Fix macro leak and quiet the pragma in freestanding builds #6

	name: Freestanding

	# Compiles Eigen in the freestanding configuration this fork exists to provide,
	# and in the hosted configuration, failing if the compiler emits anything.
	#
	# This is the only CI here that covers the fork's actual purpose. Upstream's test
	# matrix never defines EIGEN_FREESTANDING, so it cannot catch a defect that only
	# appears in freestanding builds -- which is exactly what the leaked
	# PACKET_DECL_COND* macros were. See .github/scripts/check_freestanding.sh.
	#
	# Cheap enough (two -fsyntax-only compiles) to run on every push.

	on:
	pull_request:
	types: [opened, reopened, synchronize]
	push:
	branches: [feature/freestanding]
	workflow_dispatch:

	jobs:
	freestanding:
	name: freestanding compile check
	runs-on: ubuntu-24.04
	timeout-minutes: 15
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Install compiler
	run: \|
	sudo apt-get update -y
	sudo apt-get install -y --no-install-recommends g++-13

	- name: Check freestanding and hosted configurations
	env:
	CXX: g++-13
	run: ./.github/scripts/check_freestanding.sh

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