CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

See http://www.cgal.org/FAQ.html#inexact_NT

you're missing -lgmp -lmpfr and probably -frounding-math

Sebastien.


On 07/24/2013 01:23 AM, Willy Lambert wrote:
> Sry for noise, last message went out too quickly an error paste is
> missing. Corrected inside the email
>
>
> 2013/7/24 Willy Lambert 
> <
> <mailto:>>
>
>     (should I top post or down post on this list ?)
>
>     Thanks for answering. Could you tell me a bit more about what this
>     would change ? It's not very clear for me what the Kernel is.
>
>     I modified the typedef and add :
>     #include <CGAL/Exact_predicates_exact_constructions_kernel.h>
>
>     Then I run into 2 types of problems :
>     _ I doesn't link (missing gmpq and mpfr)(build log at the end),
>     should I add anything (cmake config ? libraries to download) ?
>     _ I can't use A[0].x() to print things into console (it says :
>     ../src/test_cgal.cpp:105:37: error: invalid cast from type
>     ‘CGAL::cpp11::result_of<CGAL::Lazy_construction_nt<CGAL::Epeck,
>     
> CGAL::CartesianKernelFunctors::Compute_x_2<CGAL::Simple_cartesian<CGAL::Interval_nt<false>
>      > >,
>     
> CGAL::CartesianKernelFunctors::Compute_x_2<CGAL::Simple_cartesian<CGAL::Gmpq>
>      > >(CGAL::Point_2<CGAL::Epeck>)>::type {aka
>     CGAL::Lazy_exact_nt<CGAL::Gmpq>}’ to type ‘int’)
>
>     Here is the build error :
>     Building target: test_cgal
>     Invoking: GCC C++ Linker
>     g++ -L/home/robot/workspace/CGAL-4.2/build/lib -o "test_cgal"
>     ./src/test_cgal.o   -lCGAL -lboost_thread-mt -lboost_system-mt
>     ./src/test_cgal.o: In function `CGAL::Gmpq_rep::Gmpq_rep()':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:51:
>     undefined reference to `__gmpq_init'
>     ./src/test_cgal.o: In function `CGAL::Gmpq_rep::~Gmpq_rep()':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:52:
>     undefined reference to `__gmpq_clear'
>     ./src/test_cgal.o: In function `CGAL::Gmpq::Gmpq(int)':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:87:
>     undefined reference to `__gmpq_set_si'
>     ./src/test_cgal.o: In function `CGAL::Gmpq::operator==(CGAL::Gmpq
>     const&) const':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:193:
>     undefined reference to `__gmpq_equal'
>     ./src/test_cgal.o: In function `CGAL::Gmpq::operator<(CGAL::Gmpq
>     const&) const':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:194:
>     undefined reference to `__gmpq_cmp'
>     ./src/test_cgal.o: In function `CGAL::Gmpq::operator==(int) const':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:213:
>     undefined reference to `__gmpq_cmp_si'
>     ./src/test_cgal.o: In function `CGAL::Gmpq::operator<(int) const':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:214:
>     undefined reference to `__gmpq_cmp_si'
>     ./src/test_cgal.o: In function `CGAL::Gmpq::operator-() const':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:260:
>     undefined reference to `__gmpq_neg'
>     ./src/test_cgal.o: In function `CGAL::Gmpq::operator+=(CGAL::Gmpq
>     const&)':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:276:
>     undefined reference to `__gmpq_add'
>     ./src/test_cgal.o: In function `CGAL::Gmpq::operator-=(CGAL::Gmpq
>     const&)':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:286:
>     undefined reference to `__gmpq_sub'
>     ./src/test_cgal.o: In function `CGAL::Gmpq::operator*=(CGAL::Gmpq
>     const&)':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:296:
>     undefined reference to `__gmpq_mul'
>     ./src/test_cgal.o: In function `CGAL::Gmpq::operator/=(CGAL::Gmpq
>     const&)':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/GMP/Gmpq_type.h:307:
>     undefined reference to `__gmpq_div'
