Hi Just a warning for those who use Ubuntu and ocaml from sources (or GODI): Ubuntu 11.04 (just released) contains the GNU assembler version 2.21.0.20110327 which affects this bug in the current version of the compiler: http://caml.inria.fr/mantis/view.php?id=5237 (it will be fixed in 3.12.1) Hope I saved some of you from a painful upgrade :) Sebastien