bug#46256: [feature/native-comp] AOT eln files ignored if run from build tree

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: pipcet@gmail.com, 46256@debbugs.gnu.org, andrewjmoreton@gmail.com
> Date: Tue, 09 Mar 2021 13:58:31 +0000
> 
> > I think it _is_ the case, but the problem might be that the refcount
> > is not zero, and therefore the shared library is not actually unloaded
> > and unmapped.  (I say "might be" because I still don't see the
> > scenario where this could happen, and I'm not sure if it does happen
> > the solution should be as suggested -- it could be that it's better to
> > not load the .eln the second time, i.e. make 'load' behave like
> > 'require').
> 
> That was my understanding (as I don't see why dlclose should fail) but
> reading the man page:
> 
> "On success, dlclose() returns 0; on error, it returns a nonzero value."
> 
> So my understanding now is that it can fail.  Am I wrong?

I don't know.  Posix says no errors are defined for dlclose, so maybe
look at the glibc sources to see what happens on GNU/Linux?