Re: modules dlopened from a library

[Gary V. Vaughan]

Hallo Simon,

Dl{pre,}opening modules from libtool libraries is a new feature of
yet-to-be-released libtool-2.0.  Please try it and report back any
problems (including insufficient documentation) to address@hidden

If you want to see example code of the feature in use, take a look
at CVS m4.

HTH,
        Gary.

Simon Richter wrote:
> Hi,
> 
> I have a shared library that internally uses plugins that are dlopened
> (or dlpreopened). For this to work, I basically have the following options:
> 
>  - Have the application load the list of preloaded symbols. This means
> that the application programmer needs to be aware that my library uses
> ltdl, and that the library will fail in Unobvious And Interesting(tm)
> ways if she forgets to do so.
> 
>  - Have the library load the list of preloaded symbols. This means that
> any application will have to define lt_preloaded_symbols, even if it is
> just a configure test application; also it introduces a dependency from
> a library to the program, which is permitted on GNU systems at the cost
> of a COW page being touched, but not very portable.
> 
>  - Have libtool add a specific .o file to every app. I'm not sure
> whether this is possible in a sane way, hence I'm asking, but to me it
> appears that if libtool could be kicked into adding a .o file to
> dependency_libs when building the library, said file would be linked to
> every application when libtool is used to link the app. This still means
> that if the application is linked without libtool, it will fail in
> U&I(tm) ways, but at least I can build a configure script that tests for
> the library's presence, and be somewhat portable.
> 
> Is there another, perhaps more sane, way to achieve this?
> 
>    Simon
> 
> 
> ------------------------------------------------------------------------
> 
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-- 
Gary V. Vaughan      ())_.  address@hidden,gnu.org}
Research Scientist   ( '/   http://tkd.kicks-ass.net
GNU Hacker           / )=   http://www.gnu.org/software/libtool
Technical Author   `(_~)_   http://sources.redhat.com/autobook