CGAL users discussion list

[Antonio Ferraz <>]

Salut

Thanks for the reply.

It's sounds good, however ( i think) I have some Cmake problems

I added "-ftemplate-depth-1000" but unfortunately still the same error. When i look to the CMakeChache "-ftemplate-depth-50" stills there, so far, I use both 

"-ftemplate-depth-50" and "-ftemplate-depth-1000". I do not know how to remove  "-ftemplate-depth-50" from the compilation, despite the few hours looking for a answer.

I use also others libraries in the same project (ITK, OTB, LIDARFORMAT etc), and i dont know if the problem can rely on that. I had changed also , for example, "-ftemplate-depth-50" to "-ftemplate-depth-1000" on ITK CMakeList but nothing, impossible to kill "-ftemplate-depth-50"

Concerning the other question, I really have in  "/usr/include/CGAL/compiler_config.h"  "CGAL_USE_GMP 1" and " CGAL_USE_MPFR 1" defined.

I should have  "-DCGAL_USE_GMP" and "-DCGAL_USE_MPFR" instead, as you said in the last reply?

  

Merci

Antonio

2011/2/16 Laurent Rineau (GeometryFactory) <>

Le mercredi 16 février 2011 13:07:05, tochaf a écrit :
> Hy
>
> I had installed libcgal 3.5.1-1 from synaptic on my ubuntu 10.4.
>
> Now, i able to use some functions of CGAL, as instance of:
>
> #include <CGAL/Constrained_Delaunay_triangulation_2.h>
> #include <CGAL/Triangulation_hierarchy_2.h>
> #include <CGAL/Constrained_triangulation_plus_2.h>
>
> However, when i try to use:
>
> #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
>
> I lead to:
>
>
> /usr/include/boost/operators.hpp:129: error: template instantiation depth
> exceeds maximum of 50 (use -ftemplate-depth-NN to increase the maximum)
> instantiating ‘struct
> boost::equality_comparable2<CGAL::Quotient<CGAL::MP_Float>, double,
> boost::detail::empty_base<CGAL::Quotient<CGAL::MP_Float> > >’
> /usr/include/boost/operators.hpp:129:   instantiated from
> ‘boost::less_than_comparable2<CGAL::Quotient<CGAL::MP_Float>, double,
> boost::equality_comparable2<CGAL::Quotient<CGAL::MP_Float>, double,
> boost::detail::empty_base<CGAL::Quotient<CGAL::MP_Float> > > >’
> /usr/include/boost/operators.hpp:409:   instantiated from
> ‘boost::totally_ordered2<CGAL::Quotient<CGAL::MP_Float>, double,
> boost::detail::empty_base<CGAL::Quotient<CGAL::MP_Float> > >’
>
>
> and so on, a lot of errors.
>
>  I use gcc as "compilator" in my eclipse projects.
>
> Thus, is it a gmp issue? Why
> Exact_predicates_inexact_constructions_kernel.h "doesnt work"?

This is not a GMP issue.

It seems your Eclipse project uses the compilation flag "-ftemplate-depth-50".
Modify the Eclipse project to remove it, or use "-ftemplate-depth-1000"
instead. You also absolutely need the compilation flag "-frounding-math" if
not present, and absolutelu NOT "-ffast-math" (remove it or use -fno-fast-math
instead).

Probably the CGAL::Exact_predicates_inexact_constructions_kernel needs more
than 50 levels of templates. I am not surprised because this kernel falls back
to an exact arithmetic using CGAL::Quotient<CGAL::MP_Float>, and that number
types uses the Boost.operators library (from www.boost.org), that needs a lot
of templates levels.

Note that it seems your CGAL installation is configured not to use GMP, but
CGAL::MP_Float instead for exact arithmetic. It would be better to configure
CGAL with GMP, because GMP is faster than the internal class CGAL::MP_Float.
You should add "-DCGAL_USE_GMP" and "-DCGAL_USE_MPFR" to your compilation
flags. Those flags you be in /usr/include/CGAL/compiler_config.h, and I wonder
why they are not defined...

--
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/

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Antonio Ferraz
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