From owner-freebsd-arch  Thu Jan 23 20:34:48 2003
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Date: Fri, 24 Jan 2003 15:36:28 +1100 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Mike Barcroft <mike@FreeBSD.ORG>
Cc: Ben Mesander <ben@timing.com>,
	Warner Losh <imp@harmony.village.org>,
	Daniel Eischen <eischen@pcnet1.pcnet.com>, <freebsd-arch@FreeBSD.ORG>
Subject: Re: _REENTRANT in math.h & libm oddities.
In-Reply-To: <20030123170330.A32279@espresso.q9media.com>
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On Thu, 23 Jan 2003, Mike Barcroft wrote:

> Ben Mesander <ben@timing.com> writes:
> > Ben Mesander writes:
> >  > But even so, I disagree that the _r function definitions should only
> >  > appear in math.h if _REENTRANT is defined. That is, I disagree unless
> >  > the POSIX specification says otherwise; I've been surprised by it
> >  > before. I was unaware that POSIX mentioned _REENTRANT.
> >
> > The folks on freebsd-standards said that the defns for the threadsafe
> > gamma funcs should be in the BSD namespace (__BSD_VISIBLE).
>
> I've only been eyeballing this and the other thread, but I think the
> conditional we're looking for is:
>
> #if defined(__BSD_VISIBLE) || (defined(__POSIX_VISIBLE) && defined(_REENTRANT))
>
> This provides the reentrant functions in the unencumbered (no standard
> specified) namespace and in the POSIX namespace when requested.

The gamma_r functions are not in POSIX and neither is _REENTRANT, so
the correct conditional is just:

#if defined(__BSD_VISIBLE)

(unless we add conditions to support Sun standards).

Bruce


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