TST: temp skip of extending tests

* Temporarily skip the tests flagged in scipygh-22039
on free-threaded Windows CPython. Note that free-threading
itself may be a red herring here, and the issue may ultimately
be some combination of the disabling of build isolation
for free-threaded wheels compounded with the Windows platform.

* Note that the error messages reported by these test meson
builds are identical to those reported by in-place builds
of SciPy, for which we already have skips on these tests.
Even for the case of the in-place build test failure,
which simplifies down to a single-line reproducer, `cimport scipy.linalg`,
we still don't have a work around, so it seems like we may
not want to hold up the release candidate for an even more
challenging-to-reproduce scenario that has the same error message.
Also, if there were fundamental issues with free threading
on this platform/Python combination, they would presumably
show up somewhere other than just these in-place-sensitive
tests.

[skip circle] [skip cirrus]

Author: tylerjereddy

scipy/linalg/tests/test_extending.py

@@ -1,5 +1,6 @@
 import os
 import platform
+import sysconfig
 
 import numpy as np
 import pytest
@@ -13,6 +14,9 @@
 # essential per https://github.com/scipy/scipy/pull/20487#discussion_r1567057247
 @pytest.mark.skipif(IS_EDITABLE,
                     reason='Editable install cannot find .pxd headers.')
+@pytest.mark.skipif((platform.system() == 'Windows' and
+                     sysconfig.get_config_var('Py_GIL_DISABLED')),
+                    reason='gh-22039')
 @pytest.mark.skipif(platform.machine() in ["wasm32", "wasm64"],
                     reason="Can't start subprocess")
 @pytest.mark.skipif(cython is None, reason="requires cython")

scipy/optimize/tests/test_extending.py

@@ -1,5 +1,6 @@
 import os
 import platform
+import sysconfig
 
 import pytest
 
@@ -10,6 +11,9 @@
 # essential per https://github.com/scipy/scipy/pull/20487#discussion_r1567057247
 @pytest.mark.skipif(IS_EDITABLE,
                     reason='Editable install cannot find .pxd headers.')
+@pytest.mark.skipif((platform.system() == 'Windows' and
+                     sysconfig.get_config_var('Py_GIL_DISABLED')),
+                    reason='gh-22039')
 @pytest.mark.skipif(platform.machine() in ["wasm32", "wasm64"],
                     reason="Can't start subprocess")
 @pytest.mark.skipif(cython is None, reason="requires cython")

scipy/special/tests/test_extending.py

@@ -1,5 +1,6 @@
 import os
 import platform
+import sysconfig
 
 import pytest
 
@@ -11,6 +12,9 @@
 # essential per https://github.com/scipy/scipy/pull/20487#discussion_r1567057247
 @pytest.mark.skipif(IS_EDITABLE,
                     reason='Editable install cannot find .pxd headers.')
+@pytest.mark.skipif((platform.system() == 'Windows' and
+                     sysconfig.get_config_var('Py_GIL_DISABLED')),
+                    reason='gh-22039')
 @pytest.mark.skipif(platform.machine() in ["wasm32", "wasm64"],
                     reason="Can't start subprocess")
 @pytest.mark.skipif(cython is None, reason="requires cython")