#include <stdio.h>
#ifdef _WIN32
#   include <intrin.h>
#   pragma pack(1)
#   define PACKED
#else
#   define PACKED  __attribute__((__packed__))
#endif

class Test
{
public:
    Test()
    {
#ifdef _WIN32
    __writeeflags(__readeflags() | 0x40000);
#else
    asm volatile("pushf \n" "pop %%rax \n" "or $0x40000, %%rax \n"
                 "push %%rax \n" "popf \n" ::: "rax");
#endif

        int *p = (int *)&mystruct;
        *p = 1;
        printf("%i\n", *p);
    }

private:
    char a;

    struct { char c1, c2; short s; } mystruct;
}
PACKED;

int main(void)
{
    new Test();

    return 0;
}