@PeteBecker • Without knowing how it was compiled, on what platform, with which compiler, and the intent of the OP, I don't know. We have a dearth of information, and the OP doesn't seem to be interested in their question. Maybe the OP is making new programs, but compiling all the source together,
g++ *.cpp
(which has been an issue some new programmers have asked on SO before). —
Eljay 48 secs ago