fix: error out if multiple wheels with the same name are produced

We shouldn't silently overwrite wheels that are produced in the same run that have the same filename, as this implies a misconfiguration.

cibuildwheel/macos.py

@@ -17,6 +17,7 @@ from .options import Options
 from .typing import Literal, PathOrStr, assert_never
 from .util import (
     CIBW_CACHE_PATH,
+    AlreadyBuiltWheelError,
     BuildFrontend,
     BuildSelector,
     NonPlatformWheelError,
@@ -408,6 +409,9 @@ def build(options: Options, tmp_path: Path) -> None:
 
                 repaired_wheel = next(repaired_wheel_dir.glob("*.whl"))
 
+                if repaired_wheel.name in {wheel.name for wheel in built_wheels}:
+                    raise AlreadyBuiltWheelError(repaired_wheel.name)
+
                 log.step_end()
 
             if build_options.test_command and build_options.test_selector(config.identifier):