Begin supporting nix flakes build system #3006

	name: Build and run tests (macOS)

	on: [push, pull_request]

	jobs:
	test-macos:
	runs-on: ${{ matrix.os.id }}
	strategy:
	matrix:
	os:
	- { id: macos-13, name: 'Ventura' }
	cpp_std:
	- 'c++11'
	- 'c++17'
	fail-fast: false
	steps:
	- name: Install Dependencies
	run: \|
	brew install bison flex gawk libffi pkg-config bash

	- name: Runtime environment
	shell: bash
	env:
	WORKSPACE: ${{ github.workspace }}
	run: \|
	echo "GITHUB_WORKSPACE=`pwd`" >> $GITHUB_ENV
	echo "$GITHUB_WORKSPACE/.local/bin" >> $GITHUB_PATH
	echo "$(brew --prefix bison)/bin" >> $GITHUB_PATH
	echo "$(brew --prefix flex)/bin" >> $GITHUB_PATH
	echo "procs=$(sysctl -n hw.ncpu)" >> $GITHUB_ENV

	- name: Tool versions
	shell: bash
	run: \|
	cc --version

	- name: Checkout Yosys
	uses: actions/checkout@v4

	- name: Get iverilog
	shell: bash
	run: \|
	git clone https://github.com/steveicarus/iverilog.git
	cd iverilog
	echo "IVERILOG_GIT=$(git rev-parse HEAD)" >> $GITHUB_ENV

	- name: Cache iverilog
	id: cache-iverilog
	uses: actions/cache@v4
	with:
	path: .local/
	key: ${{ matrix.os.id }}-${{ env.IVERILOG_GIT }}

	- name: Build iverilog
	if: steps.cache-iverilog.outputs.cache-hit != 'true'
	shell: bash
	run: \|
	mkdir -p $GITHUB_WORKSPACE/.local/
	cd iverilog
	autoconf
	CC=gcc CXX=g++ ./configure --prefix=$GITHUB_WORKSPACE/.local/
	make -j${{ env.procs }}
	make install

	- name: Build yosys
	shell: bash
	run: \|
	make config-clang
	make -j${{ env.procs }} CXXSTD=${{ matrix.cpp_std }} CC=cc CXX=cc LD=cc

	- name: Run tests
	if: matrix.cpp_std == 'c++11'
	shell: bash
	run: \|
	make -j${{ env.procs }} test CXXSTD=${{ matrix.cpp_std }} CC=cc CXX=cc LD=cc

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