http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061
--- Comment #16 from Ian Lance Taylor <ian at airs dot com> 2012-10-25 17:37:10 UTC --- I think you may be looking at the wrong thing. The libbacktrace configure.ac only uses GCC_CHECK_UNWIND_GETIPINFO when it is built as a target library. You are seeing a failure when building it as a host library. I don't think that changing config/unwind_ipinfo.m4 is going to make any difference for the failure that you are seeing.
