http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46373
kargl at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |WAITING Last reconfirmed| |2010.11.08 17:05:08 CC| |kargl at gcc dot gnu.org Ever Confirmed|0 |1 --- Comment #1 from kargl at gcc dot gnu.org 2010-11-08 17:05:08 UTC --- See the documentation that comes with gfortran. You can use * GFORTRAN_UNBUFFERED_ALL:: Don't buffer I/O for all units. * GFORTRAN_UNBUFFERED_PRECONNECTED:: Don't buffer I/O for preconnected units. to control the buffering of IO.