cast to larger data type on 32bits, probably fixes #809

datastore.cpp

@@ -160,7 +160,7 @@ int main( const int argc, const char * argv[] ) {
  shared_layout_ptr->ram_index_file_name
  );
  // add zero termination
- unsigned end_of_string_index = std::min(1023ul, file_index_file_name.length());
+ unsigned end_of_string_index = std::min((std::size_t)1023, file_index_file_name.length());
  shared_layout_ptr->ram_index_file_name[end_of_string_index] = '\0';
 
  // collect number of elements to store in shared memory object