This patch partly (some stuff went in already) ports Python to Monterey.

- Fix bug in thread_pthread.h::PyThread_get_thread_ident() where
  sizeof(pthread) < sizeof(long).
- Add 'configure' for:
	- SIZEOF_PTHREAD is pthread_t can be included via <pthread.h>
	- setting Monterey system name
	- appropriate CC,LINKCC,LDSHARED,OPT, and CCSHARED for Monterey
- Add section in README for Monterey build

Author: Trent Mick

Python/thread_pthread.h

@@ -171,6 +171,13 @@ PyThread_start_new_thread(void (*func)(void *), void *arg)
 	return success != 0 ? 0 : 1;
 }
 
+/* XXX This implementation is considered (to quote Tim Peters) "inherently
+   hosed" because:
+     - It does not guanrantee the promise that a non-zero integer is returned.
+     - The cast to long is inherently unsafe.
+     - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
+       latter return statement (for Alpha OSF/1) are any longer necessary.
+*/
 long 
 PyThread_get_thread_ident(void)
 {
@@ -179,7 +186,11 @@ PyThread_get_thread_ident(void)
 		PyThread_init_thread();
 	/* Jump through some hoops for Alpha OSF/1 */
 	threadid = pthread_self();
+#if SIZEOF_PTHREAD_T <= SIZEOF_LONG
+	return (long) threadid;
+#else
 	return (long) *(long *) &threadid;
+#endif
 }
 
 static void 

README

@@ -307,6 +307,14 @@ OS/2:   If you are running Warp3 or Warp4 and have IBM's VisualAge C/C++
         and type NMAKE.  Threading and sockets are supported by default
         in the resulting binaries of PYTHON15.DLL and PYTHON.EXE.
 
+Monterey (64-bit AIX):
+    The current Monterey C compiler (Visual Age) uses the OBJECT_MODE={32|64}
+    environment variable to set the compilation mode to either 32-bit or
+    64-bit (32-bit mode is the default). Presumably you want 64-bit
+    compilation mode for this 64-bit OS. As a result you must first set
+    OBJECT_MODE=64 in you environment before configuring (./configure) or
+    building (make) Python on Monterey.
+
 
 Configuring threads
 -------------------

acconfig.h

@@ -157,6 +157,9 @@
 /* The number of bytes in a time_t. */
 #undef SIZEOF_TIME_T
 
+/* The number of bytes in a pthread_t. */
+#undef SIZEOF_PTHREAD_T
+
 /* Defined to enable large file support when an off_t is bigger than a long
    and long long is available and at least as big as an off_t. You may need
    to add some flags for configuration and compilation to enable this mode.

config.h.in

@@ -216,6 +216,9 @@
 /* The number of bytes in a time_t. */
 #undef SIZEOF_TIME_T
 
+/* The number of bytes in a pthread_t. */
+#undef SIZEOF_PTHREAD_T
+
 /* Defined to enable large file support when an off_t is bigger than a long
    and long long is available and at least as big as an off_t. You may need
    to add some flags for configuration and compilation to enable this mode.