[COFF] Fortran Question for Unix System-V r3

[Paul Winalski]

On 3/26/23, KenUnix <ken.unix.guy at gmail.com> wrote:
> Fortran question for Unix System-5 r3.
>
> When executing fortran programs requiring input the screen will
> show a blank screen. After entering input anyway the program completes
> under Unix System V *r3*.
>
> When the same program is compiled under Unix System V *r1* it
> works as expected.
>
> Sounds like on Unix System V *r3* the output buffer is not being flushed.
> I tried re-compiling F77. No help.

Re-compiling F77 doesn't help because the bug is in the Fortran
run-time library (RTL), not in the compiler.  The routine that
implements the READ statement should be flushing the write buffer
before doing the actual read.  Clearly it isn't.

Their test system probably didn't have very many (if any) tests for
interactive behavior.  That sort of thing is difficult to automate.

-Paul W.