Compiler bug

[Joaquim Martillo]

extern int usr1(), usr2(), usr3();

int usrprocs[] = { usr1, usr2, usr3 };

Should not compile (with compiler errors not liner errors) since you
have an illegal combination of pointers and integers.  The proper
way to do this is:

extern int usr1(), usr2(), usr3();

int (*(usrprocs[]))() = { usr1, usr2, usr3 };

which should be fairly obvious if you think about it.  There are of
course misimplementations of the C compiler floating around.