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* Enable C++20 alongside C11 in the build Add CXX to the project with C++20 (no extensions) and build C++ sources with -Wextra -fno-exceptions -fno-rtti -fno-threadsafe-statics on top of the existing warning flags. Give every toolchain a C++ compiler: the zig Windows toolchain, the static macOS/Windows CI jobs, the static musl image (clang++ plus libstdc++ headers) and the RPM spec. * Add C++20 ownership and allocation core Header-only primitives for the no-heap-after-startup design: Result/Status, Region, ObjectPool with PoolPtr (std::unique_ptr with a pool deleter), generation-checked Handle and asynchronous close support, intrusive RefPtr, FixedBuffer, MonotonicArena, FixedHashMap and FixedLru, IntrusiveList, and a bounded FixedHeap for third-party allocator hooks. Unit tests cover each primitive (test_core_*). scripts/check_no_heap.py rejects heap allocation in C++ sources under src/ and runs as a ctest. clang-tidy now also analyses C++ sources and the core headers. * Add heap allocation audit for relayed connections alloc_counter is a preloadable malloc counter (glibc, macOS) that writes a snapshot on SIGUSR2. measure_alloc.py warms ss-local and ss-server up, snapshots both, relays more connections and reports allocations per connection. It runs report-only as the alloc_audit_report ctest. interop.peers() now yields the started processes. * Document the C++20 port and allocation baseline docs/cpp-core.md describes the language profile, the core primitives, the phase plan and the measured C baseline (77-89 allocations per connection in ss-server, 27-39 in ss-local). The compatibility contract now keeps the C11 public header instead of a C11 code base. CLAUDE.md drops stale libev, submodule and gnu99 references. * Fix CI for the C++ core: libstdc++ headers, static unwinder, newer clang - docker/static: Alpine's libstdc++ headers come with g++, and the C++ tests' static libstdc++ needs an unwinder that compiler-rt lacks; add g++ and llvm-libunwind. - FixedBuffer: drop the unused kCapacity (clang-tidy 18 reports it as a dynamically initialized header static). - ss-server on Windows: manager_addr was only read in POSIX-only code, which newer clang rejects (-Wunused-but-set-global); say that the option is ignored there. * CI: allow running the test and build workflows by hand Stacked PRs target their parent branch, which these workflows do not trigger on; workflow_dispatch lets each layer run the full matrix. * CI: let clang-tidy ignore GCC-only warning flags The compile database comes from a GCC build, whose flags (for example -Wno-class-memaccess) clang-tidy does not know and reports as errors.