restore ifdef with 3.12+ function

Signed-off-by: Tim Paine <3105306+timkpaine@users.noreply.github.com>

Author: timkpaine

cpp/csp/python/Common.h

@@ -4,6 +4,7 @@
 #include <Python.h>
 
 #define IS_PRE_PYTHON_3_11 (PY_MAJOR_VERSION < 3 || (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 11) )
+#define IS_PRE_PYTHON_3_12 (PY_MAJOR_VERSION < 3 || (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 12) )
 #define IS_PRE_PYTHON_3_13 (PY_MAJOR_VERSION < 3 || (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 13) )
 
 #define INIT_PYDATETIME if( !PyDateTimeAPI ) { PyDateTime_IMPORT; }

cpp/csp/python/PyNode.cpp

@@ -21,6 +21,9 @@
 #endif
 #include <internal/pycore_code.h>
 #include <internal/pycore_frame.h>
+#if !IS_PRE_PYTHON_3_13
+#    undef Py_BUILD_CORE
+#endif
 #endif
 
 namespace csp::python
@@ -88,7 +91,11 @@ void PyNode::init( PyObjectPtr inputs, PyObjectPtr outputs )
 //PY311+ changes
 #else
     _PyInterpreterFrame * frame = ( _PyInterpreterFrame * ) pygen -> gi_iframe;
+#if IS_PRE_PYTHON_3_12
+    PyCodeObject * code = frame -> f_code;
+#else
     PyCodeObject * code = PyGen_GetCode( ( PyGenObject * ) pygen );
+#endif
     int localPlusIndex = 0;
     for( int stackloc = code -> co_argcount; stackloc < code -> co_nlocalsplus; ++stackloc, ++localPlusIndex )
     {