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Max Lv bcb3731968 C++20 port 1/14: build, ownership core and allocation audit (#3065)
* 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.
2026-10-15 09:45:54 +08:00

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CMake

# Cross-compile the project from a Unix host without Docker or a MinGW SDK.
# cmake -S . -B build-windows -DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/zig-windows.cmake
set(CMAKE_SYSTEM_NAME Windows)
set(CMAKE_SYSTEM_PROCESSOR AMD64)
find_program(SS_ZIG_EXECUTABLE NAMES zig REQUIRED)
set(CMAKE_C_COMPILER "${SS_ZIG_EXECUTABLE}" cc -target x86_64-windows-gnu)
set(CMAKE_CXX_COMPILER "${SS_ZIG_EXECUTABLE}" c++ -target x86_64-windows-gnu)
# CMake's archive tools accept an executable path, not an argv list.
file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/zig-tools")
foreach(tool ar ranlib)
set(wrapper "${CMAKE_BINARY_DIR}/zig-tools/${tool}")
file(WRITE "${wrapper}" "#!/bin/sh\nexec \"${SS_ZIG_EXECUTABLE}\" ${tool} \"$@\"\n")
file(CHMOD "${wrapper}" PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
set(CMAKE_${tool} "${wrapper}")
endforeach()
set(CMAKE_AR "${CMAKE_BINARY_DIR}/zig-tools/ar")
set(CMAKE_RANLIB "${CMAKE_BINARY_DIR}/zig-tools/ranlib")
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)