#include <stdio.h>

struct Struct1 {
    char x;
    int y;
}  __attribute__ ((aligned (16)));

struct Struct1 tCheck;

int main()
{

    printf( "Alignment = %i\r\n",  sizeof(tCheck)  );

    return 0;
}

// G:\mingw>bin\gcc.exe align.c -o align.exe
// G:\mingw>align
// Alignment = 16