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Re: How to grow the Fortran I/O parameter struct and keep ABI compatibility
- From: Thomas Koenig <Thomas dot Koenig at online dot de>
- To: Jakub Jelinek <jakub at redhat dot com>
- Cc: FX Coudert <fxcoudert at gmail dot com>, "fortran at gcc dot gnu dot org List" <fortran at gcc dot gnu dot org>, GCC Development <gcc at gcc dot gnu dot org>
- Date: Tue, 7 Nov 2006 19:58:36 +0100
- Subject: Re: How to grow the Fortran I/O parameter struct and keep ABI compatibility
- References: <BF4A46F6-323D-4B41-9655-50C433228704@gmail.com> <20061107111650.GN24872@devserv.devel.redhat.com>
On Tue, Nov 07, 2006 at 06:16:50AM -0500, Jakub Jelinek wrote:
> If you want to add over time new fields, if there is space in
> common.flags, you just define a new bit there and add the new field
> to the end of u.p structure if there is space for it. That's the
> easy part.
We're having a flag day anyway, for symbol versioning. There are
numerous options to OPEN in F2003 (and possibly in other I/O
statements, I haven't checked) that we will want to implement
eventually, and which would require extra bits.
Suggestion: We should make sure we can accommodate F2003 with
4.2 and 4.3 by increasing the possible number of flags as needed.
Opinions?
Thomas