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Re: ELF extension for starting symbol search from module dependencies
- From: "Maciej W. Rozycki" <macro at ds2 dot pg dot gda dot pl>
- To: Luca Barbieri <ldb at ldb dot ods dot org>
- Cc: Debian-Devel ML <debian-devel at lists dot debian dot org>, GNU binutils ML <binutils at sources dot redhat dot com>, GNU libc ML <libc-alpha at sources dot redhat dot com>
- Date: Thu, 22 Aug 2002 10:35:33 +0200 (MET DST)
- Subject: Re: ELF extension for starting symbol search from module dependencies
- Organization: Technical University of Gdansk
- Reply-to: "Maciej W. Rozycki" <macro at ds2 dot pg dot gda dot pl>
On 21 Aug 2002, Luca Barbieri wrote:
> This is a proposal (including patches) for a GNU extension to the ELF
> executable format that adds a flag that causes the dynamic loader to
> start searching for symbols referenced by modules with the flag set from
> the module itself and its immediate dependencies. If the symbol is not
> found in this way, the dynamic linker continues the search as usual.
>
> This extension would be useful to allow to load in the same address
> space multiple libraries that define identical symbols, that would be
> used by different modules possibly unaware of each other's use of such
> symbols.
Hmm, what if two functions which get imported from different versions of
the same library operate on a static (private to the library) variable
that is needed for a proper operation for some reason? You'd better
rebuild the sources to use a single version of each library instead.
--
+ Maciej W. Rozycki, Technical University of Gdansk, Poland +
+--------------------------------------------------------------+
+ e-mail: macro@ds2.pg.gda.pl, PGP key available +