Re: 2.19.21 core dumping bug on Fedora 22

[Colin Campbell]

On 2015-06-13 12:26 PM, Thomas Morley wrote:
> 2015-06-12 12:22 GMT+02:00 Andrew Bernard <address@hidden>:
> > > I'm not top posting
> > Lilypond 2.19.21 has had problems with the Fedora 22 release. These have
> > mostly been solved by the recent upgrade to fontconfig on that platform. I
> > have had a very difficult situation with lilypond dumping core on a very
> > complex score that I am developing, now made somewhat easier to debug by the
> > clarity provided by the bugfix just mentioned. I can finally provide a
> > snippet that deterministically and reliably dumps core with the following
> > error message:
> >
> >
> >
> > GNU LilyPond 2.19.21
> > Processing `exp-bug.ly'
> > Parsing...
> > Interpreting music...
> > Preprocessing graphical objects...
> > Finding the ideal number of pages...
> > Fitting music on 1 page...
> > Drawing systems...lilypond: ../flower/include/interval.hh:226: T
> > Interval_t<T>::center() const [with T = double]: Assertion `!is_empty ()'
> > failed.
> > Aborted (core dumped)
> >
> > Here’s the snippet from my score that produces this. The 20:3 is not an
> > error. I must point out this worked fine on previous versions of lilypond,
> > and only seems to have been introduced on 2.19.21. The platform is Fedora 22
> > but this bug also manifests on Mint 17.1.
> >
> > The precise source of the core dump is the call to \tupletOff. Commenting
> > out that line allows the code to compile.
> >
> >
> > Andrew
> >
> >
> >
> > \version "2.19.21"
> >
> > % Turn off tuplet bracket and number.
> > tupletOff = #(define-music-function (parser location) ()
> >                 #{
> >                   \once \override TupletBracket.bracket-visibility = ##f
> >                   \once \override TupletNumber.stencil = ##f
> >                 #}
> >                 )
> >
> > % Turn on tuplet bracket and number.
> > tupletOn = #(define-music-function (parser location) ()
> >                #{
> >                  \once \override TupletBracket.bracket-visibility = ##t
> >                  \revert TupletNumber.stencil
> >                #}
> >                )
> >
> >
> > treble = \relative c'' {
> >    \clef treble
> >    \time 1/4
> >
> >    \tuplet 9/8 {
> >      \stemUp
> >      \tupletOff
> >
> >      \tuplet 20/3 {
> >        a'8[( cis,) a'( cis,) a']
> >      }
> >      s32 * 6
> >    }
> > }
> >
> >
> > \score {
> >    \new Staff = "treble" { \treble }
> >
> >    \layout { }
> >
> > }
>
>
> A more concise example (taken from the NR, simplified and adding the
> stencil-override):
>
> \version "2.19.21"
>
> \relative c'' {
>    \tuplet 5/4 {
>      f8 e f
>      \once \omit TupletNumber
>      \tuplet 3/2 {
>        e[ f g]
>      }
>    }
> }
>
> Returns:
> "
> GNU LilyPond 2.19.21
> Processing `atest-27.ly'
> Parsing...
> Interpreting music...
> Preprocessing graphical objects...
> Interpreting music...
> Preprocessing graphical objects...
> Interpreting music...
> Preprocessing graphical objects...
> Finding the ideal number of pages...
> Fitting music on 1 page...
> Drawing systems...lilydevel:
> /home/gub/NewGub/gub/target/linux-64/src/lilypond-git.sv.gnu.org--lilypond.git-release-unstable/flower/include/interval.hh:226:
> T Interval_t<T>::center() const [with T = double]: Assertion
> `!is_empty ()' failed.
> Abgebrochen
> "
>
> (I always rename latest devel version to "lilydevel")
>
> Not sure whats causing it.
>
> A workaround could be to make TupletNumber transparent:
> \once \hide TupletNumber
> or setting it to point-stencil:
> \once \override TupletNumber.stencil = #point-stencil

Both pieces of code compile without error and produce reasonable output 
for me, using Frescobaldi, LilyPond 2.19.22 and KXStudio (Ubuntu 15.04).

Cheers,
Colin

--
I've learned that you shouldn't go through life with a catcher's mitt on both 
hands.
You need to be able to throw something back.
-Maya Angelou, poet (1928- )