bugGNU Octave - Bugs: bug #49700, __have_gnuplot__ does not return...


bug #49700: __have_gnuplot__ does not return anything

Submitted by:  Guillaume <gyom>
Submitted on:  Fri 25 Nov 2016 01:37:58 PM UTC  
Category:  Plotting with gnuplot Severity:  3 - Normal
Priority:  5 - Normal Item Group:  None
Status:  Invalid Assigned to:  None
Originator Name:  Guillaume Open/Closed:  Closed
Release:  dev Operating System:  GNU/Linux

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Mon 28 Nov 2016 11:45:15 AM UTC, comment #3: 

Just to point out that I've got more insights on when this was happening: If I start a freshly compiled Octave with the GUI, _have_gnuplot_ behaves correctly, then I recompile in the background incorporating the new changes from dev and _have_gnuplot_ becomes a nohop. Nothing to worry I presume but I am reassured I was not dreaming.

Guillaume <gyom>
Fri 25 Nov 2016 04:54:21 PM UTC, comment #2: 

Complete mystery to me but I reran a freshly compiled Octave and this time _have_gnuplot_ returned something, as desired:

>> __have_gnuplot__ ()

ans = 1
>> H = __have_gnuplot__ ()

H = 1

Beforehand, I was observing this:

> __have_gnuplot__ ()
> H = __have_gnuplot__ ()
error: value on right hand side of assignment is undefined

No idea what the problem was but you can close this report for now. Sorry for the noise.

Guillaume <gyom>
Fri 25 Nov 2016 04:32:40 PM UTC, comment #1: 

Looking at the _have_gnuplot_ and have_gnuplot_binary functions in libinterp/dldfcn/__init_gnuplot__.cc, I don't see how it can ever return nothing.  If that's possible, I need more info to understand how it can happen.

John W. Eaton <jwe>
Project Administrator
Fri 25 Nov 2016 01:37:58 PM UTC, original submission:  

It might not be an issue at all but I noticed that in file .build/libinterp/dldfcn/PKG_ADD there is a line:

if (__have_gnuplot__ ()) register_graphics_toolkit ("gnuplot"); endif

which returns an error as _have_gnuplot_ returns nothing.

Guillaume <gyom>


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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2016-11-25 mtmiller StatusNeed Info => Invalid
        Open/ClosedOpen => Closed
    2016-11-25 jwe StatusNone => Need Info

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