Hi!, I've been searching about possible *run-time* checks that can be used with GCC, and after a little bit of investigation I discovered about -fbounds-check, but no others... -fbounds-check only apply to Fortran compiles or they work on C/C++ too? does exist some kind of flag for testing on unitialized variables (during runtime), in my case some problems arise when somebody leaves an unintialized C++ class attribute. Thanks in advance. Miguel Angel Ajo Pelayo http://www.nbee.es +34 636 52 25 69 skype: ajoajoajo