X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-2.5 required=5.0 tests=AWL,BAYES_00,SPF_PASS X-Spam-Check-By: sourceware.org Message-ID: <4AF3520B.60803@gmail.com> Date: Thu, 05 Nov 2009 22:30:35 +0000 From: Dave Korn User-Agent: Thunderbird 2.0.0.17 (Windows/20080914) MIME-Version: 1.0 To: cygwin@cygwin.com Subject: Re: status of gcc4 -ffast-math References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Id: 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 Hans Horn wrote: > Folks, > > what is the current status of -ffast-math for gcc4 under cygwin. > > I tried to use it for some numerical C code and get the following link > errors: > > eval.o:eval.c:(.text+0x79c): undefined reference to `_f_pow' > eval.o:eval.c:(.text+0x7d8): undefined reference to `_f_log' > eval.o:eval.c:(.text+0x7f0): undefined reference to `_f_exp' WJFFM: > $ cat math.c > > #include > > int main (int argc, const char **argv) > { > > float f = atof (argv[1]); > double d = log (f); > return exp (f); > } > > > admin@ubik /tmp/math > $ gcc-4 math.c -o math > > admin@ubik /tmp/math > $ gcc-4 math.c -o math -ffast-math > > admin@ubik /tmp/math > $ gcc-4 math.c -o math -ffast-math -O2 > > admin@ubik /tmp/math > $ gcc-4 math.c -o math -ffast-math -O3 > > admin@ubik /tmp/math > $ Perhaps a few more details about what you're doing, a simple reproducible testcase, what kind of command-lines you're using, etc. etc... might help. cheers, DaveK -- 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