[Octave-bug-tracker] [bug #53091] [MXE-Octave] new warning from gnuplot

[Dan Sebald]

Follow-up Comment #6, bug #53091 (project octave):

Good point.  I didn't understand that the Octave print script didn't even
print with the change from bug #55648.

I've done


linux@ gnuplot
linux@ load 'after.gp'


and see no warning on my system.  (Perhaps warnings are directed somewhere
else on my system, but I see plenty of warnings coming from GTK+ and the usual
GUI framework, generally speaking, not from this particular Octave/gnuplot
script.)  I've replaced "Helvetica" with "Sans", "Times", "BogusFont" and see
no warnings.  The "Times" selection results in a font that does have serifs,
so at least the substitution seems to make sense. 

I don't think I'd consider this an Octave bug.  In fact, it isn't even a
gnuplot bug, as I don't see the phrase "ugly output" in the gnuplot source
tree anywhere.  I've cloned the Pango source

https://www.pango.org/Download
git clone https://gitlab.gnome.org/GNOME/pango.git

and here's where I see the phrase 'ugly output':


linux@ ~/src/pango/pango $ grep "ugly output" */*
grep: docs/xml: Is a directory
pango/pangocairo-font.c:          g_warning ("failed to create cairo %s, expect 
ugly
output. the offending font is '%s'",
pango/pango-context.c:        g_warning ("failed to choose a font, expect ugly
output. engine-type='%s', script='%s'",
pango/pangocoretext-fontmap.c:                             "weight/stretch as
fallback, expect ugly output.",
pango/pango-fontmap.c:               "expect ugly output.", ctmp1, ctmp2);
pango/pango-fontmap.c:               "expect ugly output.", ctmp1, ctmp2);
pango/pangowin32-fontmap.c:                  "expect ugly output.", ctmp1, 
ctmp2);
pango/pangowin32-fontmap.c:                  "expect ugly output.", ctmp1, 
ctmp2);
pango/shape.c:            g_warning ("shaping failure, expect ugly output.
shape-engine='%s', font='%s', text='%.*s'",


So it is a Pango warning.

Why Avinoam sees the warning and I don't, I have no idea.  A.K., when you
started seeing this warning, had you just finished a system upgrade or
something?  Perhaps a linux bundle decided to compile Pango or gnuplot in some
kind of verbose mode or something.

I've searched the Pango code for g_warning but don't see it inside a header
file, so it's definition must come glib:

https://developer.gnome.org/glib/unstable/glib-Message-Logging.html#g-warning

and I'm guessing there is some way to compile with/without warning messages
and perhaps on Avinoam's system the glib warnings are appearing somehow. 
However, I do imagine on my system there is all kinds of font substitution
going on as well.

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