W3cubDocs

/GCC 12

4.14 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 define NULL and some library implementations may use other definitions in those headers.

© Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-12.2.0/gcc/Library-functions-implementation.html