[Bug fortran/60956] [4.8/4.9/5 Regression] error reading (and writing) large text files in gfortran

["burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60956

Tobias Burnus <burnus at gcc dot gnu.org> changed:

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--- Comment #5 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to Jerry DeLisle from comment #3)
> I took a closer look at this one. The error I am getting is running out of
> allocatable space in realloc used in fbuf.c (fbuf_alloc).  We are allocating
> one byte at a time, and just keep trying to douple the buffer when its not
> big enough.
> 
> I think we need to check for some max buffer size and when we approach it,
> flush the fbuf and continue.

I think we cannot completely get rid of buffering a complete record - if we do
formatted I/O (contrary to list-directed I/O and unformatted). The problem is
that the format can contain T, TL and TR.

However, the test case only contains list-directed I/O, which doesn't require
to cache the whole record.  [For formatted, one could check the format
statement - but there could be some performance trade off.]