Library Functions#
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, C11 7.19).In
<stddef.h>
,NULL
expands to((void *)0)
. GCC does not provide the other headers which defineNULL
and some library implementations may use other definitions in those headers.