#include <stdio.h>
#include <stdlib.h>
#include <alloca.h>

void foo_alloca(size_t s);
void foo_vla(size_t s);

int
main(int argc, char* argv[])
{
    size_t s = 1024 * 1024 * 1024;

    foo_vla(s);
    foo_alloca(s);

    return 0;
}

void
foo_alloca(size_t s)
{
    size_t j;
    int* i = (int *) alloca(s);

    for (j = 0; j < s; j++)
        i[j] = j;
}

void
foo_vla(size_t s)
{
    size_t j;
    int i[s];

    for (j = 0; j < s; j++)
        i[j] = j;
}