CGAL users discussion list

[Sebastien Loriot <>]

CGAL no longer supports the intel compiler (due to bugs in older version 
and lack of interest from users).
hash_functions.h does includes <type_traits> 
<https://en.cppreference.com/w/cpp/header/type_traits> so it should be 
fine. Maybe it is a bug of the compiler or it has
to do with the c++17 option.

If there is an increasing demand for Intel compilers  we could 
reconsider it supporting it
or even better if there is an institute or a company willing to sponsor 
its support.

Best regards,

Sebastien.

On 12/9/20 12:06 AM, Aaron Smith wrote:
> Hi cgal-discuss,
>
> I am new to this list so first of all thanks for the library. I have 
> been using CGAL to build Voronoi tessellations in one of my academic 
> research codes. This works well with gcc and clang compilers, but when 
> I try to use intel compilers on some supercomputers I get errors like 
> the ones shown below (for example). I have success with Intel on 1 
> supercomputer but get these errors on 3 others. Is this a known issue? 
> Am I missing something or is Intel not expected to be supported?
>
> Note: CGAL version 5.1.1 and Intel 19 on linux (but no root access) 
> systems. Installing headers locally and including via Makefile (not 
> from CMake). I am using -std=c++17
>
> Thanks,
> Aaron
>
> —
>
> local/include/CGAL/Kernel/hash_functions.h(25): error: namespace "std" 
> has no member "enable_if_t"
>   inline std::enable_if_t<std::is_same<typename K::Rep_tag, 
> Cartesian_tag>::value, std::size_t>
>               ^
>
> In file included from local/include/CGAL/Kernel/global_functions.h(25),
>                  from local/include/CGAL/Cartesian/Cartesian_base.h(22),
>                  from local/include/CGAL/Simple_cartesian.h(20),
>                  from 
> local/include/CGAL/Exact_predicates_inexact_constructions_kernel.h(20),
>                  from src/geometry/cgal.h(16),
>                  from src/geometry/cgal.cc <http://cgal.cc>(13):
> local/include/CGAL/Kernel/hash_functions.h(25): error: expected a ";"
>   inline std::enable_if_t<std::is_same<typename K::Rep_tag, 
> Cartesian_tag>::value, std::size_t>
>    ^
>
> In file included from local/include/CGAL/Kernel/global_functions.h(25),
>                  from local/include/CGAL/Cartesian/Cartesian_base.h(22),
>                  from local/include/CGAL/Simple_cartesian.h(20),
>                  from 
> local/include/CGAL/Exact_predicates_inexact_constructions_kernel.h(20),
>                  from src/geometry/cgal.h(16),
>                  from src/geometry/cgal.cc <http://cgal.cc>(13):
> local/include/CGAL/Kernel/hash_functions.h(195): error: no instance of 
> overloaded function "CGAL::hash_value" matches the argument list
>             argument types are: (const CGAL::Bbox_2)
>       return CGAL::hash_value (bbox);
>              ^
> local/include/CGAL/Kernel/hash_functions.h(22): note: this candidate 
> was rejected because at least one template argument could not be deduced
>   using boost::hash_value;
>                ^
>
> --
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