ is
# deliberately absent: the FreeRTOS and POSIX layers under it are not
# enabled by any target this workflow builds. Keep this list and
# gcc_check.yml's the same.
- "CMakeLists.txt"
- "cmake/**"
- "common/**"
# common_modules/ holds the portable module manager that the module
# manager stage compiles once per Arm module port -- the larger half of
# what that stage builds. Without it a change there leaves the stage
# unrun, which is the same "absent from the count reads as covered" the
# stage exists to close.
- "common_modules/**"
- "common_smp/**"
- "ports/**"
- "ports_arch/**"
- "ports_module/**"
- "ports_smp/**"
jobs:
atfe:
runs-on: ubuntu-24.04
env:
# Pinned deliberately, as the runner image is: a toolchain upgrade should
# be a reviewable commit rather than something that changes underneath the
# ports. Releases: https://github.com/arm/arm-toolchain/releases
ATFE_VERSION: 22.1.0
steps:
# Actions are pinned to a commit SHA, with the version in the trailing
# comment. A tag can be moved; a SHA cannot, so this is what makes "which
# code ran in CI" answerable from the repository. Dependabot moves these
# pins and rewrites the comment with them -- see .github/dependabot.yml.
- name: Checkout sources
uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
- name: Cache Arm Toolchain for Embedded
id: cache-atfe
uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
with:
path: atfe
key: atfe-${{ env.ATFE_VERSION }}-linux-x86_64
- name: Install Arm Toolchain for Embedded
if: steps.cache-atfe.outputs.cache-hit != 'true'
run: |
set -eu
base="https://github.com/arm/arm-toolchain/releases/download/release-${ATFE_VERSION}-ATfE"
archive="ATfE-${ATFE_VERSION}-Linux-x86_64.tar.xz"
mkdir -p atfe && cd atfe
curl -fsSLO "$base/$archive"
curl -fsSLO "$base/$archive.sha256"
sha256sum -c "$archive.sha256"
tar xf "$archive"
rm -f "$archive"
- name: Build the Arm ports with clang
run: scripts/check_clang.sh --clang "atfe/ATfE-${ATFE_VERSION}-Linux-x86_64/bin/clang"
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