Methods, apparatus and computer program products implement embodiments of the present invention that include replacing, in one or more initial source code files, each reference to a first function configured to convey system messages with a respective reference to a second function configured to convey the system messages, thereby producing respective corresponding preprocessed source code files for the one or more initial source code files. The respective corresponding preprocessed source code files are then compiled, thereby creating an executable file. Based on an identified name and a text string, a computed destination is determined for the text string.