llvm dev - Jun 2016 - Bug 23231 - support symbol version script / --version-script option

Hi Rui,


If you do not have active development on symbol versioning currently,

I think I can start working on this, after some more investigations.


What do you think ?


Best regards,
George.
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On 31 May 2016 at 06:47, George Rimar <grimar at accesssoftek.com>
wrote:
> Hi Rui,
>
>
> If you do not have active development on symbol versioning currently,
>
> I think I can start working on this, after some more investigations.
>
>
> What do you think ?
Right now I am pretty busy with other bugs,  so it would be really
nice to have someone working on it.

I have upload a reproducible for the freebsd libc to pr23231, where
version scripts are the current blocker. The script there is pretty
simple. It just has multiple versions and "dependencies", but no globs
other than a "local: *".

Cheers,
Rafael

George,

If you have bandwidth to work on it, please go ahead. One think I'd note is
to start with minimal implementation that is sufficient enough to read and
create versioned symbols for minimal version script file. We do not need
any wildcard pattern matching (except "local: *", but even this can be
implemented later). The initial implementation shouldn't support version
hierarchies as well.

As to algorithm, implement an algorithm that works O(n) where n is the
number of symbols in a version script file. That means you want to iterate
over symbols in a version script file instead of interating over symbols in
the linker's symbol table.

On Tue, May 31, 2016 at 6:47 AM, George Rimar <grimar at accesssoftek.com>
wrote:
> Hi Rui,
>
>
> If you do not have active development on symbol versioning currently,
>
> I think I can start working on this, after some more investigations.
>
>
> What do you think ?
>
>
> Best regards,
> George.
>
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On 1 June 2016 at 15:37, Rui Ueyama <ruiu at google.com>
wrote:
> George,
>
> If you have bandwidth to work on it, please go ahead. One think I'd
note is
> to start with minimal implementation that is sufficient enough to read and
> create versioned symbols for minimal version script file. We do not need
any
> wildcard pattern matching (except "local: *", but even this can
be
> implemented later). The initial implementation shouldn't support
version
> hierarchies as well.
>
> As to algorithm, implement an algorithm that works O(n) where n is the
> number of symbols in a version script file. That means you want to iterate
> over symbols in a version script file instead of interating over symbols in
> the linker's symbol table.
I would also skip matching version in names in the first version (@ver
and @@ver).

Cheers,
Rafael