linux-kernel - Re: [patch] asm-*/posix_types.h: scrub __GLIBC_

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Date:	Wed,  2 Jan 2008 11:42:34 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Frysinger <vapier@...too.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: [patch] asm-*/posix_types.h: scrub __GLIBC__

The __GLIBC__ uses look like:

	#if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)

That block does not affect any extant glibc, so we don't care if you remove
those conditions.  Any non-glibc users of thes headers might care, since
they are the ones affected.

TGhe __USE_ALL uses are all the same one:

	typedef struct {
	#if defined(__KERNEL__) || defined(__USE_ALL)
		int	val[2];
	#else /* !defined(__KERNEL__) && !defined(__USE_ALL) */
		int	__val[2];
	#endif /* !defined(__KERNEL__) && !defined(__USE_ALL) */
	} __kernel_fsid_t;

This might matter in the case of a program compiled in strict ISO C mode,
if some ISO C-standard headers wind up including <asm/posix_types.h>.  
In ISO C it is kosher to write:

	#define val die!die!die!
	#include <stdio.h>

though this is not kosher for POSIX applications.

Thanks,
Roland
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