[Bug gas/25295] Gas should have way to define symbol version without exporting its target

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25295

--- Comment #11 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Fangrui Song from comment #10)
> Thanks for CCing me. I'm interested on this topic.
> 
> I expressed my feelings on
> https://sourceware.org/pipermail/binutils/2019-November/108784.html
> and https://sourceware.org/bugzilla/show_bug.cgi?id=23840
> 
> My idea is that we should treat `.symver foo, bar@V1` as "renaming foo to
> bar@V1" (
> https://reviews.llvm.org/rL369233; This should be the same as Comment #3),
> just like what we do with the 3-@ variant `.symver foo, bar@@@V1`
> 
> https://sourceware.org/pipermail/binutils/2019-November/108784.html(In reply
> to H.J. Lu from comment #8)
> > (In reply to hubicka from comment #5)
> > > > Where do you see "export foo and foo@VERS_1"?  All I see is that the 
> > > > alias gets
> > > > the same attributes as the original symbol, thus it will be external 
> > > > iff the
> > > > original symbol is.
> > > Yes, but I want to implement only foo@VERS_1 in the unit, not foo, so I
> > > do not want to see foo in the symbol table, just foo@VERS_1 and this
> > > does not seem to be possible with current .symver
> > > (there is @@@ vairant that does that for default defs)
> > > 
> > > Honza
> > 
> > How abou
> > 
> > .symver foo, foo@VERS_1, hidden
> > 
> > It will mark foo as hidden.
> 
> I would hope we just rename the symbol (i.e. drop foo).

Rename won't work with:

.symver foo, bar@V1
.symver foo, baz@V2

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