Casting an int pointer to a char ptr and vice versa

Question

The problem is simple. As I understand, GCC maintains that chars will be byte-aligned and ints 4-byte-aligned in a 32-bit environment. I am also aware of C99 standard 6.3.2.3 which says that casting between misaligned pointer-types results in undefined operations. What do the other standards of C say about this? There are also many experienced coders here - any view on this will be appreciated.

int *iptr1, *iptr2;
char *cptr1, *cptr2;

iptr1 = (int *) cptr1;
cptr2 = (char *) iptr2;

Solution

There are big-endian and little-endian for CPUs, so the results are undefined. For example, the value of 0x01234567 could be 0x12 or 0x67 for a char pointer after casting.