CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

This issue is addressed in https://github.com/CGAL/cgal/pull/5152

I think a workaround that does not imply merging the PR is to add
#include <boost/bind/placeholders.hpp>
using boost::placeholders::_1;
using boost::placeholders::_2;
using boost::placeholders::_3;

before including any CGAL code.

HTH,

Sebastien.

On 1/14/21 5:55 PM, Filippo ( via cgal-discuss Mailing 
List) wrote:
> Hello
>
> I am trying to link CGAL to my software. I cannot compile neither CGAL 
> 5.2 (git branch 5.2.x-branch) nor CGAL 5.1 (git branch 5.1.x-branch) 
> with Boost 1.75 and mpicc/mpiccx (openmpi/4.0.2 and gcc-4.8.5). My 
> software exploits libmesh to compute mesh intersection via CGAL.
>
> The error I get concerns the placeholders and it is apparently a current 
> issue with CGAL/Boost interfacing
>
> /$locinst/cgal/include/CGAL/convex_hull_3.h: In function 'typename 
> std::__cxx11::list<Point>::iterator 
> CGAL::Convex_hull_3::internal::farthest_outside_point(Face_handle, 
> std::__cxx11::list<Point>&, const Traits&)':
> $locinst/cgal/include/CGAL/convex_hull_3.h:579:67: error: '_1' was not 
> declared in this scope
>    579 | boost::bind(less_dist_to_plane, plane, _1, _2));
> | ^~
> ///$locinst///cgal/include/CGAL/convex_hull_3.h:579:67: note: suggested 
> alternatives:
> In file included from 
> $locinst/boost/include/boost/mpl/aux_/include_preprocessed.hpp:37,
>                   ...
> $locinst/boost/include/boost/mpl/aux_/preprocessed/gcc/placeholders.hpp:29:16: 
> note:   'mpl_::_1'
>     29 | typedef arg<1> _1;
>        |                ^~
> ....
> /gpfs/softs/spack/opt/spack/linux-centos7-haswell/gcc-4.8.5/gcc-9.2.0-k4debouieljbsurbrr2w755davwl6xsu/include/c++/9.2.0/functional:211:34: 
> note:   'std::placeholders::_1'
>    211 |     extern const _Placeholder<1> _1;/
>
> I configure CGAL via the following command:
>
> /cmake -DCMAKE_INSTALL_PREFIX=${locinst}/cgal -DCMAKE_BUILD_TYPE=Release 
> -DGMP_LIBRARIES=//${locinst}///gmp-6.1.2/lib/libgmp.so 
> -DMPFR_LIBRARIES=//${locinst}///mpfr-3.1.6/lib/libmpfr.so 
> -DGMP_INCLUDE_DIR=//${locinst}///gmp-6.1.2/include 
> -DMPFR_INCLUDE_DIR=//${locinst}///mpfr-3.1.6-dw2bdrou2piprxsnfj3qsbroml3ych6v/include 
> -DCGAL_HEADER_ONLY=OFF $srclib/cgal/
>
> Boost 1.75 is configured with mpicc.
>
> Finally, the libmesh installation is based on petsc 3.13.1 with 
> mpicc/mpicxx.
>
> Is there any workaround for this? Should I switch to gnu++14 dialect in 
> my software or reinstall gcc with gnu++14 dialect support?
>
> Thanks
>
> Filippo
>
>
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