[metapost] Trying to figure out MPLib

[Shriramana Sharma]

Hello Taco -- I tried running your mppath demo using my recently
devised sharedlib libmplib.so and am having some problems -- hope you
can help. (I checked and the sharedlib was built from the same
[patched] sources as the staticlib which works.)

The execution halts at mppath.c line 254:

    mp_make_choices(mp, PATH_LOC(cur_exp));

I am not able to figure out beyond that. I even stepi-ed into the
program using gdb (something which I am totally inexperienced at) but
all I was able to get was:

(gdb) stepi
0x0000000000401c12      253         mp->arith_error=0;
(gdb) stepi
254         mp_make_choices(mp, PATH_LOC(cur_exp));
(gdb) stepi
0x0000000000401c20      254         mp_make_choices(mp, PATH_LOC(cur_exp));
(gdb) stepi
0x0000000000401c27      254         mp_make_choices(mp, PATH_LOC(cur_exp));
(gdb) stepi
0x0000000000401c2b      254         mp_make_choices(mp, PATH_LOC(cur_exp));
(gdb) stepi
0x0000000000401c32      254         mp_make_choices(mp, PATH_LOC(cur_exp));
(gdb) stepi
0x0000000000401c35      254         mp_make_choices(mp, PATH_LOC(cur_exp));
(gdb) stepi
0x0000000000401c38      254         mp_make_choices(mp, PATH_LOC(cur_exp));
(gdb) stepi
0x0000000000401c3c      254         mp_make_choices(mp, PATH_LOC(cur_exp));
(gdb) stepi
0x0000000000401c40      254         mp_make_choices(mp, PATH_LOC(cur_exp));
(gdb) stepi
0x0000000000401c43      254         mp_make_choices(mp, PATH_LOC(cur_exp));
(gdb) stepi

Program received signal SIGSEGV, Segmentation fault.
0x0000000000401c43 in mp_solve_path (mp=0x6041b0, first=0x60c9f0) at
mppath.c:254

-- 
Shriramana Sharma