CGAL users discussion list

[Joachim Reichel <>]

Hi,

>      I have a problem to use mex in matlab to compile the "mexfile.cpp" in
> attachment. In matlab command windows, I use the following command:
> 
>>> mex mexfile.cpp
> -I/usr/include/:/usr/local/include/:/opt/matlab/extern/include/
> -L/usr/lib/:/usr/local/lib/:/opt/matlab/extern/lib/glnxa64
> 
> 
> My CGAL and gmp install location is /usr/include/  and /usr/lib,   my boost
> location is /usr/local/include/  and /usr/local/lib/
> 
> But  I can't complie it, can you give me some suggestion about it?  Thanks
> very much!
> The compile result is following:*
> 
> 
> Warning: You are using gcc version "4.4.3-4ubuntu5)".  The version
>          currently supported with MEX is "4.2.3".
>          For a list of currently supported compilers see:
>          http://www.mathworks.com/support/compilers/current_release/
> 
> mexfile.o: In function `CGAL::Handle_for<CGAL::Gmpq_rep,
> std::allocator<CGAL::Gmpq_rep> >::~Handle_for()':
> mexfile.cpp:(.text._ZN4CGAL10Handle_forINS_8Gmpq_repESaIS1_EED2Ev[CGAL::Handle_for<CGAL::Gmpq_rep,
> std::allocator<CGAL::Gmpq_rep> >::~Handle_for()]+0x18): undefined reference
> to `__gmpq_clear'
> mexfile.o: In function `boost::operator-(CGAL::Gmpq const&, CGAL::Gmpq
> const&)':
> mexfile.cpp:(.text._ZN5boostmiERKN4CGAL4GmpqES3_[boost::operator-(CGAL::Gmpq
> const&, CGAL::Gmpq const&)]+0x3e): undefined reference to `__gmpq_init'
> mexfile.cpp:(.text._ZN5boostmiERKN4CGAL4GmpqES3_[boost::operator-(CGAL::Gmpq
> const&, CGAL::Gmpq const&)]+0x60): undefined reference to `__gmpq_sub'
> mexfile.o: In function `boost::operator*(CGAL::Gmpq const&, CGAL::Gmpq
> const&)':
> mexfile.cpp:(.text._ZN5boostmlERKN4CGAL4GmpqES3_[boost::operator*(CGAL::Gmpq
> const&, CGAL::Gmpq const&)]+0x3e): undefined reference to `__gmpq_init'
> mexfile.cpp:(.text._ZN5boostmlERKN4CGAL4GmpqES3_[boost::operator*(CGAL::Gmpq
> const&, CGAL::Gmpq const&)]+0x60): undefined reference to `__gmpq_mul'
> mexfile.o: In function `CGAL::Same_uncertainty_nt<CGAL::Sign,
> CGAL::Gmpq>::type CGAL::orientationC2<CGAL::Gmpq>(CGAL::Gmpq const&,
> CGAL::Gmpq const&, CGAL::Gmpq const&, CGAL::Gmpq const&, CGAL::Gmpq const&,
> CGAL::Gmpq const&)':
> [...]

It seems that you do not link with the used libraries. You need at least 
-lCGAL,
maybe also -lboost or -lgmp.

If it still does not work please show the linker command that is executed. I
don't know the mex tool, but I guess it has a mode that echoes the executed
commands.

Joachim