Re: gcc linking with shared library

James Kanze <>
Sun, 12 Apr 2009 04:26:15 -0700 (PDT)
On Apr 12, 5:37 am, Nick Birnie <> wrote:

I am developing a shared library and have a question about
linking some code with it.

Once I have a shared object compiled, with the .so still in
the source tree, I want to compile and link some tests with
it, without first installing the library.

If I compile the tests with the -L. and -lname switches, gcc
produces the object code, but the library is not found at run

Any idea what the problem could be?

This is very platform dependent, so you really should ask in
comp.unix.programmer, but under Posix (which I suppose because
of the .so extension), dynamic libraries are searched in the
directories in $LD_LIBRARY_PATH. I use something like the
following in my makefiles:

    runtest : $(testDependencies)
            LD_LIBRARY_PATH=..:$$LD_LIBRARY_PATH ; \
            export LD_LIBRARY_PATH ; \

(I actually use something a lot more complex, since it works
under both Windows and Unix, and it takes into account different
options, which modify where the actual test programs reside.)

James Kanze (GABI Software)
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