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From: =?UTF-8?Q?Daniel_Cegie=C5=82ka?= <daniel.cegielka@gmail.com>
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Subject: Re: time.h define NULL
Date: Tue, 2 Jun 2015 11:38:46 +0200
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2015-06-02 11:35 GMT+02:00 Szabolcs Nagy <nsz@port70.net>:
>
> * Tomasz Sterna <tomek@xiaoka.com> [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?

http://git.musl-libc.org/cgit/musl/tree/include/stddef.h#n7



> 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] http://git.musl-libc.org/cgit/musl/tree/include/time.h#n11
> > --
> >  /o__
> > (_<^' It's better to burn out than it is to rust.