How to get more info if lt_dlopen fails?

Question

I'm calling lt_dlopen and getting a generic file not found error (translated errno text). How can I get more information about what is actually failing, as the file is definitely there.

This is a C++ program loading a C++ library. Otherwhere in the same program I use the same command to open other libraries without a problem, thus I fear it might be something specific to this library. I've used ldd and all those dependencies of the library are met.

Answer 1

I stumbled across something that kind of works:

export LD_DEBUG=all

And then proceed to sift throught the extreme mass of output. In this case I found a "lookup error" and one of the symbols could not be resolved. I'm not sure why, but that is perhaps not relevant to this question.