http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46373
Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jvdelisle at gcc dot | |gnu.org --- Comment #2 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> 2010-11-08 17:47:14 UTC --- An internal unit fflush is: static int mem_flush (unix_stream * s __attribute__ ((unused))) { return 0; } So I don't think this is your issue. Maybe something else?