[Gc] Segmentation fault on Mac OSX intel

[Andrea Cavalli]

Code that works on Linux-intel and Mac OSX PPC generates segmentation  
fault on
Mac OSX Intel.

GC version 6.7 compiled with options  --disable-shared --enable- 
cplusplus.

GDB stack trace:
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0xfe6a868f
0x003ac029 in gc_cleanup::cleanup ()
(gdb) bt
#0  0x003ac029 in gc_cleanup::cleanup ()
#1  0x000b6cb8 in GC_invoke_finalizers () at finalize.c:787
#2  0x000b6d5c in GC_notify_or_invoke_finalizers () at finalize.c:844
#3  0x000b77f5 in GC_generic_malloc (lb=8, k=1) at malloc.c:190
#4  0x000b7b18 in GC_malloc (lb=8) at malloc.c:333
#5  0x00bd13ee in eq_op_operator<int, int> ()
#6  0x00be0b81 in ZObj::BinaryOperator<291>::apply ()
#7  0x00be3018 in BinaryExp::eval ()
#8  0x000b04bf in WhileBlock::eval ()
#9  0x000a601b in print_exp ()
#10 0x000a082d in zeta_parse ()
#11 0x00002f02 in main ()