GitHub macos-14运行器中cibuildwheel+scikit-build-core致CMAKE_SYSTEM_PROCESSOR值错误

在macOS 14（arm64）环境中，使用cibuildwheel构建Python wheel时，CMake的CMAKE_SYSTEM_PROCESSOR变量输出为x86_64，但预期值应为arm64。直接通过CMake命令行构建时，该变量能正确输出arm64。

复现文件 #

main.cpp #

#include <iostream>

int main() {
    std::cout << "hello\n";
}

CMakeLists.txt #

cmake_minimum_required(VERSION 3.25)
project(hello)
set(CMAKE_CXX_STANDARD 17)
message("CMAKE_SYSTEM_PROCESSOR: ${CMAKE_SYSTEM_PROCESSOR}")
add_executable(hello main.cpp)

build-wheel.yml（存在问题的wheel构建工作流） #

name: build-wheels

on:
  push:

jobs:
  build_wheels:
    name: Build wheel
    runs-on: macos-14

    steps:
      - uses: actions/checkout@v3

      - name: Select Xcode
        run: sudo xcode-select -s /Applications/Xcode_15.4.app
      
      - name: Install Homebrew and packages
        run: |
          /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
          brew update
          brew install ninja

      - name: Build wheels
        uses: pypa/cibuildwheel@v2.19
        env:
          CIBW_BUILD: cp38-macosx_arm64
          CIBW_BUILD_VERBOSITY: 2
          CIBW_ENVIRONMENT_MACOS: >
            CC=gcc-14
            CXX=g++-14
            MACOSX_DEPLOYMENT_TARGET=13.0

pyproject.toml #

[build-system]
requires = ["scikit-build-core>=0.9.0"]
build-backend = "scikit_build_core.build"

[project]
name = "hello"
version = "0.0.1dev0"

requires-python = ">=3.8"
dependencies = []

classifiers = [
  "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
  "Programming Language :: Python :: 3 :: Only",
  "Programming Language :: Python :: 3.8",
  "Programming Language :: Python :: 3.9",
  "Programming Language :: Python :: 3.10",
  "Programming Language :: Python :: 3.11",
  "Programming Language :: Python :: 3.12",
]


[tool.scikit-build]
wheel.expand-macos-universal-tags = true
cmake.version = ">=3.25"
cmake.build-type = "Release"
cmake.verbose = true
logging.level = "INFO"

[tool.cibuildwheel]
build = "*"
skip = "cp3{6,7}-*"

build.yml（可正常获取arm64值的直接构建工作流） #

name: build

on:
  push:

jobs:
  build:
    name: Build
    runs-on: macos-14

    steps:
      - uses: actions/checkout@v3

      - name: Select Xcode
        run: sudo xcode-select -s /Applications/Xcode_15.4.app
      
      - name: Install Homebrew and packages
        run: |
          /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
          brew update
          brew install ninja

      - name: "Build"
        run: |
          rm -rf build && mkdir build && cd build
          cmake -DCMAKE_C_COMPILER=gcc-14 \
                -DCMAKE_CXX_COMPILER=g++-14 \
                -DCMAKE_BUILD_TYPE=Release \
                -GNinja .. 
          ninja

内容的提问来源于stack exchange，提问作者Jiawei Lu