[fpc-other] How to set library search path ?

[Fred van Stappen]

Wow, many thanks Silvio.


OK, your demo works.


But what about if liba has dependencies with no path defined:


--->  handle = dlopen("../libb/libb.so", RTLD_LAZY); ---> ok it works but the path was defined.


But if no path was defined, IMO it will work only if libb.so is in /usr/lib/ or usr/local/lib.


And that is the case of many libraries. There is no path defined for the dependencies.


And it is the challenge, how to define a different path than /usr/lib/ or usr/local/lib.


Many thanks.


Fre;D


________________________________
De : fpc-other <fpc-other-bounces at lists.freepascal.org> de la part de silvioprog <silvioprog at gmail.com>
Envoyé : lundi 13 mars 2017 17:10
À : Other FPC related discussions
Objet : Re: [fpc-other] How to set library search path ?

On Mon, Mar 13, 2017 at 12:19 PM, silvioprog <silvioprog at gmail.com<mailto:silvioprog at gmail.com>> wrote:
On Mon, Mar 13, 2017 at 8:04 AM, Fred van Stappen <fiens at hotmail.com<mailto:fiens at hotmail.com>> wrote:

Hello and thanks to Silvio, z505, Giuliano.
[...]
And this is the challenge, how to load that dependeny if they are not in the lib-system directory.

Strange. I'm using loadlibrary/dlsym and both works properly here. o.O Could you test the attached example? See its result on my Linux:

$ make
Free Pascal Compiler version 3.1.1 [2017/03/12] for x86_64
Copyright (c) 1993-2017 by Florian Klaempfl and others
Target OS: Linux for x86-64
Compiling test/test.pp
Linking test/test
38 lines compiled, 0.1 sec

$ make test
I'm lib A
I'm lib B

Example II (using both loadlibrary and dlsym):

- fpc loads liba/liba and calls their funcs;
- liba loads dep libb and calls its func;
- libb loads dep liba and calls its func.

Result:

$ make test
I'm lib A
a.dep: I'm lib B
I'm lib B
b.dep: I'm lib A

I think this test above simulates a plugin/module dependence environment. :-)

--
Silvio Clécio
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