ARGH! Segmentation fault

[jmp115]

Hi,

I'm currently trying to write a new feature to automatically decide how to 
engrave choral scores. Basically it takes a list of parts and generates 
staves with various combinations of those parts (e.g. a Soprano and Alto 
staff, as well as separate Soprano and Alto staves). It then steps through 
each part and works out, at each moment, which combination gives the most 
readable output (c.f. make-part-combine-music generation of split-list).

A Choral_group_iterator (based on Part_combine_iterator) creates these 
staves in a ChoirStaff context and sends ChoralGroupCostEvent events to a 
Choral_group_engraver. This creates a dummy Item (a ChoralGroupCost) which 
is acked by a Choral_group_spanner_engraver (based on 
Hara_kiri_group_engraver).

The Choral_group_spanner_engraver works like Hara_kiri_group_engraver and 
creates a ChoralVerticalGroup spanner which kills itself if the costs it 
receives convince it to.

Everything up to and including the iterator works fine. When I test the 
rest, make fails. It makes the lilypond bin OK, but fails when doing 
lilypond generate-documention.

A GDB backtrace on a test run gives:

----------------------- Program received signal SIGSEGV, Segmentation 
fault. 0x4021357d in scm_mark_subr_table () from /usr/lib/libguile.so.12 
(gdb) bt #0 0x4021357d in scm_mark_subr_table () from 
/usr/lib/libguile.so.12 #1 0x401ebd86 in scm_igc () from 
/usr/lib/libguile.so.12 #2 0x401ecd6b in scm_gc_sweep () from 
/usr/lib/libguile.so.12 #3 0x401eceba in scm_must_realloc () from 
/usr/lib/libguile.so.12 #4 0x4021333e in scm_c_make_subr () from 
/usr/lib/libguile.so.12 #5 0x401f7fa3 in scm_init_goops () from 
/usr/lib/libguile.so.12 #6 0x401f8215 in scm_c_define_gsubr () from 
/usr/lib/libguile.so.12 #7 0x08199c7e in 
Volta_bracket_interface_print_init_functions() () at volta-bracket.cc:32 #8 
0x080cf7ce in ly_init_ly_module(void*) () at lily-guile.cc:196 #9 
0x401e9ccc in scm_c_with_fluids () from /usr/lib/libguile.so.12 #10 
0x401e9d99 in scm_c_with_fluid () from /usr/lib/libguile.so.12 #11 
0x40201587 in scm_c_call_with_current_module () from 
/usr/lib/libguile.so.12 #12 0x40201701 in scm_c_define_module () from 
/usr/lib/libguile.so.12 #13 0x080cf876 in ly_c_init_guile() () at 
lily-guile.cc:216 #14 0x080e5a58 in main_with_guile () at main.cc:356 #15 
0x401fbfbf in scm_init_guile () from /usr/lib/libguile.so.12 #16 0x401fbf7e 
in scm_init_guile () from /usr/lib/libguile.so.12 #17 0x401fbc50 in 
scm_boot_guile () from /usr/lib/libguile.so.12 #18 0x080e6904 in main 
(argc=2, argv=0xbffff7f4) at main.cc:529 #19 0x403d2d06 in 
__libc_start_main () from /lib/libc.so.6 
----------------------------------------------

If I comment out the MAKE_SCHEME_CALLBACK lines in my 
choral-group-spanner.cc then I don't get this error (though make still 
fails as scheme cannot find my callbacks!). The error also disappears if I 
keep these lines in choral-group-spanner.cc but remove them from 
hara-kiri-group-spanner.cc.

Is there a limit to the number of scm_init_funcs_ (when it exceeds around 
500 it seems to fail)? Is there some other problem (see also the attached 
files)?

Mark

choral-group-spanner.cc
Description: choral-group-spanner.cc

axis-group-engraver.cc
Description: axis-group-engraver.cc