Re: [Bug-glpk] [Fwd: glpsol's --write format changed]

[Andrew Makhorin]

> -------- Forwarded Message --------
> From: Morten Welinder <address@hidden>
> To: address@hidden
> Subject: glpsol's --write format changed
> Date: Fri, 20 Jan 2017 08:18:55 -0500
> 
> It looks like the format for "glpsol --write ..." changed in Glpk
> version 4.59, a version
> described as a maintenance release.
> 
> I realise that this was probably deliberate.  Nevertheless, I would
> like you to think of
> it as a bug.
> 
> The effect of such a change is to break programs that interact with
> glpsol.  In my case,
> Gnumeric broke when some Linux distribution upgraded Glpk.
> 
> Please keep such interactions in mind for future format changes.
> 
> I note that neither the new format nor the old one contains any format
> version indication.
> Detection of format is thus inherently an ad hoc affair.
> 
> Morten Welinder
> Gnumeric maintainer
> 
> 

Thank you for your bug report.

In my defence I'd like to note that it is quite difficult to design
all aspects of the interface at once. The old format was chosen
temporarily just to provide functionality of write_sol and subsequent
read_sol, and there was no intention to use this old format for
communication between glpk and other application programs. Starting
from glpk 4.60 all api routines use so called "glpk format" (which is
a thoroughly designed unified plain text format based on dimacs format),
and I have no plans to change this format in the future.


Andrew Makhorin,
the author and maintainer of glpk