Add initial support for abi3.abi3t tag from PEP 803

pyproject.toml

@@ -95,7 +95,7 @@ doc = [
 ssl = []
 certs = []
 core = [
-	"packaging>=24.2",
+	"packaging @ git+https://github.com/ngoldbaum/packaging@abi3.abi3t",
 	"more_itertools>=8.8",
 	"jaraco.text>=3.7",
 	"importlib_metadata>=6; python_version < '3.10'",

setuptools/command/bdist_wheel.py

@@ -281,11 +281,11 @@ def _validate_py_limited_api(self) -> None:
         if not re.match(PY_LIMITED_API_PATTERN, self.py_limited_api):
             raise ValueError(f"py-limited-api must match '{PY_LIMITED_API_PATTERN}'")
 
-        if sysconfig.get_config_var("Py_GIL_DISABLED"):
+        if sysconfig.get_config_var("Py_GIL_DISABLED") and sys.version_info < (3, 15):
             raise ValueError(
                 f"`py_limited_api={self.py_limited_api!r}` not supported. "
-                "`Py_LIMITED_API` is currently incompatible with "
-                "`Py_GIL_DISABLED`. "
+                "`Py_LIMITED_API` is incompatible with `Py_GIL_DISABLED` "
+                "on Python 3.14 and older. "
                 "See https://github.com/python/cpython/issues/111506."
             )
 
@@ -300,6 +300,21 @@ def wheel_dist_name(self) -> str:
             components.append(self.build_number)
         return "-".join(components)
 
+    @property
+    def abi_tag(self) -> str:
+        impl_name = tags.interpreter_name()
+        impl_ver = tags.interpreter_version()
+        impl = impl_name + impl_ver
+        # We don't work on CPython 3.1, 3.0.
+        if self.py_limited_api and impl.startswith("cp3"):
+            if sysconfig.get_config_var("Py_GIL_DISABLED"):
+                abi_tag = "abi3.abi3t"
+            else:
+                abi_tag = "abi3"
+        else:
+            abi_tag = str(get_abi_tag()).lower()
+        return abi_tag
+
     def get_tag(self) -> tuple[str, str, str]:
         # bdist sets self.plat_name if unset, we should only use it for purepy
         # wheels if the user supplied it.
@@ -342,20 +357,19 @@ def get_tag(self) -> tuple[str, str, str]:
             impl_name = tags.interpreter_name()
             impl_ver = tags.interpreter_version()
             impl = impl_name + impl_ver
-            # We don't work on CPython 3.1, 3.0.
-            if self.py_limited_api and (impl_name + impl_ver).startswith("cp3"):
+            abi_tag = self.abi_tag
+            if "abi3" in abi_tag:
+                assert self.py_limited_api is not False
                 impl = self.py_limited_api
-                abi_tag = "abi3"
-            else:
-                abi_tag = str(get_abi_tag()).lower()
             tag = (impl, abi_tag, plat_name)
             # issue gh-374: allow overriding plat_name
             supported_tags = [
                 (t.interpreter, t.abi, plat_name) for t in tags.sys_tags()
             ]
-            assert tag in supported_tags, (
-                f"would build wheel with unsupported tag {tag}"
-            )
+            assert any(
+                (t.interpreter, t.abi, plat_name) in supported_tags
+                for t in tags.parse_tag("-".join(tag))
+            ), f"would build wheel with unsupported tag {tag}"
         return tag
 
     def run(self):