Fix py_limited_api check

Author: abravalheri

setuptools/command/bdist_wheel.py

@@ -275,19 +275,7 @@ def finalize_options(self) -> None:
             self.distribution.has_ext_modules() or self.distribution.has_c_libraries()
         )
 
-        if self.py_limited_api and 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"):
-            SetuptoolsWarning.emit(
-                summary=f"Ignoring `py_limited_api={self.py_limited_api!r}`.",
-                details="`Py_LIMITED_API` is currently incompatible with "
-                f"`Py_GIL_DISABLED` ({sys.abiflags=!r}).",
-                see_url="https://github.com/python/cpython/issues/111506",
-            )
-            self.py_limited_api = False
+        self._validate_py_limited_api()
 
         # Support legacy [wheel] section for setting universal
         wheel = self.distribution.get_option_dict("wheel")
@@ -301,6 +289,22 @@ def finalize_options(self) -> None:
         if self.build_number is not None and not self.build_number[:1].isdigit():
             raise ValueError("Build tag (build-number) must start with a digit.")
 
+    def _validate_py_limited_api(self) -> None:
+        if not self.py_limited_api:
+            return
+
+        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"):
+            SetuptoolsWarning.emit(
+                summary=f"Ignoring `py_limited_api={self.py_limited_api!r}`.",
+                details="`Py_LIMITED_API` is currently incompatible with "
+                f"`Py_GIL_DISABLED` ({sys.abiflags=!r}).",
+                see_url="https://github.com/python/cpython/issues/111506",
+            )
+            self.py_limited_api = False
+
     @property
     def wheel_dist_name(self) -> str:
         """Return distribution full name with - replaced with _"""