Btw, on Apple M1, here is the behavior of ulimit:
$ ulimit -a
-t: cpu time (seconds) unlimited
-f: file size (blocks) unlimited
-d: data seg size (kbytes) unlimited
-s: stack size (kbytes) 8176
-c: core file size (blocks) 0
-v: address space (kbytes) unlimited
-l: locked-in-memory size (kbytes) unlimited
-u: processes 2666
-n: file descriptors 2560
$ ulimit -s unlimited
$ ulimit -a
-t: cpu time (seconds) unlimited
-f: file size (blocks) unlimited
-d: data seg size (kbytes) unlimited
-s: stack size (kbytes) 65520
-c: core file size (blocks) 0
-v: address space (kbytes) unlimited
-l: locked-in-memory size (kbytes) unlimited
-u: processes 2666
-n: file descriptors 2560
$ ulimit -s 70000
ulimit: value exceeds hard limit
So it seems the maximum stack size that is allowed is 65520 KB ~ 64 MB.
Consequently it would seem that one cannot have larger arrays allocated on stack, but I have not tested it.