X-Spam-Check-By: sourceware.org Reply-To: , From: "Dave Korn" To: Cc: , , Subject: RE: gcc-3.4.4-1: c++: cmath: calling std::isnan results in endless loop Date: Mon, 27 Feb 2006 17:18:26 -0000 Message-ID: <01d701c63bc1$d20e7e90$a501a8c0@CAM.ARTIMI.COM> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit In-Reply-To: Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On 27 February 2006 17:00, gdr@integrable-solutions.net wrote: > "Dave Korn" writes: > > [...] > >> It looks to me like the cygwin/newlib combination is not being compliant >> if it implements isnan as a function rather than a macro. I couldn't see >> anything in the standard that says it can be a function, and every >> reference to it describes it as a macro, not a function. It may be the >> case that libstdc++ is within its rights to assume that isnan is a macro >> after all. > > yes, isnan and friends are supposed to be macros only, not functions. Thanks for the confirmation. I have yet to figure out whether this is specific to newlib-on-cygwin, or applies to other newlib configurations as well, but that rules out libstdc++ from being the underlying cause of the problem here. >> OTOH it may be that libstdc++ was only supposed to be shadowing those >> ctype macros that are guaranteed to have underlying function >> implementations; I don't know what the shadowing is for, so I can't >> comment. > > libstdc++ is supposed to shadow ctype macros -- and it also expect > them to have a function implementation. Ah, does that imply it is also /supposed/ to shadow math.h macros, but it does /not/ expect them to have a function implementation? Or that it is /not/ supposed to shadow math macros, only ctype ones, /because/ only they are guaranteed to have a function implementation as well/ cheers, DaveK -- Can't think of a witty .sigline today.... -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/