Despite having the following LINK_SPEC, I am getting unrecognized
command line option '-rdynamic':
#define LINK_SPEC "%{h*} %{v:-V} %{static:-Bstatic} %{shared:-shared}
%{symbolic:-Bsymbolic} %{rdynamic:-export-dynamic}"
Any idea what else is needed to enable the command line option -rdynamic ?