BUG: allow $MACOSX_DEPLOYMENT_TARGET to be set to major version only

Accept version specifiers containing only the major version, for
example "11", in addition to the already supported major.minor and
major.minor.patch formats, for example "11.0" or "11.0.0".

Author: dnicolodi

mesonpy/_tags.py

@@ -109,7 +109,8 @@ def _get_macosx_platform_tag() -> str:
     # Override the macOS version if one is provided via the
     # MACOSX_DEPLOYMENT_TARGET environment variable.
     try:
-        version = tuple(map(int, os.environ.get('MACOSX_DEPLOYMENT_TARGET', '').split('.')))[:2]
+        parts = os.environ.get('MACOSX_DEPLOYMENT_TARGET', '').split('.')[:2]
+        version = tuple(map(int, parts + ['0'] * (2 - len(parts))))
     except ValueError:
         version = tuple(map(int, ver.split('.')))[:2]
 
@@ -164,7 +165,8 @@ def _get_ios_platform_tag() -> str:
     # Override the iOS version if one is provided via the
     # IPHONEOS_DEPLOYMENT_TARGET environment variable.
     try:
-        version = tuple(map(int, os.environ.get('IPHONEOS_DEPLOYMENT_TARGET', '').split('.')))[:2]
+        parts = tuple(map(int, os.environ.get('IPHONEOS_DEPLOYMENT_TARGET', '').split('.')))[:2]
+        version = tuple(map(int, parts + ['0'] * (2 - len(parts))))
     except ValueError:
         version = tuple(map(int, platform.ios_ver().release.split('.')))[:2]  # type: ignore[attr-defined]
 

tests/test_tags.py

@@ -55,6 +55,11 @@ def test_macos_platform_tag(monkeypatch):
         for minor in range(3):
             monkeypatch.setenv('MACOSX_DEPLOYMENT_TARGET', f'{major}.{minor}')
             assert next(packaging.tags.mac_platforms((major, minor))) == mesonpy._tags.get_platform_tag()
+    for major in range(11, 13):
+        monkeypatch.setenv('MACOSX_DEPLOYMENT_TARGET', f'{major}.0')
+        assert next(packaging.tags.mac_platforms((major, 0))) == mesonpy._tags.get_platform_tag()
+        monkeypatch.setenv('MACOSX_DEPLOYMENT_TARGET', f'{major}')
+        assert next(packaging.tags.mac_platforms((major, 0))) == mesonpy._tags.get_platform_tag()
 
 
 @pytest.mark.skipif(sys.platform != 'darwin', reason='macOS specific test')