Testing overhaul: CMake-driven test helpers & equivalence harnesses #46

	name: Format check
	on:
	push:
	branches:
	- master
	pull_request:
	branches:
	- master
	workflow_dispatch:

	# Enforces .clang-format on the C/C++ tree. A PR that introduces any
	# formatting drift fails this check with a diff in the run log. To fix
	# locally:
	#
	# clang-format -i path/to/changed/file.{c,h,C,...}
	#
	# Pinned to clang-format-20 to match the version used for the mass
	# reformat. Different clang-format major versions produce subtly
	# different output for some constructs (lambdas, switch labels,
	# requires-clauses), so version drift between local dev environments
	# and CI would cause spurious "passes locally / fails in CI" failures.

	jobs:
	clang-format:
	runs-on: ubuntu-24.04
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Install clang-format-20
	run: \|
	wget -q https://apt.llvm.org/llvm.sh
	chmod +x llvm.sh
	sudo ./llvm.sh 20
	sudo apt-get install -y clang-format-20
	clang-format-20 --version

	- name: Check formatting
	run: \|
	find src codes doc tests \
	-type f \( -name ".c" -o -name ".h" \
	-o -name ".cpp" -o -name ".hpp" -o -name "*.cxx" \) \
	-exec clang-format-20 --dry-run --Werror {} +

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