Re: [RFC][PATCH v3 0/6] binutils patches to add DF_1_UNIQUE

["H.J. Lu" <hjl.tools@gmail.com>]

On Fri, Jun 26, 2020 at 10:38 AM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> On Fri, Jun 26, 2020 at 10:35 AM 'Fangrui Song' via Generic System V
> Application Binary Interface <generic-abi@googlegroups.com> wrote:
> >
> > On 2020-06-26, Ali Bahrami wrote:
> > >On 6/26/20 9:49 AM, H.J. Lu wrote:
> > >>>     I don't know about DF_1_UNIQUE specifically,
> > >>>but on Solaris, all 32-bits of DT_FLAGS_1
> > >>>have already been defined, so we have a conflict.
> > >>>
> > >>>Perhaps this should move to a DT_GNU_* dynamic
> > >>>entry that's part of the GNU OSABI?
> > >>>
> > >>How about DT_GNU_FLAGS_1 and DF_GNU_1_UNIQUE?
> > >
> > >
> > >   That would work for me.
> > >
> > >- Ali
> >
> > It seems that GNU specific dlmopen wants to have a libc.so/libpthread.so instance per namespace, but they need to
> > share some data structures.  (https://sourceware.org/pipermail/libc-alpha/2020-June/115139.html )
> >
> > Even on Linux, I think this is very unlikely adopted by musl.
> > It is said this flag may have something to do with LD_AUDIT.
> >
> > DT_GNU_FLAGS_1 and DF_GNU_1_UNIQUE are definitely fine.
> >
>
> I will propose to gnu-gABI:
>
>  #define DT_GNU_FLAGS_1    0x6ffffdf4
>  #define DF_GNU_1_UNIQUE   0x00000001
>

Here is the merge request to define DT_GNU_FLAGS_1 and
DF_GNU_1_UNIQUE:

https://gitlab.com/x86-psABIs/Linux-ABI/-/merge_requests/1

-- 
H.J.