[libc++] Use private CMake flags to enable the pragma system_header macro when building #256478

	name: "Check code formatting"

	permissions:
	contents: read

	on:
	pull_request:
	branches:
	- main
	- 'users/**'

	jobs:
	code_formatter:
	runs-on: ubuntu-24.04
	container:
	image: 'ghcr.io/llvm/ci-ubuntu-24.04-format'
	timeout-minutes: 30
	concurrency:
	group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
	cancel-in-progress: true
	if: github.repository == 'llvm/llvm-project'
	steps:
	- name: Fetch LLVM sources
	uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
	with:
	fetch-depth: 2

	- name: Get changed files
	id: changed-files
	uses: tj-actions/changed-files@24d32ffd492484c1d75e0c0b894501ddb9d30d62 # v47.0.0
	with:
	separator: ","
	skip_initial_fetch: true
	base_sha: 'HEAD~1'
	sha: 'HEAD'

	- name: "Listed files"
	env:
	CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
	run: \|
	echo "Formatting files:"
	echo "$CHANGED_FILES"

	- name: Run code formatter
	env:
	GITHUB_PR_NUMBER: ${{ github.event.pull_request.number }}
	CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
	# Create an empty comments file so the pr-write job doesn't fail.
	run: \|
	echo "[]" > comments &&
	python ./llvm/utils/git/code-format-helper.py \
	--write-comment-to-file \
	--token ${{ secrets.GITHUB_TOKEN }} \
	--issue-number $GITHUB_PR_NUMBER \
	--start-rev HEAD~1 \
	--end-rev HEAD \
	--changed-files "$CHANGED_FILES"

	- uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
	if: always()
	with:
	name: workflow-args
	path: \|
	comments

Provide feedback