How can I compile a program with Intel's Memory Protection Extensions (MPX) on a Mac?

I am trying to test out Intel's Memory Protection Extensions (MPX) on my Macbook Pro by mirroring this tutorial for Linux. My processor is an Intel Core i5-6267U and it does have the ability to use MPX as verified by running sysctl machdep.cpu | grep MPX. However, when I try to compile the following test program:

#include <string.h>#include <stdio.h>#include <stdlib.h>#define noinline __attribute__((noinline))char dog[] = "dog";char password[] = "secr3t";noinlinechar dog_letter(int nr){        return dog[nr];}int main(int argc, char **argv){        int max = sizeof(dog);        int i;        if (argc >= 2)                max = atoi(argv[1]);        for (i = 0; i < max; i++)                printf("dog[%d]: '%c'\n", i, dog_letter(i));        return 0;}

with the following command:

/usr/local/bin/gcc-8 -o mpx_test -fcheck-pointer-bounds -mmpx mpx_test.c

I get the following string of errors:

/var/folders/v0/g_jfwt1j0kj1cp6vjn818jjh0000gn/T//cc5F0fho.s:26:10: error: unexpected token in argument list        bnd jle L2                ^/var/folders/v0/g_jfwt1j0kj1cp6vjn818jjh0000gn/T//cc5F0fho.s:37:11: error: unexpected token in argument list        bnd call        _atoi                        ^/var/folders/v0/g_jfwt1j0kj1cp6vjn818jjh0000gn/T//cc5F0fho.s:41:10: error: unexpected token in argument list        bnd jmp L3                ^/var/folders/v0/g_jfwt1j0kj1cp6vjn818jjh0000gn/T//cc5F0fho.s:45:11: error: unexpected token in argument list        bnd call        _dog_letter                        ^/var/folders/v0/g_jfwt1j0kj1cp6vjn818jjh0000gn/T//cc5F0fho.s:57:9: error: unexpected token in argument list        bnd jl  L4                ^/var/folders/v0/g_jfwt1j0kj1cp6vjn818jjh0000gn/T//cc5F0fho.s:61:2: error: invalid instruction mnemonic 'bnd'        bnd ret        ^~~/var/folders/v0/g_jfwt1j0kj1cp6vjn818jjh0000gn/T//cc5F0fho.s:88:2: error: invalid instruction mnemonic 'bnd'        bnd ret        ^~~

If I compile with the -S flag, I can see that the assembly GCC generates does have the MPX-specific instructions (bnd...). What else do I need to do to compile the program with MPX protections?