Improve cxx17 standard detection #637

	# Isolated = build without 3rdparty and visp-images
	name: Ubuntu-isolated

	# https://www.jeffgeerling.com/blog/2020/running-github-actions-workflow-on-schedule-and-other-events
	on:
	push:
	pull_request:
	schedule:
	- cron: '0 2 * * SUN'

	jobs:
	build-ubuntu-dep-apt:
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-22.04]
	compiler: [ {CC: /usr/bin/clang, CXX: /usr/bin/clang++} ]
	standard: [ 17 ]

	steps:
	# https://github.com/marketplace/actions/cancel-workflow-action
	- name: Cancel Previous Runs
	uses: styfle/[email protected]
	with:
	access_token: ${{ github.token }}

	- name: Checkout repository
	uses: actions/checkout@v3

	- name: Print system information
	run: lscpu

	- name: Print OS information
	run: lsb_release -a

	- name: Print compiler information
	run: dpkg --list \| grep compiler

	- name: Configure CMake
	run: \|
	mkdir build
	cd build
	CC=${{ matrix.compiler.CC }}
	CXX=${{ matrix.compiler.CXX }}
	CXX_STANDARD=${{ matrix.standard }}
	echo "CC: $CC"
	echo "CXX: $CXX"
	echo "Standard: $CXX_STANDARD"
	cmake .. -DCMAKE_C_COMPILER="${CC}" -DCMAKE_CXX_COMPILER="${CXX}" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/tmp/usr/local -DCMAKE_VERBOSE_MAKEFILE=ON -DUSE_CXX_STANDARD=$CXX_STANDARD
	cat ViSP-third-party.txt

	- name: Compile
	working-directory: build
	run: \|
	make -j$(nproc) install

	- name: Run unit tests
	working-directory: build
	run: ctest -j$(nproc) --output-on-failure

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