gh-99337: Fix compile errors with gcc 12 on macOS (#99470)

Fix a number of compile errors with GCC-12 on macOS:

1. In pylifecycle.c the compile rejects _Pragma within a declaration
2. posixmodule.c was missing a number of ..._RUNTIME macros for non-clang on macOS
3. _ctypes assumed that __builtin_available is always present on macOS

4 files changed, 33 insertions, 2 deletions

diff --git a/Modules/_ctypes/callbacks.c b/Modules/_ctypes/callbacks.c
index 8df2f54..459632b 100644
--- a/Modules/_ctypes/callbacks.c
+++ b/Modules/_ctypes/callbacks.c
@@ -403,9 +403,15 @@ CThunkObject *_ctypes_alloc_callback(PyObject *callable,
                      "ffi_prep_cif failed with %d", result);
         goto error;
     }
+
+
 #if HAVE_FFI_PREP_CLOSURE_LOC
 #   ifdef USING_APPLE_OS_LIBFFI
+#    ifdef HAVE_BUILTIN_AVAILABLE
 #      define HAVE_FFI_PREP_CLOSURE_LOC_RUNTIME __builtin_available(macos 10.15, ios 13, watchos 6, tvos 13, *)
+#    else
+#      define HAVE_FFI_PREP_CLOSURE_LOC_RUNTIME (ffi_prep_closure_loc != NULL)
+#    endif
 #   else
 #      define HAVE_FFI_PREP_CLOSURE_LOC_RUNTIME 1
 #   endif
diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index a6c005b..28b7cd4 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -101,6 +101,7 @@
 
 #define CTYPES_CAPSULE_NAME_PYMEM "_ctypes pymem"
 
+
 static void pymem_destructor(PyObject *ptr)
 {
     void *p = PyCapsule_GetPointer(ptr, CTYPES_CAPSULE_NAME_PYMEM);
@@ -831,7 +832,11 @@ static int _call_function_pointer(int flags,
 #endif
 
 #   ifdef USING_APPLE_OS_LIBFFI
+#    ifdef HAVE_BUILTIN_AVAILABLE
 #      define HAVE_FFI_PREP_CIF_VAR_RUNTIME __builtin_available(macos 10.15, ios 13, watchos 6, tvos 13, *)
+#    else
+#      define HAVE_FFI_PREP_CIF_VAR_RUNTIME (ffi_prep_cif_var != NULL)
+#    endif
 #   elif HAVE_FFI_PREP_CIF_VAR
 #      define HAVE_FFI_PREP_CIF_VAR_RUNTIME true
 #   else
@@ -1444,8 +1449,13 @@ copy_com_pointer(PyObject *self, PyObject *args)
 #else
 #ifdef __APPLE__
 #ifdef HAVE_DYLD_SHARED_CACHE_CONTAINS_PATH
-#define HAVE_DYLD_SHARED_CACHE_CONTAINS_PATH_RUNTIME \
-    __builtin_available(macOS 11.0, iOS 14.0, tvOS 14.0, watchOS 7.0, *)
+#  ifdef HAVE_BUILTIN_AVAILABLE
+#    define HAVE_DYLD_SHARED_CACHE_CONTAINS_PATH_RUNTIME \
+        __builtin_available(macOS 11.0, iOS 14.0, tvOS 14.0, watchOS 7.0, *)
+#  else
+#    define HAVE_DYLD_SHARED_CACHE_CONTAINS_PATH_RUNTIME \
+         (_dyld_shared_cache_contains_path != NULL)
+#  endif
 #else
 // Support the deprecated case of compiling on an older macOS version
 static void *libsystem_b_handle;
diff --git a/Modules/_ctypes/ctypes.h b/Modules/_ctypes/ctypes.h
index 88eb9f5..a7029b6 100644
--- a/Modules/_ctypes/ctypes.h
+++ b/Modules/_ctypes/ctypes.h
@@ -26,6 +26,12 @@
   #endif
 #endif
 
+#if defined(__has_builtin)
+#if __has_builtin(__builtin_available)
+#define HAVE_BUILTIN_AVAILABLE 1
+#endif
+#endif
+
 typedef struct tagPyCArgObject PyCArgObject;
 typedef struct tagCDataObject CDataObject;
 typedef PyObject *(* GETFUNC)(void *, Py_ssize_t size);
diff --git a/Modules/_ctypes/malloc_closure.c b/Modules/_ctypes/malloc_closure.c
index d47153f..3a85932 100644
--- a/Modules/_ctypes/malloc_closure.c
+++ b/Modules/_ctypes/malloc_closure.c
@@ -23,6 +23,7 @@
 
 /* #define MALLOC_CLOSURE_DEBUG */ /* enable for some debugging output */
 
+
 /******************************************************************/
 
 typedef union _tagITEM {
@@ -96,7 +97,11 @@ void Py_ffi_closure_free(void *p)
 {
 #ifdef HAVE_FFI_CLOSURE_ALLOC
 #ifdef USING_APPLE_OS_LIBFFI
+# ifdef HAVE_BUILTIN_AVAILABLE
     if (__builtin_available(macos 10.15, ios 13, watchos 6, tvos 13, *)) {
+#  else
+    if (ffi_closure_free != NULL) {
+#  endif
 #endif
         ffi_closure_free(p);
         return;
@@ -114,7 +119,11 @@ void *Py_ffi_closure_alloc(size_t size, void** codeloc)
 {
 #ifdef HAVE_FFI_CLOSURE_ALLOC
 #ifdef USING_APPLE_OS_LIBFFI
+# ifdef HAVE_BUILTIN_AVAILABLE
     if (__builtin_available(macos 10.15, ios 13, watchos 6, tvos 13, *)) {
+# else
+    if (ffi_closure_alloc != NULL) {
+#  endif
 #endif
         return ffi_closure_alloc(size, codeloc);
 #ifdef USING_APPLE_OS_LIBFFI