llrint implementation in Cygwin

Victor Paesa wzrlpy@arsystel.com
Mon Oct 29 11:19:00 GMT 2007


Hi,

Tim Prince <tprince <at> computer.org> writes:
> 
> Diego Biurrun wrote:
> > Hi!
> > 
> > I have noticed that Cygwin does not implement llrint.  However, llrint
> > is part of C99 and not having it available makes some applications (for
> > example MPlayer and FFmpeg) fail to compile.
> > 
> > Are there any plans to implement llrint (in the near future)?
> > 
> 
> Perhaps if you would submit a patch to newlib, something may happen.
> It's not difficult to back-port stand-alone from recent gcc if you don't
> want to wait for cygwin to include a gcc upgrade, about which there have
> been plenty of threads here.  You could include it in a <mathinline.h>
> of your choice.
> http://gcc.gnu.org/ml/gcc-patches/2005-03/msg01970.html
> http://gcc.gnu.org/ml/gcc-patches/2005-03/msg01973.html
> shows that it has been available for 2.5 years.

I found another way: leverage the llrint() implementation in MinGW.

a) We need first to download the mingw-runtime Cygwin package.

b) Then we create a small library:

ar x /usr/lib/mingw/libmingwex.a llrint.o
ar cq /usr/local/lib/libllrint.a llrint.o

c) And finally, we use that library in FFmpeg configure line:

 --extra-ldflags='-L /usr/local/lib' --extra-libs='-l llrint'

It might not be the most elegant solution, but it is strightforward, and 
it works.

Regards,
Victor


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