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[Bug gas/25295] Gas should have way to define symbol version without exp
From: |
i at maskray dot me |
Subject: |
[Bug gas/25295] Gas should have way to define symbol version without exporting its target |
Date: |
Mon, 06 Apr 2020 21:54:49 +0000 |
https://sourceware.org/bugzilla/show_bug.cgi?id=25295
--- Comment #12 from Fangrui Song <i at maskray dot me> ---
(In reply to H.J. Lu from comment #11)
> (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
This just means we cannot reuse `foo`. Each non-default version requires a
fresh dummy name, e.g.
.symver foo_V1, bar@V1
.symver foo_V2, bar@V2
The rename is postponed to a very late state.
Very few (probably only 2) pieces of software actually depend on the behavior
that the original name exists in the object file.
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- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, (continued)
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hubicka at gcc dot gnu.org, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, address@hidden, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hubicka at ucw dot cz, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, marxin.liska at gmail dot com, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, address@hidden, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hjl.tools at gmail dot com, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hjl.tools at gmail dot com, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hjl.tools at gmail dot com, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, i at maskray dot me, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hjl.tools at gmail dot com, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target,
i at maskray dot me <=
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hjl.tools at gmail dot com, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hjl.tools at gmail dot com, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hjl.tools at gmail dot com, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, i at maskray dot me, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hjl.tools at gmail dot com, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hjl.tools at gmail dot com, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hjl.tools at gmail dot com, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, i at maskray dot me, 2020/04/06
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, i at maskray dot me, 2020/04/07
- [Bug gas/25295] Gas should have way to define symbol version without exporting its target, hjl.tools at gmail dot com, 2020/04/07