Re: Questions about "configure" and "native graphics"

[Julien Bect]

Le 21/04/2015 17:25, John W. Eaton a écrit :
> On 04/21/2015 09:59 AM, Julien Bect wrote:
> > Le 21/04/2015 15:04, Mike Miller a écrit :
> > > On Tue, Apr 21, 2015 at 08:47:21 +0200, Julien Bect wrote:
> > > > What does "native graphics" mean ?
> > > The way I understand it is a blanket term to describe both the FLTK
> > > and Qt plotting toolkits and the support libraries needed to make
> > > those work.
> >
> > Ok... So, if "native graphics" covers both FLTK and Qt, considering the
> > warnings :
> >
> > configure: WARNING: --without-fltk specified.  Native graphics will be
> > disabled.
> >
> > configure: WARNING: I didn't find the necessary libraries to compile 
> > native
> > configure: WARNING: graphics.  It isn't necessary to have native 
> > graphics,
> > configure: WARNING: but you will need to have gnuplot installed or you
> > won't
> > configure: WARNING: be able to use any of Octave's plotting commands
> >
> > shouldn't I get gnuplot only ?
>
> At one time, the only way to use OpenGL graphics was with FLTK 
> widgets, so that combination was "native graphics".  That term was 
> meant to say that plotting was done using a library directly linked 
> with Octave, not using a separate external program (gnuplot).

Thanks, it makes sense now.


> > When I configure with "--without-fltk", I still end up with both "qt"
> > and "gnuplot" available as graphics toolkits.
>
> That's what should happen.  The warning message is just bad. Please 
> feel free to suggest some better way of wording it.

Concerning the first warning:

configure: WARNING: --without-fltk specified.  Native graphics will be 
disabled.

I think that it should simply be removed, shouldn't it ?  Since "native 
graphics" are also available through the "qt" toolkit, simply using 
--without-fltk doesn't disable native graphics.


Concerning the second warning:

configure: WARNING: I didn't find the necessary libraries to compile native
configure: WARNING: graphics.  It isn't necessary to have native graphics,
configure: WARNING: but you will need to have gnuplot installed or you 
won't
configure: WARNING: be able to use any of Octave's plotting commands

if I understand correctly it is warning me that the "qt" toolkit will 
not work since I do not have some required libraries (which ones, I 
don't know yet) for native graphics.

But then, why not disable the "qt" toolkit as a consequence, instead of 
letting the build continue with it ?


> > "qt" is selected as the default toolkit but I can't plot anything
> > (figure successfully creates a frame, with various buttons and menus,
> > but everything seems frozen and I can't plot).
>
> So the libraries are present but you don't have the hardware to use 
> them?  I don't know if that's actually the case, I'm just guessing.

Well, I really don't know... Which library would that be ?