Re: demos

[Ethan A M. <merritt@u.washington.edu>]

On Thursday 03 August 2006 12:56 pm, Daniel J Sebald wrote:
> >    if (!strstrt(GPVAL_COMPILE_OPTIONS,"-IMAGE")) load "image.dem"
> No, that would mean not "way backward" compatible because "image.dem" 
> would still be run on older versions of gnuplot... 

Not a problem.  Here's a variant that checks for version compatibility:

 if (GPVAL_VERSION == 4.1 && strstrt(GPVAL_COMPILE_OPTIONS,"+IMAGE")) \
     load 'image.dem'

Of course, this requires that string variables are configure in
(now the default). But it you want it even more foolproof then use

 if (defined(GPVAL_COMPILE_OPTIONS)) \
 if (GPVAL_VERSION == 4.1 && strstrt(GPVAL_COMPILE_OPTIONS,"+IMAGE")) \
     load 'image.dem'
 
That is safe even in the absence of string variables (although
it doesn't actually run the demo).

I've put such on SourceForge.  Please have a look.
It's pretty non-intrusive (all it does is add a new GPVAL_*** variable),
and it will allow us to protect all the configuration-dependent demos
in all.dem that are run by "make check".

-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742