On Sat, Apr 9, 2011 at 11:10 PM, N. C. wrote: > On 4/9/11, marco atzeri <xxxxxxxxxxxxxxxx> wrote:
don't quote email address. On this list is highly unpolite. >>>>I have recently discovered that the cygwin version I am using (1.7.7) >>>>doesn't support many long-double function, like sqrtl, modfl, frexpl, >>>>etc. As cgf mentioned they are not implemented "yet" in cygwin >>>> >>>>I have been reading on newlib's website, sourceware.org/newlib, that >>>>as of version 1.18.0, such long-double functions are now supported. >>>>(http://sourceware.org/ml/newlib/2009/msg01135.html) >> >> further the newlib announce says: >> * long double math routines added for platforms where LDBL == DBL on cygwin LDBL(80 bit) != DBL(64 bit) so we have not such outcome >> >> so in reality you gain no additional performance on the double. >> >>>> >>>>What I can't seem to find out is, what version of newlib is in the >>>>newest release of cygwin, and if it has this better support for >>>>long-double functions. >>> >>> Cygwin uses whatever is in the newlib tree as of its release date. That >>> means that since Cygwin 1.7.7-1 was released in August 2010* it would >>> incorporate any newlib changes from 2009. That doesn't mean that we would >>> export every single thing that newlib provides, however. If functionality >>> is missing that means that no one has taken the time to get it working in >>> the Cygwin DLL. >>> >>> cgf >>> >>> *http://sourceware.org/ml/cygwin-announce/2010-08/msg00035.html >>> >> >> on 1.7.8 most of the missing "double" function were added >> http://sourceware.org/ml/cygwin-announce/2011-03/msg00000.html >> >> I thought to implement also the long double but as doubles are 64 bit >> and long doubles are just 80 bits on windows, I found the effort not worth. >> >> Marco > > I have fully updated my cygwin tp 1.7.9(0.237/5/3) and I still get > this error when I try to build Perl (5.12.3 in this case but same with > other versions) with uselongdouble enabled in the Configure script, > which fails with: > > *** You requested the use of long doubles but you do not seem to have > *** the following mathematical functions needed for long double support: > *** sqrtl modfl frexpl > *** Please rerun Configure without -Duselongdouble and/or -Dusemorebits. > *** Cannot continue, aborting. The message is clear "Don' use long double". Have you checked how the cygwin perl mantainer is doing the things ? > > > On a Linux system that I have access to, I see that those functions > are in /lib/libm.* but cygwin's /lib/libm.* still seems to lack them. > Is there any work around or alternate version ofthis lib that actually > has these functions. I honestly do not mean to be rude, but how > difficult is it to impliment these functions which seem so common in > most unix-like systems? It is not overcomplicated to implement it, but it takes time and someone to do it. When I implemented all the complex functions (cabs, ccos..) I spent one month to make it right. A more capable guy will take less surely, but as mention I see little benefit moving from 64 to 80 bits so I was not interested to implement it. > Or did nothing not get updated when I updated > cygwin? > > Thanks, > > M. C 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
