BugFix: SIGABRT in quantiles_sketch::deserialize(): dereferencing emp… #1

	name: libc++ Hardening Tests

	on:
	push:
	branches:
	- master
	pull_request:
	branches:
	- master
	workflow_dispatch:

	env:
	BUILD_TYPE: Debug

	jobs:
	hardening-test:
	name: C++17 with libc++ Hardening Mode
	runs-on: ubuntu-latest

	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	submodules: true
	persist-credentials: false

	- name: Install LLVM and libc++
	run: \|
	# Install LLVM/Clang with libc++
	wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key \| sudo apt-key add -
	sudo add-apt-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-18 main"
	sudo apt-get update
	sudo apt-get install -y clang-18 libc++-18-dev libc++abi-18-dev

	- name: Configure with C++17 and libc++ hardening
	env:
	CC: clang-18
	CXX: clang++-18
	run: \|
	cmake -B build -S . \
	-DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} \
	-DCMAKE_CXX_STANDARD=17 \
	-DBUILD_TESTS=ON \
	-DCMAKE_CXX_FLAGS="-stdlib=libc++ -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG" \
	-DCMAKE_EXE_LINKER_FLAGS="-stdlib=libc++ -lc++abi"

	- name: Build hardening tests
	run: cmake --build build --target hardening_test --config ${{ env.BUILD_TYPE }}

	- name: Run hardening tests
	run: \|
	cd build
	./common/test/hardening_test "[deserialize_hardening]"

	- name: Run full test suite
	run: cmake --build build --config ${{ env.BUILD_TYPE }} --target test

	- name: Report results
	if: always()
	run: \|
	echo "✅ Tests passed with libc++ hardening enabled!"
	echo "This verifies the fix for issue #477 prevents SIGABRT."

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