@@ -81,6 +81,15 @@ Other language changes
   they reference) alive indefinitely.
   (Contributed by Łukasz Langa in :gh:`102960`.)
 
+* Stable ABI extensions may now include a multiarch tuple in the
+  filename, e.g. ``foo.abi3-x86-64-linux-gnu.so``.
+  This permits stable ABI extensions for multiple architectures to be
+  co-installed into the same directory, without clashing with each
+  other, as regular dynamic extensions do. Build tools will not generate
+  these multiarch tagged filenames, by default, while still supporting
+  older Python versions that don't recognize these filenames.
+  (Contributed by Stefano Rivera in :gh:`122931`.)
+
 
 New modules
 ===========
 
@@ -0,0 +1,2 @@
+Allow importing stable ABI C extensions that include a multiarch tuple
+in their filename, e.g. ``foo.abi3-x86-64-linux-gnu.so``.
@@ -47,8 +47,14 @@ const char *_PyImport_DynLoadFiletab[] = {
 #endif
 #ifndef Py_GIL_DISABLED
     ".abi" PYTHON_ABI_STRING ".so",
+#ifdef SOABI_PLATFORM
+    ".abi" PYTHON_ABI_STRING "-" SOABI_PLATFORM ".so",
+#endif  /* SOABI_PLATFORM */
 #endif  /* Py_GIL_DISABLED */
     ".abi" PYTHON_ABI_STRING "t.so",
+#ifdef SOABI_PLATFORM
+    ".abi" PYTHON_ABI_STRING "t-" SOABI_PLATFORM ".so",
+#endif  /* SOABI_PLATFORM */
     ".so",
 #endif  /* __CYGWIN__ */
     NULL,
 
@@ -1212,6 +1212,8 @@ AS_CASE([$ac_sys_system],
   [SOABI_PLATFORM=$PLATFORM_TRIPLET]
 )
 
+AC_DEFINE_UNQUOTED([SOABI_PLATFORM], ["${SOABI_PLATFORM}"], [Platform tag, used in binary module extension filenames.])
+
 if test x$MULTIARCH != x; then
   MULTIARCH_CPPFLAGS="-DMULTIARCH=\\\"$MULTIARCH\\\""
 fi
 
@@ -1938,6 +1938,9 @@
 /* The size of '_Bool', as computed by sizeof. */
 #undef SIZEOF__BOOL
 
+/* Platform tag, used in binary module extension filenames. */
+#undef SOABI_PLATFORM
+
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+Allow importing stable ABI C extensions that include a multiarch tuple`
	`2`	+in their filename, e.g. ``foo.abi3-x86-64-linux-gnu.so``.
Original file line number	Diff line number	Diff line change
`@@ -1212,6 +1212,8 @@ AS_CASE([$ac_sys_system],`
`1212`	`1212`	`[SOABI_PLATFORM=$PLATFORM_TRIPLET]`
`1213`	`1213`	`)`
`1214`	`1214`
	`1215`	`+AC_DEFINE_UNQUOTED([SOABI_PLATFORM], ["${SOABI_PLATFORM}"], [Platform tag, used in binary module extension filenames.])`
	`1216`	`+`
`1215`	`1217`	`if test x$MULTIARCH != x; then`
`1216`	`1218`	`MULTIARCH_CPPFLAGS="-DMULTIARCH=\\\"$MULTIARCH\\\""`
`1217`	`1219`	`fi`