On Sat, 03 Feb 2018 22:55:56 -0500
Mark H Weaver <m...@netris.org> wrote:

> Hi Eric,
> 
> ericbav...@centurylink.net (Eric Bavier) writes:
> > bavier pushed a commit to branch master
> > in repository guix.
> >
> > commit cbc084e1a7c25d1c8944bcb20a989f795acdb096
> > Author: Eric Bavier <bav...@cray.com>
> > Date:   Wed Jan 31 13:55:37 2018 -0600
> >
> >     gnu: Add QD.  
> [...]
> > +(define-public qd
> > +  (package
> > +    (name "qd")
> > +    (version "2.3.18")
> > +    (source (origin
> > +              (method url-fetch)
> > +              (uri (string-append "http://crd.lbl.gov/~dhbailey/mpdist/qd-";
> > +                                  version ".tar.gz"))
> > +              (sha256
> > +               (base32
> > +                "0vkihcj9fyv2cycq8515713gbs3yskhmivy8bznvx72i6ddnn2c1"))))
> > +    (build-system gnu-build-system)
> > +    (native-inputs
> > +     `(("gfortran" ,gfortran)))
> > +    (arguments
> > +     `(#:configure-flags `("--disable-enable_fma" ;weird :/  
> 
> "weird :/" is not a very useful comment.

Sorry.  I thought it was obvious it was in reference to the
"disable-enable" bit.

>  Can you change it to explain
> why you added this flag?  It seems unfortunate to disable fused
> multiply-add for this kind of library.

The library does not support runtime ISA detection.  I thought FMAs are
something we don't support in our baseline x86-64 builds?

`~Eric

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