R: Quad precision floating point package for gfortran

Marco Atzeri marco_atzeri@yahoo.it
Wed Sep 8 08:09:00 GMT 2010

--- Mer 8/9/10, Jerry DeLisle ha scritto:

> We are developing a quad precision
> floating point library for use with gfortran.
> When attempting to build the library under Cygwin, we are
> stopped because:
> __float128 is not supported when running the ./configure
> for the package.  I suspect the issue may be related to
> newlib vs glibc, but I really don't know.

on cygwin we have 

double = 64 bits
long double = 96 bits

but no float128


> Do any of the Cygwin maintainers have any hints about
> this?  I am still investigating.  It would be nice
> to have this quad precision capability under Cygwin. 
> The library is a software floating point library and does
> not depend on having special hardware.  We have it
> running on i686 and x86-64 Linux, but so far no luck under
> Windows.  If I learn more in the next few days, I will
> report here.
> Any suggestions would be appreciated.

I leave that to Dave :-)
but I guess you need to add them on newlib 
as there is no float128 there.

> Best regards,
> Jerry


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