Re: demos

[Petr M. <mi...@ph...>]

>>>    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'

Unfortunately, this is not portable. I've just tried a windows version 
compiled with all of the "default" #defines in makefile&config.mgw, 
including IMAGE; but its "show version long" reports only:

Compile options:
+READLINE -LIBREADLINE +GD_PNG +GD_TTF -NOCWDRC +USE_MOUSE

and thus it is not updated to options set from within config.h.
Cannot the string for the "compiled options" be concanated according to 
#define's?

---
PM