When calling a C library from a gfortran-compiled program, C stdio is only
partially written.
Ability to mix languages as needed is really important in many practical
applications these days, so this would be nice to fix. I suspect that
there is simply a missing fflush (or similar) somewhere, since the
problem appears when you have a printf with a missing newline (as in the
test case below) or when doing character-based (putc) I/O.
Environment:
System: Linux fftw.org 2.6.3-1-686-smp #2 SMP Tue Feb 24 20:29:08 EST 2004 i686
GNU/Linux
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../configure --prefix=/home/stevenj/gcc4
--enable-languages=c,f95
How-To-Repeat:
Create two files, cio.c and ciotst.f, to be compiled in gcc and gfortran:
cio.c:
#include <stdio.h>
void cio_(void){
printf("foo\n");
printf("bar\n");
printf("baz");
}
ciotst.f:
program ciotst
call cio
end
Compile:
gcc -c cio.c
gfortran ciotst.f cio.o -o ciotst
Run:
./ciotst
Output:
foo
bar
Expected output (e.g. what I get with g77):
foo
bar
baz
(Note that last line is missing a newline.)
--
Summary: cannot mix C and Fortran I/O
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: stevenj at fftw dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20179
