Reduce total built files by 25%. #7

	name: rbx-llvm-min-baseline

	on:
	push:
	branches: [ "rubinius" ]
	workflow_dispatch:

	jobs:
	build:
	name: baseline (${{ matrix.os }})
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-latest, macos-latest]

	env:
	CC: clang
	CXX: clang++
	BUILD_DIR: build-rbx-min
	CCACHE_DIR: ${{ github.workspace }}/.ccache
	CCACHE_MAXSIZE: 2G

	steps:
	- name: Checkout llvm-project
	uses: actions/checkout@v4
	with:
	fetch-depth: 1

	- name: Install deps (Ubuntu)
	if: runner.os == 'Linux'
	run: \|
	sudo apt-get update
	sudo apt-get install -y clang ninja-build cmake ccache

	- name: Install deps (macOS)
	if: runner.os == 'macOS'
	run: \|
	brew update
	brew install ninja cmake ccache

	# Determine clang version to make cache keys stable but safe.
	- name: Get clang version
	id: vars
	shell: bash
	run: \|
	# First token after "clang version", e.g., 18.1.8
	v="$(clang --version \| head -n1 \| sed -E 's/.clang version ([0-9]+(\.[0-9]+)).*/\1/')"
	echo "clang_ver=$v" >> "$GITHUB_OUTPUT"
	echo "clang version: $v"

	- name: Restore ccache
	uses: actions/cache@v4
	with:
	path: .ccache
	key: >
	ccache-${{ runner.os }}-clang-${{ steps.vars.outputs.clang_ver }}-
	${{ hashFiles(
	'llvm/**/CMakeLists.txt',
	'mlir/**/CMakeLists.txt',
	'llvm/cmake/*/',
	'mlir/cmake/*/'
	) }}
	restore-keys: \|
	ccache-${{ runner.os }}-clang-${{ steps.vars.outputs.clang_ver }}-
	ccache-${{ runner.os }}-

	- name: Configure minimal LLVM+MLIR (with ccache)
	run: \|
	make config

	- name: Build baseline
	run: \|
	make build

	- name: ccache stats
	if: always()
	run: \|
	ccache -s \|\| true

	- name: Run Tests
	run: \|
	make test

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