[eigen] add eigen backend indirection #2513

	name: 'CppCheck'

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]
	schedule:
	- cron: '0 0 * * */5'

	permissions:
	contents: read

	jobs:
	build:
	runs-on: ubuntu-24.04
	steps:
	- name: Harden Runner
	uses: step-security/harden-runner@0080882f6c36860b6ba35c610c98ce87d4e2f26f # v2.10.2
	with:
	egress-policy: audit
	- name: Checkout
	uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
	- name: Install
	run: \|
	( cd /tmp
	git clone --depth 1 'https://gitlab.com/libeigen/eigen'
	cmake -S 'eigen' -B 'eigen/build'
	cmake --build 'eigen/build' --parallel 4
	sudo cmake --install 'eigen/build' )
	( cd /tmp
	git clone --depth 1 'https://github.com/danmar/cppcheck.git'
	cmake -S 'cppcheck' -B 'cppcheck/build'
	cmake --build 'cppcheck/build' --parallel 4
	sudo cmake --install 'cppcheck/build' )
	- name: Verify
	run: \|
	cppcheck \
	--enable=all \
	--error-exitcode=1 \
	--suppress=missingIncludeSystem \
	--suppress=preprocessorErrorDirective \
	--suppress=unusedFunction:include/fcarouge/format.hpp \
	--verbose \
	-I benchmark/include \
	-I include \
	-I support/eigen \
	-I support/generator \
	-I support/lazy \
	-I support/mp_units \
	-I support/naive \
	.

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