GCC: visibility of symbols in standalone C++ applications -

And, (section 2.2.4 is about C ++ sections), I wonder if Required

Why Export is Needed in Standalone Applications?

P> Is "an exported symbol" a symmetry for "visual symbol"? To wit. A hidden symbol is a symbol that is not exported?

Are the object files already different between visible symbols and hidden symbols? Or is it done in the linking phase, so that only visible symbols are exported?

Is there a visibility visibility for debug info? Or is it completely free, that is, I'll get a good backtrace if I have all the symbols hidden? What is STABS / DWARF related to the visibility of symbols?

For applications you do not need this because you do not have an API ...

< P> Visibility is only relevant to shared objects.