partial fix #14581 (CI: run 'make test' with some old gcc versions) #5

	# the purpose of this github action is to test that cppcheck source code can be compiled using old gcc versions.
	# the gcc images we use here are copied from the official gcc images on docker hub

	name: gcc-versions

	on:
	push:
	branches:
	- 'main'
	- 'releases/**'
	- '2.*'
	tags:
	- '2.*'
	pull_request:

	permissions:
	contents: read

	jobs:
	build:

	strategy:
	matrix:
	#image: ["ghcr.io/cppcheck-opensource/gcc:5.4", "ghcr.io/cppcheck-opensource/gcc:6.5", "ghcr.io/cppcheck-opensource/gcc:7.5", "ghcr.io/cppcheck-opensource/gcc:8.5", "ghcr.io/cppcheck-opensource/gcc:9.5"]
	image: ["ghcr.io/cppcheck-opensource/gcc:5.4"]
	fail-fast: false

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	with:
	persist-credentials: false

	- name: Build cppcheck
	run: \|
	# FIXME: simplecpp-1.8.0 can't be compiled with gcc 5.4, so we can't run 'make test' now
	#docker run --rm -v ${{ github.workspace }}:/cppcheck -w /cppcheck ${{ matrix.image }} make -j$(nproc) CXXOPTS="-Werror" test
	docker run --rm -v ${{ github.workspace }}:/cppcheck -w /cppcheck ${{ matrix.image }} g++ -fsyntax-only -Iexternals -Iexternals/picojson -Iexternals/simplecpp -Iexternals/tinyxml2 -std=c++11 -Wno-multichar lib/*.cpp

Provide feedback