Path of dynamic link library

rosek · 04-28-2010, 01:56 PM

Hello,

I'd like to get path of one library to link it dynamicly in my program.
Probobly the best way would be to add macro to my configure.ac file, but I'm quite newbie in configure's macros. Or maybe the other solution is search for library in software ?

BR

raconteur · 04-28-2010, 04:19 PM

This is a confusing question.

I'm going to assume that you have successfully built the program and linked it.
If that isn't the case, please elaborate (but, in general, libraries are installed in standard locations and the paths to search for libraries can be specified or expanded on the compiler/linker command line, with environment variables, or makefile directives).

Otherwise, I think your question really is about determining whether the required library exists on a target installation platform.

If that is the case, the easiest way is to copy and edit an existing aclocal segment that verifies a library's existence in a configuration script.

paulsm4 · 04-28-2010, 07:17 PM

Hi -

Quote:

I'd like to get path of one library to link it dynamically in my program.

I'm not quite sure what you mean, but it probably falls under one of these three scenarios:

Quote:

1. You're building your own program, and you want to use a dynamic library.
SOLUTION: use -L in your link command
EXAMPLE: gcc -o my_exe my_obj1.o my_obj2.o -L /some/directory -lmy_sharedlib
<= in this example, the shared library would be called "libmy_sharedlib.so", and could be found in "/some/directory".

2. You're running a program that uses a shared library
SOLUTION: set the environment variable "LD_LIBRARY_PATH"
EXAMPLE: export LD_LIBRARY_PATH=/some/directory:$LD_LIBRARY_PATH

3. You have an executable, and you want to see what shared libraries it uses
SOLUTION: use "ldd"
EXAMPLE: ldd my_exe

'Hope that helps .. PSM

PS:
Raconteur - I like the Shakespeare quote