Help create maxSize sketch

I had:

/*
 * These were used to fill up flash to debug some issues with
 * optiboot uploads of large sketches.
 */

#define FLASH_STRING(name, str) PGM_P name = str;

#define make64bytes(a) FLASH_STRING(__flash1 ## a, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")

#define make256bytes(a) make64bytes(x ## a);     make64bytes(x1 ## a);	\
    make64bytes(x2 ## a);    make64bytes(x3 ## a)

#define make1kbytes(a) make256bytes(x1 ## a);     make256bytes(x2 ## a); \
    make256bytes(x3 ## a);     make256bytes(x4 ## a)

#define make4kbytes(a) make1kbytes(x1 ## a);     make1kbytes(x2 ## a); \
    make1kbytes(x3 ## a);     make1kbytes(x4 ## a)

#define make16kbytes(a) make4kbytes(x1 ## a);     make4kbytes(x2 ## a); \
    make4kbytes(x3 ## a);     make4kbytes(x4 ## a)

make16kbytes(foo);
make16kbytes(bar);

#if 0
make4kbytes(bar);
make256bytes(baz);
make256bytes(baz1);
make256bytes(baz2);
#endif