Re: fenv.h support for alpha?

[Havard Eidnes <he%NetBSD.org@localhost>]

> I was trying to build ffmpeg3 from pkgsrc on NetBSD/alpha, and got this error:
>
> In file included from libavfilter/vf_drawtext.c:40:0:
> /usr/include/fenv.h:31:2: error: #error "fenv.h is currently not supported for this architecture"
>  #error "fenv.h is currently not supported for this architecture"
>   ^
>
> Back in 2014, Martin Husemann mentioned that he was planning to look at 
> adding support: 
> http://mail-index.netbsd.org/port-alpha/2014/03/07/msg000695.html
>
> There's also this PR 49997 about the lack of fenv.h support on various 
> architectures: http://gnats.netbsd.org/49997

The specific package mentioned here is lang/perl5, where I last
year added a patch to work around this problem, ref. the commit
message which says (among others):

   Add a Configure test to verify that including <fenv.h> doesn't produce
   a build error, as it will in quite few cases on NetBSD on archs which
   are not amd64, i386 or sparc in NetBSD 6.x.  If the test build fails,
   pretend we don't have fenv.h.

As for the more generic problem and the progress (or lack thereof) of
dealing "properly" with this I'll leave to others to answer for.  If I
recall correctly, we're a bit special in that we have <fenv.h> but not
all of our ports actually implement it, so packages with configure
tests which just check for the presence of <fenv.h> will fall on their
faces later, as you've noted.

Regards,

- Håvard