Date: Thu, 2 Feb 2006 23:01:00 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: "O. Hartmann" <ohartman@uni-mainz.de> Cc: "O. Hartmann" <ohartman@mail.uni-mainz.de>, freebsd-stable@FreeBSD.org, freebsd-amd64@FreeBSD.org Subject: Re: missing fpresetsticky in ieeefp.h Message-ID: <20060202224815.K7234@delplex.bde.org> In-Reply-To: <43E1E8B0.3030702@uni-mainz.de> References: <43E1D1E9.3000302@mail.uni-mainz.de> <43E1E8B0.3030702@uni-mainz.de>
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On Thu, 2 Feb 2006, O. Hartmann wrote:
> O. Hartmann schrieb:
>> Hello.
>> I do not know whether this should be a bug report or not, I will ask prior
>> to any further action.
>>
>> Reading 'man fpresetsticky' show up a man page for FPGETROUND(3) and tells
>> me the existence of the fpresetsticky routine.
This is a bug in the man page. fpresetsticky() is supposed to only exist
on i386's, but the man page and its link to fpresetsticky.3 are installed
for all arches.
>> Now take a look into <machine/ieeefp.h>, where this function should be
>> declared. Nothing, I can not find this routine, it seems to be 'not
>> available' on my FreeBSD6.1-PRERELEASE AMD64 (no 32Bit compatibility).
It was removed for amd64 and never existed for some other arches. It was
apparently unused when it was removed a year ago.
>> Background is, I try to compile GMT 4.1 and ran into this problem again (I
>> reveal this error since FBSD 5.4-PRE also on i386).
>>
>> If fpresetsticky() isn't available on amd64 anymore, it shouldn't be
>> mentioned in the manpage. But it seems to me to be a bug, so somebody
>> should confirm this.
% RCS file: /home/ncvs/src/sys/amd64/include/ieeefp.h,v
% Working file: ieeefp.h
% head: 1.14
% ...
% ----------------------------
% revision 1.13
% date: 2005/03/15 15:53:39; author: das; state: Exp; lines: +0 -20
% Remove fpsetsticky(). This was added for SysV compatibility, but due
% to mistakes from day 1, it has always had semantics inconsistent with
% SVR4 and its successors. In particular, given argument M:
%
% - On Solaris and FreeBSD/{alpha,sparc64}, it clobbers the old flags
% and *sets* the new flag word to M. (NetBSD, too?)
% - On FreeBSD/{amd64,i386}, it *clears* the flags that are specified in M
% and leaves the remaining flags unchanged (modulo a small bug on amd64.)
% - On FreeBSD/ia64, it is not implemented.
%
% There is no way to fix fpsetsticky() to DTRT for both old FreeBSD apps
% and apps ported from other operating systems, so the best approach
% seems to be to kill the function and fix any apps that break. I
% couldn't find any ports that use it, and any such ports would already
% be broken on FreeBSD/ia64 and Linux anyway.
%
% By the way, the routine has always been undocumented in FreeBSD,
% except for an MLINK to a manpage that doesn't describe it. This
% manpage has stated since 5.3-RELEASE that the functions it describes
% are deprecated, so that must mean that functions that it is *supposed*
% to describe but doesn't are even *more* deprecated. ;-)
%
% Note that fpresetsticky() has been retained on FreeBSD/i386. As far
% as I can tell, no other operating systems or ports of FreeBSD
% implement it, so there's nothing for it to be inconsistent with.
%
% PR: 75862
% Suggested by: bde
% ----------------------------
Bruce
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