[Bug fortran/34327] Is screen output buffered when gfortran is run in a MinGW shell?

[burnus at gcc dot gnu dot org]

------- Comment #1 from burnus at gcc dot gnu dot org  2007-12-03 19:00 -------
> Is screen output buffered when gfortran

Generally, gfortran buffers output. (Or more precisely, it lets the C library
do the buffering.) Seemingly, in the MinGW shell there is more buffering.

> PRINT *, "In the MinGW shell you will not see this prompt until after the
> READ"

Add here a
  call flush()  ! GNU extension; "call flush(6)" is also possible
or
  flush(<unit>) ! Fortran 2003 syntax
where <unit> is "6" or with "use iso_fortran_env" "OUTPUT_UNIT".

This will ensure that the string is always shown, regardless how the buffering
works.

Alternatively, you can set the environment variables
  GFORTRAN_UNBUFFERED_PRECONNECTED=y
or
  GFORTRAN_UNBUFFERED_ALL=y


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34327