ceph/src/boost/tools/build/src/engine/boehm_gc/doc/README.rs6000

   1 We have so far failed to find a good way to determine the stack base.
   2 It is highly recommended that GC_stackbottom be set explicitly on program
   3 startup.  The supplied value sometimes causes failure under AIX 4.1, though
   4 it appears to work under 3.X.  HEURISTIC2 seems to work under 4.1, but
   5 involves a substantial performance penalty, and will fail if there is
   6 no limit on stack size.
   7
   8 There is no thread support.  (I assume recent versions of AIX provide
   9 pthreads?  I no longer have access to a machine ...)