Updates for Python 3 Supportr14.0.12

The following changes have been made to support Python 3:

- in sip-tqt.h, remove the cast in the "sipConvertFromSliceObject"
  macro in versions 3.2+ as the API changed causing a compile error;
- in voidptr.h, alter the precompile conditions to remove the
  PyCObject API cals for version 3.2+ (causes runtime symbol
  resolution error) and amend the flags for "asstring";
- alter module import process in siplib.c to avoid re-loading an
  already loaded module.

Signed-off-by: aneejit1 <aneejit1@gmail.com>
Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 5b12d262dc940b6fe9e2766988917665c970318d)

1 files changed, 25 insertions, 5 deletions

diff --git a/siplib/siplib.c b/siplib/siplib.c
index d43f121..ebbc194 100644
--- a/siplib/siplib.c
+++ b/siplib/siplib.c
@@ -648,6 +648,8 @@ static int add_all_lazy_attrs(sipTypeDef *td);
 static int objectify(const char *s, PyObject **objp);
 static void add_failure(PyObject **parseErrp, sipParseFailure *failure);
 static PyObject *bad_type_str(int arg_nr, PyObject *arg);
+static sipExportedModuleDef *isModuleLoaded(sipExportedModuleDef *table,
+        char *name);
 
 
 /*
@@ -1200,12 +1202,14 @@ static int sip_api_export_module(sipExportedModuleDef *client,
         {
             PyObject *mod;
 
-            if ((mod = PyImport_ImportModule(im->im_name)) == NULL)
-                return -1;
+            em = isModuleLoaded(moduleList, im->im_name);
 
-            for (em = moduleList; em != NULL; em = em->em_next)
-                if (strcmp(sipNameOfModule(em), im->im_name) == 0)
-                    break;
+            if (em == NULL)
+            {
+                if ((mod = PyImport_ImportModule(im->im_name)) == NULL)
+                    return -1;
+                em = isModuleLoaded(moduleList, im->im_name);
+            }
 
             if (em == NULL)
             {
@@ -1277,6 +1281,22 @@ static int sip_api_export_module(sipExportedModuleDef *client,
 
 
 /*
+ * Find out if a client module has been loaded already.
+ */
+static sipExportedModuleDef *isModuleLoaded(sipExportedModuleDef *table,
+        char *name)
+{
+    sipExportedModuleDef *em = table;
+
+    for (em = moduleList; em != NULL; em = em->em_next)
+        if (strcmp(sipNameOfModule(em), name) == 0)
+            return em;
+
+    return NULL;
+}
+
+
+/*
  * Initialise the contents of a client module.  By this time anything that
  * this depends on should have been initialised.  A negative value is returned
  * and an exception raised if there was an error.