https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19852
--- Comment #8 from yjf.victor at foxmail dot com ---
It seems that the stack size is unlimited.
```
% limit
cputime unlimited
filesize unlimited
datasize unlimited
stacksize unlimited
coredumpsize unlimited
vmemoryuse unlimited
descriptors 1024
% limit -h
cputime unlimited
filesize unlimited
datasize unlimited
stacksize unlimited
coredumpsize unlimited
vmemoryuse unlimited
descriptors 1024
```
However, it fails at `alloca()` when it only try to allocate `31 *
sizeof(struct mode_data *)` bytes of memory.
```
Breakpoint 1, _Z15calc_wider_modev ()
at /dev/fs/E/22/gcc/gcc-5.5.0/gcc/genmodes.c:851
851 sortbuf = XALLOCAVEC (struct mode_data *, max_n_modes + 1);
(gdb) p max_n_modes
$1 = 31
(gdb) n
Program received signal SIGSEGV, Segmentation fault.
0x0083ff7a in ?? ()
(gdb)
```
