Add support for macos/x86_64 wheels

cel_expr_python/BUILD

@@ -187,3 +187,15 @@ py_test(
         ],
     }),
 )
+
+# Platform definition for macOS x86_64.
+# Used for cross-compiling from arm64 macOS hosts (Apple Silicon) to x86_64.
+# This is passed to Bazel via --platforms in setup.py when building x86_64 wheels.
+platform(
+    name = "macos_x86_64",
+    constraint_values = [
+        "@platforms//os:osx",
+        "@platforms//cpu:x86_64",
+    ],
+    visibility = ["//visibility:public"],
+)

release/pyproject.toml

@@ -54,7 +54,9 @@ container-engine = "docker; disable_host_mount: True"
 before-all = "git config --global http.sslVerify false && echo 'Installing bazelisk' && cp {project}/bazelisk-linux-amd64 /usr/local/bin/bazel"
 
 [tool.cibuildwheel.macos]
+archs = ["x86_64", "arm64"]
 before-all = "echo 'Installing bazelisk'; brew install bazelisk"
+environment = { MACOSX_DEPLOYMENT_TARGET = "10.13" }
 
 [tool.cibuildwheel.windows]
 # Bazel is expected to be already installed and in the PATH on Windows.

release/setup.py

@@ -16,6 +16,7 @@
 
 import glob
 import os
+import platform
 import re
 import shutil
 import subprocess
@@ -161,7 +162,31 @@ def platform_config_windows(self, cmd, python_version):
 
   def platform_config_macos(self, cmd):
     """Applies macOS-specific Bazel configurations."""
-    cmd.extend(['--macos_minimum_os=10.13', '--cxxopt=-faligned-allocation'])
+    deployment_target = os.environ.get('MACOSX_DEPLOYMENT_TARGET', '10.13')
+    cmd.extend([
+        f'--macos_minimum_os={deployment_target}',
+        '--cxxopt=-faligned-allocation',
+    ])
+
+    archflags = os.environ.get('ARCHFLAGS', '')
+    if 'x86_64' in archflags:
+      target_arch = 'x86_64'
+    elif 'arm64' in archflags:
+      target_arch = 'arm64'
+    else:
+      machine = platform.machine()
+      if machine in ('AMD64', 'x86_64'):
+        target_arch = 'x86_64'
+      elif machine in ('arm64', 'aarch64'):
+        target_arch = 'arm64'
+      else:
+        target_arch = machine
+
+    print(f'Target architecture for macOS: {target_arch}', flush=True)
+    cmd.append(f'--macos_cpus={target_arch}')
+    cmd.append(f'--cpu=darwin_{target_arch}')
+    if target_arch == 'x86_64':
+      cmd.append('--platforms=//cel_expr_python:macos_x86_64')
 
 
 setuptools.setup(