https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89672
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
C says e.g. for memchr:
"The memchr function locates the first occurrence of c (converted to an
unsigned
char) in the initial n characters (each interpreted as unsigned char) of the
object pointed to by s."
and elsewhere:
"If a null pointer constant is converted to a pointer type, the resulting
pointer, called a null pointer, is guaranteed to compare unequal to a pointer
to any object or function."
As memchr first argument must point to an object and NULL does not point to any
object, NULL is not a valid value. It is similar to memcpy (NULL, NULL, 0) or
memset (NULL, 0, 0) etc. being invalid.
