ForkUnion v3

v2.2.8 Feature

This release adds 2 notable features for engineering teams evaluating rollout.

Published 10mo Developer Productivity

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✓ No known CVEs patched

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✓ No known CVEs patched in this version

Topics

arm atomics compare-and-swap concurrency memory-model mpi

+9 more

multithreading numa openmp parallel-computing parallel-stl parallelism rayon thread-pool threadpool

Summary

AI summary

Patch module adds cross‑compile support and fixes alignment, casting, variant, and libc++ issues; Make module updates CI coverage and compilation flags; Fix module resolves alignment violations, casting errors, duplicate instantiations, and AppleClang/MSVC bugs.

Full changelog

Use the C++ Standard Library... they say!

Not an easy call when your code runs on more platforms than most standard libraries do. And now, thanks to sharp-eyed users and contributors, we’ve got two more reasons to be cautious: one in Apple Clang’s libc++, the other in MSVC.

@yrashk spotted a libc++ quirk shipped with Apple Clang: until version 19, its std::allocation_result is non‑conforming and only takes one template parameter instead of the two the standard requires. Yes, really. Here’s the shim Fork Union now carries to paper over that inconsistency:

#if defined(__cpp_lib_allocate_at_least)
#if defined(_LIBCPP_VERSION) && _LIBCPP_VERSION < 190000
    operator std::allocation_result<pointer_type>() const noexcept {
        return std::allocation_result<pointer_type> {ptr, static_cast<std::size_t>(count)};
    }
#else
    operator std::allocation_result<pointer_type, size_type>() const noexcept {
        return std::allocation_result<pointer_type, size_type>(ptr, count);
    }
#endif
#endif

@atufankjian noticed a compilation issue on MSVC, originating in its std::variant implementation, that couldn't deal with objects aligned to 128-byte boundary optimal for most new x86 server platforms and Arm chips! So we've had to implement a custom union class for our lib.cpp to pass compilation on Windows 🤦‍♂️