linux-kernel - Re: [RFC][PATCH] A generic boolean (version 3)

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Date:	Sun, 23 Jul 2006 17:43:46 +0200
From:	ricknu-0@...dent.ltu.se
To:	Lars Gullik Bjønnes <larsbj@...lik.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] A generic boolean (version 3)

Citerar Lars Gullik Bjønnes <larsbj@...lik.net>:

> ricknu-0@...dent.ltu.se writes:
> 
> | --- a/include/asm-i386/types.h
> | +++ b/include/asm-i386/types.h
> | @@ -1,6 +1,13 @@
> |  #ifndef _I386_TYPES_H
> |  #define _I386_TYPES_H
> |  
> | +#if __GNUC__ >= 3
> | +typedef _Bool bool;
> | +#else
> | +#warning You compiler doesn't seem to support boolean types, will set
> 'bool' as
> | an 'unsigned int'
> | +typedef unsigned int bool;
> | +#endif
> | +
> 
> What does C99 say about sizeof(_Bool)?
> 
> At least with gcc 4 it is 1. Can that pose a problem? gcc < 3 giving a
> different size for bool?

Well, it might. I don't see it other then when someone uses a variable of
another type and the "boolean" variable (now an int) is of a larger value then
that variable. But then that is a bug and should be fixed.

But rest easy, bool will only be _Bool from now on. :)

> -- 
> 	Lgb

Richard Knutsson

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