No documentation of -rdynamic

[Wolfgang Bangerth]

Hi all,
in order for the glibc function backtrace() to return something useful, its 
documentation says one has to use the -rdynamic flag. However, as has been 
mentioned before here
  http://gcc.gnu.org/ml/gcc-help/2002-11/msg00196.html
  http://gcc.gnu.org/ml/libstdc++/2002-04/msg00100.html
and probably some other places, there doesn't seem to be any documentation of 
what this flag does etc.

Is there someone who can give me the gist of its meaning? If I get a 
reasonable explanation, I may even be willing to write a blurb for the 
manual...

Best
  Wolfgang
 
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Wolfgang Bangerth              email:            bangerth@ices.utexas.edu
                               www: http://www.ices.utexas.edu/~bangerth/