Zero out minor version of platform tags for macOS 11 and later

Add tests for target release versions

Tests using env need to copy environ to ensure that subprocess works correctly

Changelog.md

@@ -32,6 +32,8 @@ rules on making a good Changelog.
 - Existing libraries causing DelocationError were not shown due to bad string
   formatting.
   [#216](https://github.com/matthew-brett/delocate/pull/216)
+- Wheels for macOS 11 and later were using invalid literal versions in tags
+  instead of the macOS release version required by Python packagers.
 
 ## [0.11.0] - 2024-03-22
 

delocate/delocating.py

@@ -808,8 +808,18 @@ def _calculate_minimum_wheel_name(
             f"Failed to find any binary with the required architecture: {e}"
         ) from e
     prefix = wheel_name.rsplit("-", 1)[0]
+
+    # Wheel platform tags MUST use the macOS release version, not the literal
+    # version provided by macOS. Since macOS 11 the minor version number is not
+    # part of the macOS release version and MUST be zero for tagging purposes.
+    def get_release_version(version: Version) -> str:
+        """Return the macOS release version from the given actual version."""
+        if require_target_macos_version is not None:
+            version = max(version, require_target_macos_version)
+        return f"{version.major}_{0 if version.major >= 11 else version.minor}"
+
     platform_tag = ".".join(
-        f"macosx_{version.major}_{version.minor}_{arch}"
+        f"macosx_{get_release_version(version)}_{arch}"
         for arch, version in arch_version.items()
     )
     return f"{prefix}-{platform_tag}.whl", problematic_libs

delocate/tests/test_scripts.py

@@ -830,15 +830,35 @@ def test_delocate_wheel_verify_name_universal2_verify_crash_env_var(
     whl_10_9 = tmp_path / "plat2-1.0-cp311-cp311-macosx_10_9_universal2.whl"
     dir2zip(tmp_path / "plat", whl_10_9)
 
+    env = os.environ.copy()
+    env["MACOSX_DEPLOYMENT_TARGET"] = "10.9"
     result = script_runner.run(
         ["delocate-wheel", whl_10_9],
         check=False,
         cwd=tmp_path,
-        env={"MACOSX_DEPLOYMENT_TARGET": "10.9"},
+        env=env,
     )
     assert result.returncode != 0
     assert "Library dependencies do not satisfy target MacOS" in result.stderr
     assert "libam1.dylib has a minimum target of 12.0" in result.stderr
     assert "module2.abi3.so has a minimum target of 11.0" not in result.stderr
     assert "MACOSX_DEPLOYMENT_TARGET=12.0" in result.stderr
     assert "--require-target-macos-version 12.0" in result.stderr
+
+
+@pytest.mark.xfail(  # type: ignore[misc]
+    sys.platform != "darwin", reason="Needs macOS linkage."
+)
+def test_delocate_wheel_macos_release_minor_version(
+    plat_wheel: PlatWheel, script_runner: ScriptRunner, tmp_path: Path
+) -> None:
+    env = os.environ.copy()
+    env["MACOSX_DEPLOYMENT_TARGET"] = "13.1"
+    script_runner.run(
+        ["delocate-wheel", plat_wheel.whl, "-vv"], env=env, check=True
+    )
+
+    # Should create a 13.0 wheel instead of the requested 13.1
+    assert {tmp_path / "plat-1.0-cp311-cp311-macosx_13_0_x86_64.whl"} == set(
+        file for file in tmp_path.iterdir() if file.suffix == ".whl"
+    )