http://mail-index.netbsd.org/tech-userlevel/2009/08/thread1.html#002545
http://savannah.gnu.org/support/?106973 My conclusion so far is that "(void *)0" is a legal value for NULL (even given as an example in POSIX 2008 glossary), and that just because an expression E evaluates to an integer constant one can not assume that "sizeof E" is valid. gnulib has changed to sizeof(NULL) and I think NetBSD is going to change NULL to add the () as well (to make it less likely people will have trouble, not because the current value is wrong).
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