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Date: Tue, 2 Jun 2015 11:35:53 +0200
From: Szabolcs Nagy <>
Subject: Re: time.h define NULL

* Tomasz Sterna <> [2015-06-02 11:09:40 +0200]:
> Why does time.h unconditionally define NULL [1]?

because it is required

> It gives me the following warning during compilation:
> In file included from /usr/include/pthread.h:31:
> /usr/include/time.h:11:9: warning: 'NULL' macro redefined
> [-Wmacro-redefined]
> #define NULL 0L
>         ^

what is the previous definition?
and why is that conflicting?

c11 6.10.3p2:

#define A x
#define A x

is valid

#define A x
#define A y

is not.

> [1]
> -- 
>  /o__ 
> (_<^' It's better to burn out than it is to rust.

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