silent crash on large score - how to debug?

[Frédéric Bron]

I am currenlty finishing the transcription of the 4th symphony of
Schumann for clarinet band (open licence by the way, soon on the
internet).
The score becomes larger and I am nearly at the end (must finish by
Sunday). However, I cannot build anymore the full conductor score
because now, for some reason, lilypond 2.12.3 silently crashes after
some time of computing (roughly after 1 hour of Preprocessing
graphical objects, see log below).
It gives no message at all. I am building the score on Windows XP.
Any idea on how I can debug this?

Frédéric

PS: sources (52 ko) available here http://dl.free.fr/qANmMbGJN

Processing `conducteur.ly'
Parsing...
Interpreting music...
...
Interpreting music...
Interpreting music... [8][16][24][32][40][48][56][64][72][80][88]
warning: cannot end volta spanner
warning: cannot end volta spanner
[96][104][112][120][128][136][144][152][160][168][176][184][192][200][208][216][224][232][240][248][256][264][272][280][288][296][304][312][320][328][336][344][352][360][368][376][384][392][400][408][416][424][432][440][448][456][464][472][480][488][496][504][512][520][528][536][544][552][560][568][576][584][592][600][608][616][624][632][640][648][656][664][672]
programming error: stopped tuplet bracket has left nor right bound.
continuing, cross fingers
programming error: stopped tuplet bracket has left nor right bound.
continuing, cross fingers
[680][688][696][704][712][720][728][736][744][752][760][768][776][784][792][800]
programming error: stopped tuplet bracket has left nor right bound.
continuing, cross fingers
programming error: stopped tuplet bracket has left nor right bound.
continuing, cross fingers
[808][816][824][832]
Preprocessing graphical objects...