The following is a test for the change I recently made to allow macros to 
continue operating even after a backtrace failure occurs.

Tested on x86-linux with linuxthreads and ia64-linux with nptl threads.

Ok to commit?

-- Jeff J.

2004-11-05  Jeff Johnston  <jjohnstn@redhat.com>

         * gdb.threads/macrothreads.exp: New test.
         * gdb.threads/macrothreads.c: New file.