Liberal use of cancel-in-progress on workflows #74

	# Combined cargo check with LLVM installation for the three major platforms.

	name: Cargo Check
	on: ["push", "pull_request"]

	# Cancel in-progress runs for previous commits if there are any that haven't completed yet.
	concurrency:
	group: ${{ github.workflow }}-${{ github.event.pull_request.number \|\| github.ref }}
	cancel-in-progress: true

	jobs:
	check:
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-latest, windows-latest, macos-latest]
	llvm-version: ["18.1.1"]

	runs-on: ${{ matrix.os }}

	# Cached checkout of the LLVM source code, excluding CLANG and any other tools we don't need.
	steps:
	- id: cache-llvm-src
	name: Cache LLVM ${{ matrix.llvm-version }} source tree
	uses: actions/cache@v4
	with:
	path: ./llvm-src
	key: ${{ matrix.os }}-llvm-${{ matrix.llvm-version }}-src

	- id: checkout-llvm
	if: steps.cache-llvm-src.outputs.cache-hit != 'true'
	name: Checkout LLVM ${{ matrix.llvm-version }}
	uses: actions/checkout@v4
	with:
	repository: llvm/llvm-project
	ref: llvmorg-${{ matrix.llvm-version }}
	path: ./llvm-src

	# Cached LLVM installation.
	- id: cache-llvm-install
	name: Cache LLVM ${{ matrix.llvm-version }} build/install output
	uses: actions/cache@v4
	with:
	path: ./llvm-install
	key: ${{ matrix.os }}-llvm-${{ matrix.llvm-version }}-install

	- id: build-llvm
	if: steps.cache-llvm-build.outputs.cache-hit != 'true'
	name: Build LLVM ${{ matrix.llvm-version }}
	working-directory: ./llvm-src
	run: \|
	cmake -S llvm -B build -G Ninja -DCMAKE_INSTALL_PREFIX=../llvm-install -DCMAKE_BUILD_TYPE=Release -DLLVM_USE_LINKER=lld

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