>     ./src/test_cgal.o: In function
>     
> `CGAL::Real_embeddable_traits<CGAL::Gmpq>::To_interval::operator()(CGAL::Gmpq
>     const&) const':
>     /home/robot/workspace/CGAL-4.2/include/CGAL/Gmpq.h:92: undefined
>     reference to `mpfr_init2'
>     /home/robot/workspace/CGAL-4.2/include/CGAL/Gmpq.h:93: undefined
>     reference to `mpfr_set_q'
>     /home/robot/workspace/CGAL-4.2/include/CGAL/Gmpq.h:94: undefined
>     reference to `mpfr_get_d'
>     /home/robot/workspace/CGAL-4.2/include/CGAL/Gmpq.h:95: undefined
>     reference to `mpfr_set_q'
>     /home/robot/workspace/CGAL-4.2/include/CGAL/Gmpq.h:96: undefined
>     reference to `mpfr_get_d'
>     /home/robot/workspace/CGAL-4.2/include/CGAL/Gmpq.h:97: undefined
>     reference to `mpfr_clear'
>     collect2: error: ld returned 1 exit status
>
>
>     2013/7/23 Sebastien Loriot (GeometryFactory) 
> <
>     
> <mailto:>>
>
>         The first thing to try is to replace
>
>
>         typedef CGAL::Cartesian<Number_type> Kernel;
>         by
>         typedef CGAL::Exact_predicates_exact___constructions_kernel Kernel;
>
>         Sebastien.
>
>
>         On 07/23/2013 08:47 PM, Willy Lambert wrote:
>
>             Hi all,
>
>             I'm quite new to cgal, and I'm trying to use it in robotics path
>             planning. To do so I create a polygon with holes which show
>             reachable
>             areas. I initiate a polygon set with the "outer" map and
>             then do a
>             difference with each obstacles thougth eating borders of the
>             map or
>             creating an hole.
>
>             It is working for many obstacles except one, which is
>             asserting when I
>             do the difference. I didn't used cgal enougth to be able to
>             find if it
>             is a cgal bug or a mis-use so I'm asking some help here to
>             clarify this.
>
>             Here is a simple code to reproduce :
>
>             typedef float Number_type;
>             typedef CGAL::Cartesian<Number_type> Kernel;
>             typedef Kernel::Point_2 Point_2;
>             typedef CGAL::Polygon_2<Kernel> Polygon_2;
>             typedef CGAL::Polygon_with_holes_2<__Kernel>
>             Polygon_with_holes_2;
>             typedef CGAL::Polygon_set_2<Kernel> Polygon_set_2;
>
>             Polygon_2 A,B;
>
>             A.push_back(Point_2(1350, -850));
>             A.push_back(Point_2(1350, 850));
>             A.push_back(Point_2(-1350, -850));
>
>             B.push_back(Point_2(1003, -116));
>             B.push_back(Point_2(947, -251));
>             B.push_back(Point_2(984, -1000));
>
>             Polygon_set_2 S;
>             S.insert(A);
>             S.difference(B);
>
>
>             It compiles and throw at execution :
>
>             (atlantronic) robot@ard-host ~/workspace/test_cgal/Debug $
>             ./test_cgal
>             terminate called after throwing an instance of
>             'CGAL::Precondition_exception'
>                 what():  CGAL ERROR: precondition violation!
>             Expr: comp_f(object, parentP->object) != SMALLER
>             File: /home/robot/workspace/CGAL-4.__2/include/CGAL/Multiset.h
>             Line: 2129
>             Aborted (core dumped)
>
>             Here is a screen shot if it can help visualizing  the problem.
>             
> http://cgal-discuss.949826.n4.__nabble.com/file/n4657830/cgal___problem.png
>             
> <http://cgal-discuss.949826.n4.nabble.com/file/n4657830/cgal_problem.png>
>
>
>             Let me know if you need any further information or if I need to
>             re-formulate my demand which standard debug information set.
>
>             Regards.
>
>
>
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