How to make sure a symbol is present in the library used at run-time

[Francesco Montorsi <f18m_cpp217828 yahoo it>]

Hi,
    I need to build an app which needs a symbol from Pango library 
which exists only in some newer versions.

Since pango_version_check is not available on older pangos, and I want 
my app to run on all systems regardless of their pango version (since 
the symbol I need is not crucial), I'd like to pose the following question:

  How do I make sure that a symbol is in the Pango lib loaded at 
runtime (I want to link my app against shared libs - i.e. DSO) used at 
runtime?

I'd normally use dlopen() but given the LD_LIBRARY_PATH, RPATH and 
RUNPATH mess, how do I know for sure which lib is being used by my 
application?

The only solution I can think of is parsing the /proc/self/maps resource 
and look at it... do you know a better solution?

Thanks,
Francesco Montorsi

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