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

[i at maskray dot me]

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

--- Comment #10 from Fangrui Song <i at maskray dot me> ---
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).

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