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Date: | Thu, 11 Jan 2001 22:12:00 +0200 |
From: | "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il> |
Sender: | halo1 AT zahav DOT net DOT il |
To: | "Tanes Sriviroolchai" <Tanes DOT Sriviroolchai AT Thailand DOT NCR DOT COM> |
Message-Id: | <2593-Thu11Jan2001221159+0200-eliz@is.elta.co.il> |
X-Mailer: | Emacs 20.6 (via feedmail 8.3.emacs20_6 I) and Blat ver 1.8.6 |
CC: | djgpp AT delorie DOT com |
In-reply-to: | <3a5d81c9@rpc1284.daytonoh.ncr.com> |
(Tanes DOT Sriviroolchai AT Thailand DOT NCR DOT COM) | |
Subject: | Re: Weird results of log( -1.0 ) with libm.a and without libm.a |
References: | <3a5d81c9 AT rpc1284 DOT daytonoh DOT ncr DOT com> |
Reply-To: | djgpp AT delorie DOT com |
Errors-To: | nobody AT delorie DOT com |
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> From: "Tanes Sriviroolchai" <Tanes DOT Sriviroolchai AT Thailand DOT NCR DOT COM> > Newsgroups: comp.os.msdos.djgpp > Date: Thu, 11 Jan 2001 16:49:21 +0700 > > gcc -o test1.exe test1.c > when running you will get > > NaN > > This is expected result. However if I compile using > gcc -o test1.exe test1.c -lm > and then running, you will get > > -Inf In addition to what I already wrote in this thread, you can request that the libm version returns the same NaN as the libc version by forcing libm into the IEEE mode, like this: #include <libm/math.h> _LIB_VERSION_TYPE _LIB_VERSION = _IEEE_; This turns on the IEEE compatibility, but you lose the matherr feature, and also the value of errno will not be set to EDOM/ERANGE.
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