Keep .abi3t.so, as requested by the SC

Author: stefanor

Lib/test/test_importlib/extension/test_finder.py

@@ -75,8 +75,7 @@ def test_abi3_extension_suffixes(self):
                 self.assertIn(".abi3.so", suffixes)
             if platform:
                 self.assertIn(f".abi3t-{platform}.so", suffixes)
-            else:
-                self.assertIn(".abi3t.so", suffixes)
+            self.assertIn(".abi3t.so", suffixes)
 
 
 (Frozen_FinderTests,

Misc/NEWS.d/next/C_API/2024-08-12-09-48-04.gh-issue-122931.QwHc2l.rst

@@ -1 +1 @@
-Linux: Include multiarch tuples in ``abi3t`` stable ABI C extension filenames, e.g. ``foo.abi3t-x86-64-linux-gnu.so``.
+Linux: Include multiarch tuples in ``abi3t`` stable ABI C extension filenames, e.g. ``foo.abi3t-x86-64-linux-gnu.so``, by default.

Python/dynload_shlib.c

@@ -50,9 +50,8 @@ const char *_PyImport_DynLoadFiletab[] = {
 #endif  /* Py_GIL_DISABLED */
 #ifdef SOABI_PLATFORM
     ".abi" PYTHON_ABI_STRING "t-" SOABI_PLATFORM ".so",
-#else
-    ".abi" PYTHON_ABI_STRING "t.so",
 #endif  /* SOABI_PLATFORM */
+    ".abi" PYTHON_ABI_STRING "t.so",
     ".so",
 #endif  /* __CYGWIN__ */
     NULL,