problem with making mex file

Hello guys, I am new to all this, so please be patient with me!

So I got this library from internet (<http://www.cvlibs.net/software/libelas/>) which is written in C++ but comes with MATLAB wrappers.

I am able to compile the c++ code and run the demo.

But following their guidance to make the Matlab wrapper (by just running 'make'), I get the following error:

Error using mex Undefined symbols for architecture x86_64: "std::__1::__vector_base_common<true>::__throw_length_error() const", referenced from: void std::__1::vector<Elas::triangle, std::__1::allocator<Elas::triangle> >::__push_back_slow_path<Elas::triangle const>(Elas::triangle const&) in elas.o void std::__1::vector<Elas::support_pt, std::__1::allocator<Elas::support_pt> >::__push_back_slow_path<Elas::support_pt const>(Elas::support_pt const&) in elas.o std::__1::vector<Elas::triangle, std::__1::allocator<Elas::triangle> >::vector(std::__1::vector<Elas::triangle, std::__1::allocator<Elas::triangle> > const&) in elas.o std::__1::vector<Elas::support_pt, std::__1::allocator<Elas::support_pt> >::vector(std::__1::vector<Elas::support_pt, std::__1::allocator<Elas::support_pt> > const&) in elas.o "std::__1::locale::use_facet(std::__1::locale::id&) const", referenced from: Elas::process(unsigned char*, unsigned char*, float*, float*, int const*) in elas.o std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*) in elas.o Matrix::getMat(int, int, int, int) in matrix.o Matrix::setMat(Matrix const&, int, int) in matrix.o Matrix::setVal(double, int, int, int, int) in matrix.o Matrix::diag(Matrix const&) in matrix.o Matrix::reshape(Matrix const&, int, int) in matrix.o ... "std::__1::ios_base::getloc() const", referenced from: Elas::process(unsigned char*, unsigned char*, float*, float*, int const*) in elas.o std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*) in elas.o Matrix::getMat(int, int, int, int) in matrix.o Matrix::setMat(Matrix const&, int, int) in matrix.o Matrix::setVal(double, int, int, int, int) in matrix.o Matrix::diag(Matrix const&) in matrix.o Matrix::reshape(Matrix const&, int, int) in matrix.o ... "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__init(unsigned long, char)", referenced from: std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> > std::__1::__pad_and_output<char, std::__1::char_traits<char> >(std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> >, char const*, char const*, char const*, std::__1::ios_base&, char) in elas.o std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> > std::__1::__pad_and_output<char, std::__1::char_traits<char> >(std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> >, char const*, char const*, char const*, std::__1::ios_base&, char) in matrix.o "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_string()", referenced from: std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> > std::__1::__pad_and_output<char, std::__1::char_traits<char> >(std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> >, char const*, char const*, char const*, std::__1::ios_base&, char) in elas.o std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> > std::__1::__pad_and_output<char, std::__1::char_traits<char> >(std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> >, char const*, char const*, char const*, std::__1::ios_base&, char) in matrix.o "std::__1::basic_ostream<char, std::__1::char_traits<char> >::put(char)", referenced from: Elas::process(unsigned char*, unsigned char*, float*, float*, int const*) in elas.o Matrix::getMat(int, int, int, int) in matrix.o Matrix::setMat(Matrix const&, int, int) in matrix.o Matrix::setVal(double, int, int, int, int) in matrix.o Matrix::diag(Matrix const&) in matrix.o Matrix::reshape(Matrix const&, int, int) in matrix.o Matrix::operator+(Matrix const&) in matrix.o ... "std::__1::basic_ostream<char, std::__1::char_traits<char> >::flush()", referenced from: Elas::process(unsigned char*, unsigned char*, float*, float*, int const*) in elas.o Matrix::getMat(int, int, int, int) in matrix.o Matrix::setMat(Matrix const&, int, int) in matrix.o Matrix::setVal(double, int, int, int, int) in matrix.o Matrix::diag(Matrix const&) in matrix.o Matrix::reshape(Matrix const&, int, int) in matrix.o Matrix::operator+(Matrix const&) in matrix.o ... "std::__1::basic_ostream<char, std::__1::char_traits<char> >::sentry::sentry(std::__1::basic_ostream<char, std::__1::char_traits<char> >&)", referenced from: std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*) in elas.o std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*) in matrix.o "std::__1::basic_ostream<char, std::__1::char_traits<char> >::sentry::~sentry()", referenced from: std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*) in elas.o std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*) in matrix.o "std::__1::basic_ostream<char, std::__1::char_traits<char> >::operator<<(int)", referenced from: Matrix::getMat(int, int, int, int) in matrix.o Matrix::setMat(Matrix const&, int, int) in matrix.o Matrix::diag(Matrix const&) in matrix.o Matrix::reshape(Matrix const&, int, int) in matrix.o Matrix::operator+(Matrix const&) in matrix.o Matrix::operator-(Matrix const&) in matrix.o Matrix::operator*(Matrix const&) in matrix.o ... "std::__1::cerr", referenced from: Matrix::getMat(int, int, int, int) in matrix.o Matrix::setMat(Matrix const&, int, int) in matrix.o Matrix::setVal(double, int, int, int, int) in matrix.o Matrix::reshape(Matrix const&, int, int) in matrix.o Matrix::operator+(Matrix const&) in matrix.o Matrix::operator-(Matrix const&) in matrix.o Matrix::operator*(Matrix const&) in matrix.o ... "std::__1::cout", referenced from: Elas::process(unsigned char*, unsigned char*, float*, float*, int const*) in elas.o Matrix::diag(Matrix const&) in matrix.o "std::__1::ctype<char>::id", referenced from: Elas::process(unsigned char*, unsigned char*, float*, float*, int const*) in elas.o std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*) in elas.o Matrix::getMat(int, int, int, int) in matrix.o Matrix::setMat(Matrix const&, int, int) in matrix.o Matrix::setVal(double, int, int, int, int) in matrix.o Matrix::diag(Matrix const&) in matrix.o Matrix::reshape(Matrix const&, int, int) in matrix.o ... "std::__1::locale::~locale()", referenced from: Elas::process(unsigned char*, unsigned char*, float*, float*, int const*) in elas.o std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*) in elas.o Matrix::getMat(int, int, int, int) in matrix.o Matrix::setMat(Matrix const&, int, int) in matrix.o Matrix::setVal(double, int, int, int, int) in matrix.o Matrix::diag(Matrix const&) in matrix.o Matrix::reshape(Matrix const&, int, int) in matrix.o ... "std::__1::ios_base::__set_badbit_and_consider_rethrow()", referenced from: std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_tra

Error in make (line 25) mex('elasMex.cpp','../src/elas.cpp','../src/descriptor.cpp', '../src/filter.cpp', ...

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Is this a linking problem? how can I sort this?

I am using Matlab R2014a, and Mac OSX 10.9.2

Thanks a lot in advance,

Answer 1

[Bruno Pop-Stefanov]

If this is the first time you're using mex you'll have to choose a compiler before being able to use it:

>> mex -setup

Is your installation of MATLAB 64-bit? You can check with

>> mexext

You can compile 64-bit applications if this command returns mexw64 or something similar.

[Farhad B]

thanks for your quick reply, This is my first time using mex, but I had ran

mex -setup

which tells me

MEX configured to use 'Xcode with Clang' for C language compilation.

Also running 'mexext' command returns:

mexmaci64

I reckon that 64 at the end implies 64-bit MATLAB is installed, right?