CGAL users discussion list

[Stefan Salewski <>]

On Wed, 2013-10-09 at 01:09 +0200, Noel Warren wrote:
> I can't believe it was that easy.  Thanks Marc, easy when you know
> what
> you're doing.  Having other problems now but they are more palatable.
>  Cheers

What have you done exactly to solve your problem?
For me on Linux all is OK as I wrote, but it may be good to know the
problems on other OS.

I have examined the swig Ruby stuff too early this year, but my feeling
is that very good C++, CGAL and Swig knowledge is necessary to succeed
-- or an expert who does it.

I have just tested with Ruby 2.0, which is available for my Gentoo box,
but not fully supported currently.

I get

stefan@AMD64X2 ~/RAPOLLONIUS $ ruby test.rb 
terminate called after throwing an instance of
'CGAL::Assertion_exception'
  what():  CGAL ERROR: assertion violation!
Expr: -CGAL_IA_MUL(-1.1, 10.1) != CGAL_IA_MUL(1.1, 10.1)
File: /usr/include/CGAL/Interval_nt.h
Line: 209
Explanation: Wrong rounding: did you forget the  -frounding-math  option
if you use GCC (or  -fp-model strict  for Intel)?
Aborted

Makefiles for Ruby 2 and Ruby 1.9.3 differ, so it seems to be not enough
to have

stefan@AMD64X2 ~/RAPOLLONIUS $ grep frounding extconf.rb 
$CFLAGS += " -frounding-math"

There seems to be more important flags for Ruby 2.

Best regards

Stefan Salewski