Shared libraries

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Old 11-12-2001
Shared libraries

Hello everybody,

I am having major problems at the moment with shared libraries and I have to little knowledge of them to solve them. So please, please help me Smilie

Ok this is the problem:

I have a library A, which uses B and C, and C uses again D.

If I try to run A as plugin in apache, it says C doesn't find D ( unresolved, etc).

I have the suspission that it has to do with the way we make our stuff. We use omake. I can change the compiler "severity" of it, due to a lot of problems I will rather not explain here. The thing is that someone stated it would be enough to put all the -l<lib> options on higher level.

So in my example this would mean that the makefile of libA contains the following options :-lB -lC -lD, and the other makefiles didn't need references to the libs they are using.

But that doesn't seem to work. Lib C still complains about unresolves ( but only runtime!! ), although the file is there and in the LD_LIBRARY_PATH.

Does someone have a good article, or some hints for me, how to compile the .so files so they will run without unresolves? Where should I include the -l options?

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LDD(1)							      General Commands Manual							    LDD(1)

ldd - print shared library dependencies SYNOPSIS
ldd prints the shared libraries required by each program or shared library specified on the command line. OPTIONS
--version Print the version number of ldd. -v --verbose Print all information, including e.g. symbol versioning information. -d --data-relocs Perform relocations and report any missing objects (ELF only). -r --function-relocs Perform relocations for both data objects and functions, and report any missing objects or functions (ELF only). -u --unused Print unused direct dependencies. --help Usage information. BUGS
ldd does not work on a.out shared libraries. ldd does not work with some extremely old a.out programs which were built before ldd support was added to the compiler releases. If you use ldd on one of these programs, the program will attempt to run with argc = 0 and the results will be unpredictable. AUTHOR
Roland McGrath and Ulrich Drepper. SEE ALSO
ldconfig(8), 30 October 2000 LDD(1)