llrint implementation in Cygwin

Igor Peshansky pechtcha@cs.nyu.edu
Fri Sep 28 12:06:00 GMT 2007

On Fri, 28 Sep 2007, Diego Biurrun wrote:

> Tim Prince wrote:
> > Diego Biurrun wrote:
> >
> > > 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.
> Telling me what newlib is would greatly help in this regard :-)

Newlib is the library that Cygwin uses for some standard functions (math
and otherwise).

(The only way to interpret this question is "what is the connection
between newlib and Cygwin", as a quick Google would have pointed you to
the newlib webpage).

> > 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.
> Do I understand correctly that Cygwin will provide llrint with the next
> gcc upgrade?

Yes, but it won't happen for a while.

> I understand that adding llrint to Cygwin is probably not hard at all
> for somebody familiar with Cygwin.  However, I am not such a person and
> I don't even have a Windows environment around to test any modifications
> I might make.
> We are about to make an MPlayer release and unfortunately it will not
> compile on Cygwin due to the missing llrint.  I would appreciate to know
> if this is going to get addressed so that I can put an appropriate
> comment in the release notes.

What's wrong with adding llrint to your code (perhaps with a #define,

#define llrint my_llrint
typeof(llrint) my_llrint(...) { ... }

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