pythongh-109740: Use 't' in --disable-gil SOABI (python#109922)

Shared libraries for CPython 3.13 are now marked with a 't' for
threading. For example, `binascii.cpython-313t-darwin.so`.

Doc/library/sys.rst

@@ -22,6 +22,8 @@ always available.
 
    .. versionadded:: 3.2
 
+   .. availability:: Unix.
+
 
 .. function:: addaudithook(hook)
 

Lib/test/test_sys.py

@@ -1210,6 +1210,13 @@ def test_pystats(self):
         sys._stats_clear()
         sys._stats_dump()
 
+    @test.support.cpython_only
+    @unittest.skipUnless(hasattr(sys, 'abiflags'), 'need sys.abiflags')
+    def test_disable_gil_abi(self):
+        abi_threaded = 't' in sys.abiflags
+        py_nogil = (sysconfig.get_config_var('Py_NOGIL') == 1)
+        self.assertEqual(py_nogil, abi_threaded)
+
 
 @test.support.cpython_only
 class UnraisableHookTest(unittest.TestCase):

Misc/NEWS.d/next/Build/2023-09-26-16-00-50.gh-issue-109740.wboWdQ.rst

@@ -0,0 +1,2 @@
+The experimental ``--disable-gil`` configure flag now includes "t" (for "threaded") in
+extension ABI tags.

Python/dynload_win.c

@@ -15,10 +15,16 @@
 #define PYD_DEBUG_SUFFIX ""
 #endif
 
+#ifdef Py_NOGIL
+#  define PYD_THREADING_TAG "t"
+#else
+#  define PYD_THREADING_TAG ""
+#endif
+
 #ifdef PYD_PLATFORM_TAG
-#define PYD_TAGGED_SUFFIX PYD_DEBUG_SUFFIX ".cp" Py_STRINGIFY(PY_MAJOR_VERSION) Py_STRINGIFY(PY_MINOR_VERSION) "-" PYD_PLATFORM_TAG ".pyd"
+#define PYD_TAGGED_SUFFIX PYD_DEBUG_SUFFIX ".cp" Py_STRINGIFY(PY_MAJOR_VERSION) Py_STRINGIFY(PY_MINOR_VERSION) PYD_THREADING_TAG "-" PYD_PLATFORM_TAG ".pyd"
 #else
-#define PYD_TAGGED_SUFFIX PYD_DEBUG_SUFFIX ".cp" Py_STRINGIFY(PY_MAJOR_VERSION) Py_STRINGIFY(PY_MINOR_VERSION) ".pyd"
+#define PYD_TAGGED_SUFFIX PYD_DEBUG_SUFFIX ".cp" Py_STRINGIFY(PY_MAJOR_VERSION) Py_STRINGIFY(PY_MINOR_VERSION) PYD_THREADING_TAG ".pyd"
 #endif
 
 #define PYD_UNTAGGED_SUFFIX PYD_DEBUG_SUFFIX ".pyd"

configure.ac

@@ -1489,6 +1489,23 @@ fi
 AC_SUBST([ABIFLAGS])
 ABIFLAGS=""
 
+# Check for --disable-gil
+# --disable-gil
+AC_MSG_CHECKING([for --disable-gil])
+AC_ARG_ENABLE([gil],
+  [AS_HELP_STRING([--disable-gil], [enable experimental support for running without the GIL (default is no)])],
+  [AS_VAR_IF([enable_gil], [yes], [disable_gil=no], [disable_gil=yes])], [disable_gil=no]
+)
+AC_MSG_RESULT([$disable_gil])
+
+if test "$disable_gil" = "yes"
+then
+  AC_DEFINE([Py_NOGIL], [1],
+            [Define if you want to disable the GIL])
+  # Add "t" for "threaded"
+  ABIFLAGS="${ABIFLAGS}t"
+fi
+
 # Check for --with-pydebug
 AC_MSG_CHECKING([for --with-pydebug])
 AC_ARG_WITH([pydebug],
@@ -5669,6 +5686,7 @@ AC_C_BIGENDIAN
 #
 # * The Python implementation (always 'cpython-' for us)
 # * The major and minor version numbers
+# * --disable-gil (adds a 't')
 # * --with-pydebug (adds a 'd')
 #
 # Thus for example, Python 3.2 built with wide unicode, pydebug, and pymalloc,
@@ -6947,21 +6965,6 @@ AC_ARG_ENABLE([test-modules],
 AC_MSG_RESULT([$TEST_MODULES])
 AC_SUBST([TEST_MODULES])
 
-# Check for --disable-gil
-# --disable-gil
-AC_MSG_CHECKING([for --disable-gil])
-AC_ARG_ENABLE([gil],
-  [AS_HELP_STRING([--disable-gil], [enable experimental support for running without the GIL (default is no)])],
-  [AS_VAR_IF([enable_gil], [yes], [disable_gil=no], [disable_gil=yes])], [disable_gil=no]
-)
-AC_MSG_RESULT([$disable_gil])
-
-if test "$disable_gil" = "yes"
-then
-  AC_DEFINE([Py_NOGIL], [1],
-            [Define if you want to disable the GIL])
-fi
-
 # gh-109054: Check if -latomic is needed to get <pyatomic.h> atomic functions.
 # On Linux aarch64, GCC may require programs and libraries to be linked
 # explicitly to libatomic. Call _Py_atomic_or_uint64() which may require