How to debug error “Symbol lookup error: undefined symbol”

Question

I created an app (api_tests) that uses a library (libstorage.so) that linked to oracle occi library (libocci.so.12.1) and compiled it. When I run this app, I get an error:<

Answer 1

nm libocci.so.12.1

There are two problems with above command:

1. You don't know whether libocci.so.12.1 is actually getting loaded into your process. To answer the "which libocci is getting loaded", run with LD_DEBUG=libs.
2. Just because the symbol is present in the symbol table of libocci.so.12.1 doesn't mean that it's available for dynamic linking. It must be available in the dynamic symbol table, which you can examine with nm -D libocci.so.12.1