Draft: macos crossplatform build with rosetta 2#6246
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…l Homebrew Add an `x64-cross` matrix entry to build-test-macos.yml that builds the Intel (x86_64) target on the self-hosted arm64 fleet, ALONGSIDE the GitHub-hosted macos-15-intel job for validation (distinct cache instance; its x64-cross artifacts are kept separate and not consumed downstream yet). The approach reproduces an Intel mac via Rosetta 2 and a parallel x86_64 Homebrew at /usr/local: putting /usr/local first on PATH makes brew, cmake, ninja, python, pkg-config, make and grep all resolve to x86_64; an x86_64 cmake reports CMAKE_SYSTEM_PROCESSOR=x86_64 (so thirdparty SIMD code paths are selected correctly) and its child compilers inherit the x86_64 slice; the x86_64 Homebrew installs x86_64 bottles. No `arch -x86_64` wrapping or thirdparty-submodule patching is needed. - build_source.sh / build_thirdparty.sh: honor CMAKE_OSX_ARCHITECTURES (cross-arch guardrail) and a caller-set NPROC (cap build parallelism); both are no-ops when unset, so native builds are unaffected. Validated end-to-end on an Apple M4: thirdparty + MeshLib core + mrbind + python bindings all build as x86_64, 294/294 unit tests pass under Rosetta, and mrmeshpy.so imports under x86_64 python. Runner prerequisite: Rosetta 2 + an x86_64 Homebrew bootstrapped at /usr/local (formulae are installed by the workflow). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Documents the Rosetta 2 + /usr/local x86_64 Homebrew approach, what the workflow/script changes add, the one-time runner prerequisite (Rosetta + x86_64 Homebrew bootstrap), a local-reproduction recipe, and validation status. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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