The behavior of most of these points are dependent on the implementation
of the C library, and are not defined by GCC itself.
The null pointer constant to which the macro NULL expands
(C90 7.1.6, C99 7.17).
In <stddef.h>, NULL expands to ((void *)0). GCC
does not provide the other headers which define NULL and some
library implementations may use other definitions in those headers.
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