test_posix.test_makedev fails on Musl systems

[kraj]

Bug report

Bug description:

This test depends on platform C library defining NODEV which is there on glibc but not on musl C library implementation on Linux. This is introduced with

#31794

Alpine has disabled portions of above patch to get it going on musl by applying this patch

diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index 7ed45ac..a35c6db 100644
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -724,7 +724,7 @@ def test_makedev(self):
             self.assertRaises((ValueError, OverflowError), posix.makedev, x, minor)
             self.assertRaises((ValueError, OverflowError), posix.makedev, major, x)

-        if sys.platform == 'linux':
+        if False:
             NODEV = -1
             self.assertEqual(posix.major(NODEV), NODEV)
             self.assertEqual(posix.minor(NODEV), NODEV)

CPython versions tested on:

3.13

Operating systems tested on:

Linux

[zware]

See gh-90548, and particularly GH-138593. This is "fixed" in 3.14 and 3.15, though I believe @serhiy-storchaka had plans to add an os.NODEV constant which could be used to properly test this rather than relying on a check for musl. We could go ahead and backport the test change to 3.13, but I'm unsure of its worth.

[kraj]

See gh-90548, and particularly GH-138593. This is "fixed" in 3.14 and 3.15, though I believe @serhiy-storchaka had plans to add an os.NODEV constant which could be used to properly test this rather than relying on a check for musl. We could go ahead and backport the test change to 3.13, but I'm unsure of its worth.

ah thanks, I will test it with 3.13 in yocto and report back.

[zware]

The change from GH-138593 is now merged on 3.13; GH-138713. I'll go ahead and close this as a duplicate of gh-90548.

[serhiy-storchaka]

though I believe @serhiy-storchaka had plans to add an os.NODEV constant which could be used to properly test this rather than relying on a check for musl.

See #138712. It does not help in testing, because what we test (functions returning NODEV) is platform-specific and cannot be reproduced on all platforms that define NODEV.