CGAL users discussion list

["Anzel, Phil - NRCS, Fort Collins, CO" <>]

Hello,

 

I am unable to build some of the CGAL examples under Cygwin. All of the failing examples share similar error messages.

 

Any guidance would be most appreciated.

 

Following are the steps that I followed and a sample error from a "make".

 

Cygwin (x64) installed under Windows 7 to d:\cygwin64.

 

CGAL source downloaded from  https://github.com/CGAL/cgal/releases/download/releases%2FCGAL-4.9/CGAL-4.9.zip

and unzipped to D:\cygwin64\usr\CGAL-4.9

 

All libraries supposedly needed for CGAL were installed via the Cygwin x64 setup.

 

Initial cmake:

    cd /usr/CGAL-4.9

    cmake -DCMAKE_LEGACY_CYGWIN_WIN32=1 -DWITH_CGAL_Qt5=OFF -DWITH_examples=ON  .

 

Some examples could not be configured, these included the *mesh* and Scale_space_reconstruction_3 examples.

    cd /usr/CGAL-4.9

    make

    make examples

 

The first few examples were created successfully. For example,

    PATH=/usr/local/bin:/usr/bin:/bin:/lib:/usr/CGAL-4.9/bin:/usr/CGAL-4.9/lib

    cd /usr/CGAL-4.9/examples/AABB_tree

    ./AABB_triangle_3_example.exe

    3 intersections(s) with ray query

    closest point is: 0.333333 0.333333 0.333333

    squared distance: 8.33333

 

A later example demonstrates a nagging problem that shows up in a number of the examples:

    cd /usr/CGAL-4.9/examples/Snap_rounding_2/

    cmake -DCGAL_DIR=/usr/CGAL-4.9 .

    make

 

Scanning dependencies of target snap_rounding

[ 16%] Building CXX object CMakeFiles/snap_rounding.dir/snap_rounding.cpp.o

In file included from /usr/CGAL-4.9/include/CGAL/CORE/CoreDefs.h:41:0,

                 from /usr/CGAL-4.9/include/CGAL/CORE/BigFloatRep.h:40,

                 from /usr/CGAL-4.9/include/CGAL/CORE/BigFloat.h:38,

                 from /usr/CGAL-4.9/include/CGAL/CORE_BigFloat.h:27,

                 from /usr/CGAL-4.9/include/CGAL/CORE_arithmetic_kernel.h:39,

                 from /usr/CGAL-4.9/include/CGAL/Arithmetic_kernel.h:51,

                 from /usr/CGAL-4.9/include/CGAL/Arr_rational_function_traits_2.h:28,

                 from /usr/CGAL-4.9/include/CGAL/Sweep_line_2_algorithms.h:37,

                 from /usr/CGAL-4.9/include/CGAL/Snap_rounding_2.h:28,

                 from /usr/CGAL-4.9/examples/Snap_rounding_2/snap_rounding.cpp: :

/usr/CGAL-4.9/include/CGAL/CORE/extLong.h:171:8: warning: ‘CORE::extLong::extLong(int)’ redeclared without dllimport attribute after being referenced with dll linkage

inline extLong::extLong(int i) : val(i), flag(0) {

        ^

/usr/CGAL-4.9/include/CGAL/CORE/extLong.h:292:13: warning: ‘bool CORE::extLong::isNaN() const’ redeclared without dllimport attribute after being referenced with dll linkage

inline bool extLong::isNaN() const {

 

There are a number of similar errors that have been omitted here.

 

This same issue has been submitted as http://stackoverflow.com/questions/41274230/cannot-make-cgal-examples-in-cygwin.

 

Thanks!!!

 

Phil Anzel

Senior Developer

Work: 970-295-5440  |

2150 Centre Ave, Bldg A, Fort Collins, CO 80526

USDA/NRCS Contractor - Team ASRC Federal Vistronix | Customer-Focused. Operationally Excellent.

 

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