Add HPX backend infrastructure with lazy initialization #27

	# Workflow to configure with cmake and build with gcc

	name: Build with gcc (Mac)

	on:
	push:
	branches: [ master, sc_release ]
	workflow_dispatch:

	# pull_request:
	# branches:
	# - '*'

	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

	jobs:
	build:

	runs-on: macos-latest

	steps:

	- name: Checkout NWgr
	uses: actions/checkout@v4
	with:
	path: NWgr

	- name: Install dependencies
	run: \|
	brew update
	brew install gcc tbb

	- name: cmake
	run: \|
	cd NWgr
	mkdir build
	cd build
	# Find the highest gcc version installed by homebrew
	GCC_VERSION=$(ls /opt/homebrew/bin/g++-* 2>/dev/null \| grep -o '[0-9]*$' \| sort -n \| tail -1)
	if [ -z "$GCC_VERSION" ]; then
	GCC_VERSION=$(ls /usr/local/bin/g++-* 2>/dev/null \| grep -o '[0-9]*$' \| sort -n \| tail -1)
	fi
	echo "Using g++-$GCC_VERSION"
	cmake .. -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_CXX_COMPILER=g++-$GCC_VERSION -DNWGRAPH_BUILD_DOCS=OFF -DNWGRAPH_BUILD_TESTS=ON

	- name: make
	run: \|
	cd NWgr/build
	# Limit parallelism to avoid potential OOM issues
	make -j4 -k

	- name: run_test
	run: \|
	cd NWgr/build
	make test

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