Is this casting legal?

[Chris Croswhite <csc@xxxxxxxxxxx>]

Could someone tell me how this is legal:

gcc 3.2.3 in 64b (Opteron, linux) seems not to mind,

void * foo;
(int)(word_t)foo;

Shouldn't gcc emmit a warning (as is the case of just doing a
void*->int)or an error or is this a legal cast?

TIA,
Chris