CGAL users discussion list

[Laurent Saboret <>]

Hi,

Frankie Li wrote:
> Hi,
>
> I'm having some trouble compiling the Surface Reconstruction Points 
> demo.  I understand that there are similar problems from the archive, 
> but I can't quite figure out how to fix my problem based on the 
> solutions I've seen so far.
>
> When I try making, I end up with the warning:
>
> -----------------------------------------------------------------------
> /usr/bin/ld: skipping incompatible /usr/local/lib/libmetis.a when 
> searching for -lmetis
> /usr/bin/ld: skipping incompatible /usr/local/lib/liblapack.a when 
> searching for -llapack
> /usr/bin/ld: skipping incompatible /usr/local/lib/libmetis.a when 
> searching for -lmetis
> /usr/bin/ld: skipping incompatible /usr/local/lib/liblapack.a when 
> searching for -llapack
> -----------------------------------------------------------------------
This error may be due to the fact that you use gfortran instead of g77.
Changing the compiler implies that you recompile third party libraries
(Metis + Blas and Lapack if they are not already installed on you
machine, e.g. via a rpm). Third party libraries source code is available
at https://gforge.inria.fr/frs/download.php/24629/taucs_external_src.tgz

See my not below about gfortran.
> I get a set of undefined references from QT:
> -----------------------------------------------------------------------
> MakeFiles/Point_set_demo.dir/Viewer.o: In function 
> `Viewer::Viewer(QWidget*, bool)':
> Viewer.cpp:(.text+0x27b): undefined reference to 
> `QGLViewer::QGLViewer(QWidget*, QGLWidget const*, 
> QFlags<Qt::WindowType>)'
> CMakeFiles/Point_set_demo.dir/Viewer.o: In function 
> `Viewer::Viewer(QWidget*, bool)':
> Viewer.cpp:(.text+0x30b): undefined reference to 
> `QGLViewer::QGLViewer(QWidget*, QGLWidget const*, 
> QFlags<Qt::WindowType>)'
> CMakeFiles/Point_set_demo.dir/Viewer_moc.o: In function 
> `Viewer::qt_metacall(QMetaObject::Call, int, void**)':
> Viewer_moc.cpp:(.text+0xa1): undefined reference to 
> `QGLViewer::qt_metacall(QMetaObject::Call, int, void**)'
> CMakeFiles/Point_set_demo.dir/Viewer_moc.o: In function 
> `Viewer::qt_metacast(char const*)':
> Viewer_moc.cpp:(.text+0x167): undefined reference to 
> `QGLViewer::qt_metacast(char const*)'
> CMakeFiles/Point_set_demo.dir/Viewer_moc.o:(.rodata+0x0): undefined 
> reference to `QGLViewer::staticMetaObject'
> CMakeFiles/Point_set_demo.dir/Viewer_moc.o:(.rodata._ZTV6Viewer[vtable 
> for Viewer]+0x310): undefined reference to 
> `QGLViewer::setPlayPathKeyboardModifiers(QFlags<Qt::KeyboardModifier>)'
> CMakeFiles/Point_set_demo.dir/Viewer_moc.o:(.rodata._ZTV6Viewer[vtable 
> for Viewer]+0x318): undefined reference to 
> `QGLViewer::setAddKeyFrameKeyboardModifiers(QFlags<Qt::KeyboardModifier>)' 
>
> collect2: ld returned 1 exit status
> -----------------------------------------------------------------------
The Polyhedron demo requires the QGLViewer library.
> And finally:
> -----------------------------------------------------------------------
> usr/bin/ld: /usr/local/lib/libtaucs.a(taucs_sn_llt.o): relocation 
> R_X86_64_32 against `a local symbol' can not be used when making a 
> shared object; recompile with -fPIC
> /usr/local/lib/libtaucs.a: could not read symbols: Bad value
> collect2: ld returned 1 exit status
> -----------------------------------------------------------------------
This is known bug of the TAUCS library provided with CGAL on Linux 64
bits: it is not compatible with shared libraries, thus with the
Polyhedron demo.

The easy solution is to not link with TAUCS: comment out the line
"Find(TAUCS)" in the Polyhedron demo's CMakeLists.txt file.

If you really need to link with TAUCS: add the "-fPIC" compilation
option and recompile TAUCS and third party libraries (Metis + Blas and
Lapack if they are not already installed on you machine, e.g. via a rpm).
> I've also tried compiling the example from the webpage as a stand 
> alone app, and I get:
> -----------------------------------------------------------------------
> main.cpp:(.text._ZN4CGAL12Taucs_solverIdE13factorize_oocEv[CGAL::Taucs_solver<double>::factorize_ooc()]+0x1dd): 
> warning: the use of `tempnam' is dangerous, better use `mkstemp'
> /usr/local/lib/libtaucs.a(taucs_sn_llt_D.o): In function 
> `recursive_supernodal_solve_l':
> taucs_sn_llt.c:(.text+0x4f9): undefined reference to `dtrsm_'
> taucs_sn_llt.c:(.text+0x579): undefined reference to `dgemm_'
> /usr/local/lib/libtaucs.a(taucs_sn_llt_D.o): In function 
> `recursive_supernodal_solve_lt':
>
> ....  and so on
> -----------------------------------------------------------------------
These errors mean that Blas and Lapack are missing.
> I've followed the advice of the forum to go from g77 to gfortran.  
> I've also taken out the g2c from the Tauc library that comes with CGal.
Note about gfortran:
TAUCS and CGAL have only been tested with g77. Unless you really need to
use gfortran, I recommend you to stick to g77. It is easier.
> The gfortran and gcc version I have are 4.3.3.
>
>
> Any help would be greatly appreciated!
>
>
> Thanks,
>
> Frankie
Best regards,
Laurent Saboret



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