Fix #111033: Crash on startup when Blender path isn't UTF8 compatible

source/blender/python/generic/py_capi_utils.h

@@ -96,7 +96,11 @@ PyObject *PyC_Tuple_PackArray_Multi_Bool(const bool *array, const int dims[], in
 void PyC_Tuple_Fill(PyObject *tuple, PyObject *value);
 void PyC_List_Fill(PyObject *list, PyObject *value);
 
-/* follow http://www.python.org/dev/peps/pep-0383/ */
+/**
+ * Create a `str` from bytes in a way which is compatible with non UTF8 encoded file-system paths,
+ * see: #111033.
+ * Follow http://www.python.org/dev/peps/pep-0383/
+ */
 PyObject *PyC_UnicodeFromBytes(const char *str);
 /**
  * \param size: The length of the string: `strlen(str)`.

source/blender/python/intern/bpy.cc

@@ -641,7 +641,7 @@ void BPy_init_modules(bContext *C)
   if (modpath) {
     // printf("bpy: found module path '%s'.\n", modpath);
     PyObject *sys_path = PySys_GetObject("path"); /* borrow */
-    PyObject *py_modpath = PyUnicode_FromString(modpath);
+    PyObject *py_modpath = PyC_UnicodeFromBytes(modpath);
     PyList_Insert(sys_path, 0, py_modpath); /* add first */
     Py_DECREF(py_modpath);
   }