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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?

Miriam
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LEARN ABOUT LINUX

ldd

LDD(1)							      General Commands Manual							    LDD(1)

NAME

       ldd - print shared library dependencies

SYNOPSIS

       ldd [OPTION]...	FILE...

DESCRIPTION

       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), ld.so(8).

								  30 October 2000							    LDD(1)