cpp26-systems-stack/cmake/toolchains/osx-arch.cmake.example at main · Dmdv/cpp26-systems-stack · GitHub

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# Example helper for macOS architecture selection (not a full cross sysroot).
#
# Usage examples:
#   cmake -S . -B build_x86 -G Ninja \
#     -DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/osx-arch.cmake \
#     -DOSX_ARCH=x86_64
#
#   cmake -S . -B build_arm -G Ninja \
#     -DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/osx-arch.cmake \
#     -DOSX_ARCH=arm64
#
# Dependencies (Homebrew) must match the arch:
#   arm64  → /opt/homebrew
#   x86_64 → /usr/local  (often Rosetta Homebrew)
#
# See docs/tutorials/modern-cpp-tooling-arm-intel.md

set(CMAKE_SYSTEM_NAME Darwin)

if(NOT DEFINED OSX_ARCH)
  set(OSX_ARCH "arm64")
endif()

set(CMAKE_OSX_ARCHITECTURES "${OSX_ARCH}" CACHE STRING "macOS arch" FORCE)

if(OSX_ARCH STREQUAL "x86_64")
  set(CMAKE_SYSTEM_PROCESSOR x86_64)
  list(PREPEND CMAKE_PREFIX_PATH "/usr/local")
elseif(OSX_ARCH STREQUAL "arm64")
  set(CMAKE_SYSTEM_PROCESSOR arm64)
  list(PREPEND CMAKE_PREFIX_PATH "/opt/homebrew")
else()
  message(FATAL_ERROR "OSX_ARCH must be arm64 or x86_64 (got ${OSX_ARCH})")
endif()