From: Vu Ngoc San <san.vu-ngoc@ujf-grenoble.fr>
To: skaller <skaller@users.sourceforge.net>,
Caml Mailing List <caml-list@yquem.inria.fr>
Subject: Re: [Caml-list] dynamically finding libraries
Date: Thu, 15 Mar 2007 15:56:23 +0100 [thread overview]
Message-ID: <45F95E97.9010300@ujf-grenoble.fr> (raw)
In-Reply-To: <1173969084.11071.16.camel@rosella.wigram>
skaller a écrit :
> Of course there is a way to do this, but probably you shouldn't.
> Modern Linices usually have package managers, so you should
> just tell the client to install the library.
>
I like packages, but I like as well the idea of a completely relocatable
and distribution independent sotfware which could run, for instance,
from a USB pen-drive.
I first tried to write a script setting LD_LIBRARY_PATH, but I have no
idea about how to make it work with relative paths and allow symbolic links.
> Otherwise, you can write a C program that tries to call
> a function from the library, and compile, link, and run it,
> and check the result. This is a configuration time check.
>
> For a run time check, you can call dlopen() and dlsym()
> on the library and a known symbol in the library.
> If you do this, however, you will have to access ALL the
> symbols in the library with dlsym (that is, indirectly).
>
Darn. No ocaml trick for this ?
> Although Elf does allow load time lazy linkage of symbols,
> so missing symbols don't abort the program until they're
> used, there is no way I know of to have 'maybe' linkage
> of libraries. If your code is linked against a library
> the program will abort if it isn't found at run time,
> and before you get control.
>
> The best you can do is try to figure out the error code,
> and restart the program in a script that adds
> the directory containing your version in LD_LIBRARY_PATH.
>
next prev parent reply other threads:[~2007-03-15 14:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-15 13:42 Vu Ngoc San
[not found] ` <1173969084.11071.16.camel@rosella.wigram>
2007-03-15 14:56 ` Vu Ngoc San [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-03-14 22:25 Style and organization of code ian
2007-03-15 13:38 ` dynamically finding libraries Vu Ngoc San
2007-03-15 17:10 ` [Caml-list] " Eric Cooper
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