On 04/10/2012 02:38 PM, H Vlems wrote: the -l switch is clear. The static and dynamic libraries are still vague. Is the behaviour of a dynamic library similar to what VMS does when you link an object file to one of the RTL libraries? Which means it gets linked to an entry point and you can upgrade the RTL and the executable will keep working (provided the entry point is still there)? A static library's behaviour is like linking with object libraries where part of the library is copied into the resulting .exe file? Yes, basically. Code in a static library gets embedded into the executable at link time, whereas in a dynamic library, the dynamic linker pulls in the contents of the .so file and resolves all of the symbol references at run time. -Dave -- Dave McGuire, AK4HZ New Kensington, PA