Add feature macro PY_HAVE_THREAD_NATIVE_ID to the stable ABI definition (GH-32365)

Author: encukou

Doc/data/stable_abi.dat

@@ -0,0 +1,2 @@
+:c:func:`PyThread_get_thread_native_id` is excluded from the stable ABI on
+platforms where it doesn't exist (like Solaris).

Lib/test/test_stable_abi_ctypes.py

@@ -1787,6 +1787,7 @@ function PyThread_get_stacksize
 function PyThread_get_thread_ident
     added 3.2
 function PyThread_get_thread_native_id
+    ifdef PY_HAVE_THREAD_NATIVE_ID
     added 3.2
 function PyThread_init_thread
     added 3.2

Misc/NEWS.d/next/C API/2022-04-06-16-29-14.bpo-47169.wVv2bT.rst

@@ -49,8 +49,17 @@
     'MS_WINDOWS': 'on Windows',
     'HAVE_FORK': 'on platforms with fork()',
     'USE_STACKCHECK': 'on platforms with USE_STACKCHECK',
+    'PY_HAVE_THREAD_NATIVE_ID': 'on platforms with native thread IDs',
 }
 
+# To generate the DLL definition, we need to know which feature macros are
+# defined on Windows. On all platforms.
+# Best way to do that is to hardcode the list (and later test in on Windows).
+WINDOWS_IFDEFS = frozenset({
+    'MS_WINDOWS',
+    'PY_HAVE_THREAD_NATIVE_ID',
+})
+
 # The stable ABI manifest (Misc/stable_abi.txt) exists only to fill the
 # following dataclasses.
 # Feel free to change its syntax (and the `parse_manifest` function)
@@ -232,15 +241,15 @@ def sort_key(item):
 
     for item in sorted(
             manifest.select(
-                {'function'}, include_abi_only=True, ifdef={'MS_WINDOWS'}),
+                {'function'}, include_abi_only=True, ifdef=WINDOWS_IFDEFS),
             key=sort_key):
         write(f'EXPORT_FUNC({item.name})')
 
     write()
 
     for item in sorted(
             manifest.select(
-                {'data'}, include_abi_only=True, ifdef={'MS_WINDOWS'}),
+                {'data'}, include_abi_only=True, ifdef=WINDOWS_IFDEFS),
             key=sort_key):
         write(f'EXPORT_DATA({item.name})')