Call delocate with the correct archs

cibuildwheel/__main__.py

@@ -118,7 +118,7 @@ def main() -> None:
     if platform == 'linux':
         repair_command_default = 'auditwheel repair -w {dest_dir} {wheel}'
     elif platform == 'macos':
-        repair_command_default = 'delocate-listdeps {wheel} && delocate-wheel --require-archs x86_64 -w {dest_dir} {wheel}'
+        repair_command_default = 'delocate-listdeps {wheel} && delocate-wheel --require-archs {delocate_archs} -w {dest_dir} {wheel}'
     else:
         repair_command_default = ''
 

cibuildwheel/macos.py

@@ -250,7 +250,20 @@ def build(options: BuildOptions) -> None:
 
             if options.repair_command:
                 log.step('Repairing wheel...')
-                repair_command_prepared = prepare_command(options.repair_command, wheel=built_wheel, dest_dir=repaired_wheel_dir)
+
+                if config.identifier.endswith('universal2'):
+                    delocate_archs = 'x86_64,arm64'
+                elif config.identifier.endswith('arm64'):
+                    delocate_archs = 'arm64'
+                else:
+                    delocate_archs = 'x86_64'
+
+                repair_command_prepared = prepare_command(
+                    options.repair_command,
+                    wheel=built_wheel,
+                    dest_dir=repaired_wheel_dir,
+                    delocate_archs=delocate_archs,
+                )
                 call(repair_command_prepared, env=env, shell=True)
             else:
                 shutil.move(str(built_wheel), repaired_wheel_dir)

docs/options.md

@@ -255,7 +255,7 @@ CIBW_BEFORE_BUILD: "{package}/bin/prepare_for_build.sh"
 Default:
 
 - on Linux: `'auditwheel repair -w {dest_dir} {wheel}'`
-- on macOS: `'delocate-listdeps {wheel} && delocate-wheel --require-archs x86_64 -w {dest_dir} {wheel}'`
+- on macOS: `'delocate-listdeps {wheel} && delocate-wheel --require-archs {delocate_archs} -w {dest_dir} {wheel}'`
 - on Windows: `''`
 
 A shell command to repair a built wheel by copying external library dependencies into the wheel tree and relinking them.
@@ -264,7 +264,8 @@ The command is run on each built wheel (except for pure Python ones) before test
 The following placeholders must be used inside the command and will be replaced by `cibuildwheel`:
 
 - `{wheel}` for the absolute path to the built wheel
-- `{dest_dir}` for the absolute path of the directory where to create the repaired wheel.
+- `{dest_dir}` for the absolute path of the directory where to create the repaired wheel
+- `{delocate_archs}` (macOS only) comma-separated list of architectures in the wheel.
 
 The command is run in a shell, so you can run multiple commands like `cmd1 && cmd2`.