fix: graalpy (without added CI)

src/scikit_build_core/builder/_load_provider.py

@@ -125,7 +125,8 @@ def __iter__(self) -> Iterator[str]:
         yield from self.project
 
         # Iterate over the keys of the dynamic metadata providers
-        yield from self.providers
+        # GraalPy needs it to be a copy
+        yield from list(self.providers)
 
     def __len__(self) -> int:
         return len(self.project) + len(self.providers)

src/scikit_build_core/builder/sysconfig.py

@@ -193,12 +193,18 @@
     Return the ABI flags for the current Python interpreter. Derived from
     ``packaging.tags.sys_tags()`` since that works on Windows.
     """
-
-    most_compatible = next(iter(packaging.tags.sys_tags()))
-    full_abi = most_compatible.abi
-    vers = packaging.tags.interpreter_version()
-    abi_flags = full_abi[full_abi.find(vers) + len(vers) :]
-    return "".join(sorted(abi_flags))
+    abi_flags: str | None = sysconfig.get_config_var("ABIFLAGS")
+    if abi_flags:
+        return abi_flags
+
+    if sys.implementation.name == "cpython" and sys.platform.startswith("win32"):
+        most_compatible = next(iter(packaging.tags.sys_tags()))
+        full_abi = most_compatible.abi
+        vers = packaging.tags.interpreter_version()
+        abi_flags = full_abi[full_abi.find(vers) + len(vers) :]
+        return "".join(sorted(abi_flags))
+
+    return ""
 
 
 def info_print(

src/scikit_build_core/file_api/model/codemodel.py

@@ -94,14 +94,16 @@ class Sysroot:
 @dataclasses.dataclass(frozen=True)
 class Link:
     language: str
-    commandFragments: List[CommandFragment]
+    commandFragments: Optional[List[CommandFragment]]
     lto: Optional[bool] = None
     sysroot: Optional[Sysroot] = None
 
 
 @dataclasses.dataclass(frozen=True)
 class Archive:
-    commandFragments: List[CommandFragment] = dataclasses.field(default_factory=list)
+    commandFragments: Optional[List[CommandFragment]] = dataclasses.field(
+        default_factory=list
+    )
     lto: Optional[bool] = None
 
 

tests/test_setuptools_abi3.py

@@ -20,6 +20,9 @@
 @pytest.mark.skipif(
     sys.implementation.name == "pypy", reason="pypy does not support abi3"
 )
+@pytest.mark.skipif(
+    sys.implementation.name == "graalpy", reason="graalpy does not support abi3"
+)
 @pytest.mark.skipif(
     sysconfig.get_config_var("Py_GIL_DISABLED"),
     reason="Free-threaded Python does not support abi3",