[lttng-dev] Broken patch for a wrapping libdl

[Matthew Khouzam]

Hello tracing arch-wizards,

I was working a bit on a trace with the cyg_profile stuff, and an issue
that would arise is when you dynamically lync a library, you don't have
it's name in the symbol tables of the executable, so you cannot nm it to
have something human readable in the callstack.

The easy solution is to wrap libdl, that way you get the handle of the
lib i dlopen, and from that you get the function name in dlsym, it also
handles seamlessly if a lib is closed, and another would replace the
addresses used.

The only problem is, it doesn't work and I don't have time to get it
working (in the short term).

I am posting this beginning idea to see if it generates any
interest/solutions.

Hope this works out,

Matthew
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