Date: Sun, 6 Feb 2011 17:13:35 -0500 From: David Schultz <das@freebsd.org> To: Gerald Pfeifer <gerald@pfeifer.com> Cc: "Pedro F. Giffuni" <giffunip@yahoo.com>, freebsd-toolchain@freebsd.org Subject: Re: -fno-math-errno by default Message-ID: <20110206221335.GA76984@zim.MIT.EDU> In-Reply-To: <alpine.LNX.2.00.1102062007490.8943@gerinyyl> References: <alpine.LNX.2.00.1102062007490.8943@gerinyyl>
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On Sun, Feb 06, 2011, Gerald Pfeifer wrote: > Pedro kindly made me aware of > > http://svn.freebsd.org/viewvc/base?view=revision&revision=181538 > > where David made -fno-math-errno the default for GCC with the following > background: > > Our libm doesn't support the SysV mistake of setting errno, and never > has. This will need to be fixed upstream in a more generic way, but > the changes are somewhat more involved. > > Do I understand correctly that libm on all versions of FreeBSD and on > all platforms does not set errno, so this should become the default for > FreeBSD also upstream? That is correct. Basically nobody sets errno in the math library anymore, except for compatibility with old apps written for the System V math library. BSD never has and never will. IEEE 754 floating point exception flags are much saner and faster. > It would have been nice to report this upstream (and apologies if you > did and it got missed) and I'll try to raise it there, but wanted to > get confirmation first. I submitted a change request to gcc about 2.5 years ago: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37073help
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