[Bug libfortran/43849] Add _gfortran_finalize function to close down the library

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43849

--- Comment #6 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
(In reply to Tobias Burnus from comment #0)
> Currently, _gfortran_abort calls:
>   close_units ();
> Additionally, one should call:
>   flush_all_units ();

close_units() actually flushes all units when closing then.


(In reply to Janne Blomqvist from comment #3)
> cleanup() in runtime/main.c is marked with the destructor attribute, it will be
> called when the library is unloaded during program shutdown. 
> 
> It might make sense to add 
> 
> fbuf_flush(u);
> sflush(u);

Same reply: when we close units, we do flush them. This is already ensured in
the close functions of io/unix.c.


So, to summarize: we already have a finalization function, cleanup(). Should we
export it? I am not so sure, unless we have a real use case.