X-Recipient: archive-cygwin AT delorie DOT com X-SWARE-Spam-Status: No, hits=-5.8 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,KHOP_RCVD_TRUST,KHOP_THREADED,RCVD_IN_DNSWL_LOW,RCVD_IN_HOSTKARMA_YE X-Spam-Check-By: sourceware.org Message-ID: <50C19A0A.50701@gmail.com> Date: Fri, 07 Dec 2012 08:26:02 +0100 From: marco atzeri User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/17.0 Thunderbird/17.0 MIME-Version: 1.0 To: cygwin AT cygwin DOT com Subject: Re: gcc -ansi produces unexpected floating point result References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com On 12/7/2012 8:04 AM, Paul Edwards wrote: > /* This program demonstrates a presumed bug in gcc 3.4.4 shipped > with cygwin. try gcc4, gcc3 is obsolete. If still exist, please check if the bug is present also on another platforms as it could be a general issue and not a cygwin specific one. > > If compiled with gcc -mno-cygwin -ansi, it prints: > > C:\devel\bwbasic>gcc -mno-cygwin -ansi zatest.c > > C:\devel\bwbasic>a > 0.000000 > 2.000000 > > Instead of the expected 2.000000 for the first line, and undefined > for the second line. > > Without -ansi it produces a good result. > > */ > > #include > > int main(void) > { > double x = 2.0; > > printf("%lf\n", x); > printf("%f\n", x); > return (0); > } > > Regards Marco -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple