macos x64: crossplatform native build#6448
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Alternative to the Rosetta approach: build the Intel target with a NATIVE arm64 toolchain that cross-targets x86_64 (-arch x86_64), linking the x86_64 Homebrew at /usr/local. Compiles run on native arm64 clang (fast); only the output is x86_64. - ConfigureHomebrew.cmake: honor an explicit `-D HOMEBREW_PREFIX=<prefix>` override (falls back to `brew --prefix`), so a native arm64 cmake can be pointed at the /usr/local x86_64 bottles. - build_source.sh: honor a caller-set NPROC to cap build parallelism. - macos/crossplatform-builds/README.md: documents the recipe, the critical gotchas (must force CMAKE_MAKE_PROGRAM to the arm64 ninja, else CMake's find_program grabs the x86_64 ninja from /usr/local and silently compiles under Rosetta; CMAKE_PREFIX_PATH=/usr/local for find_package; x86_64 python shim), and a native-vs-Rosetta comparison. Validated on an Apple M4: native arm64 clang (Code Type: ARM64) cross-built MeshLib core to x86_64; all binaries x86_64, linked against /usr/local x86_64 dylibs; 294/294 unit tests pass under Rosetta. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Idempotent provisioning for the NATIVE (non-Rosetta) x86_64 cross build:
1. native arm64 cmake + ninja at /opt/homebrew (the build driver; installs
only if missing, no force-upgrade)
2. Rosetta 2 (only to RUN the x86_64 output + CMake configure probes; the
compilation itself is native)
3. x86_64 Homebrew at /usr/local (source of x86_64 bottles); --prewarm to
install the formulae now, else CI installs them.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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