Date: Tue, 15 May 2001 09:46:16 +0300 From: Valentin Nechayev <netch@iv.nn.kiev.ua> To: Dima Dorfman <dima@unixfreak.org> Cc: hackers@FreeBSD.ORG, bde@FreeBSD.ORG Subject: Re: MIN()/MAX() definitions in sys/param.h Message-ID: <20010515094616.B1835@iv.nn.kiev.ua> In-Reply-To: <20010514071731.1D9F93E28@bazooka.unixfreak.org>; from dima@unixfreak.org on Mon, May 14, 2001 at 12:17:31AM -0700 References: <20010514071731.1D9F93E28@bazooka.unixfreak.org>
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Mon, May 14, 2001 at 00:17:31, dima (Dima Dorfman) wrote about "MIN()/MAX() definitions in sys/param.h":
> Is there a reason the definitions of the MIN() and MAX() macros in
> sys/param.h are under an '#ifndef _KERNEL'? Quite a few files in the
> kernel define these (well, at least MIN) themselves, so it would seem
> to make sense to define them globally in sys/param.h for the kernel as
> well. Any reason this isn't already done this way, or should I come
> up with a patch to fix that?
gcc provides safe way to implement min()/max():
=== cut from info gcc ===
#define max(a,b) \
({typedef _ta = (a), _tb = (b); \
_ta _a = (a); _tb _b = (b); \
_a > _b ? _a : _b; })
=== end cut ===
For kernel compiling you may rely on gcc and use such safe macros.
I'm unsure for the same statement about userland.
/netch
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