(autoconf.info)Null Pointers

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12.4 Properties of Null Pointers

Most modern hosts reliably fail when you attempt to dereference a null

   On almost all modern hosts, null pointers use an all-bits-zero
internal representation, so you can reliably use `memset' with 0 to set
all the pointers in an array to null values.

   If `p' is a null pointer to an object type, the C expression `p + 0'
always evaluates to `p' on modern hosts, even though the standard says
that it has undefined behavior.

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