Date: Fri, 15 Mar 2002 15:53:22 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: Tadayuki OKADA <tokada@isi.com> Cc: <standards@FreeBSD.ORG> Subject: Re: _MULTI_LIBM Message-ID: <20020315153546.N22775-100000@gamplex.bde.org> In-Reply-To: <3C90FDA0.E7280635@isi.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, 14 Mar 2002, Tadayuki OKADA wrote: > Why is FreeBSD's mathlib compiled with -D_IEEE_LIBM, > not -D_MULTI_LIBM? Partly for historical reasons: # RCS file: /home/ncvs/src/lib/msun/Makefile,v # Working file: Makefile # head: 1.28 # ... # ---------------------------- # revision 1.12 # date: 1997/01/08 13:22:28; author: wollman; state: Exp; lines: +2 -2 # Delete -D_POSIX_MODE and -D_MULTI_LIBM from CFLAGS. They never had any effect # because _IEEE_LIBM always takes priority, so the definition just served # to confuse. # # Reviewed by: bde # ---------------------------- No one complained (at least loadly) about this, so the feature obviously wasn't missed much. Partly because _POSIX_MODE is incompletely and poorly implemented: - most functions don't set errno as specified in C90. - error handling usually degrades IEEE754'ness by replacing NaNs or perhaps even Infs by normal numbers. Partly because compiling with _MULTI_LIBM pessimizes all modes. > It's not POSIX complient nor ANSI. It is now :-). C99 supports IEEE754, and doesn't require math functions to set errno. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-standards" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20020315153546.N22775-100000>