Liblinear on mac osx 10.9.3

Question

Environment : Matlab R2014a (8.3), Macosx mavericks 10.9.3, Apple LLVM version 5.1 (clang-503.0.40)

I am compiling the liblinear package from http://www.csie.ntu.edu.tw/~cjlin/liblinear/. I fixed the mexopts.h in the matlab installation directory to point to right SDKROOT, C and CXX. When I run make from inside matlab under the director liblinear-1.94/matlab/, the libsvmread and libsvmwrite successfully generated the mexmaci64 library. However, it did not generate for train and predict. Hence I commented the try catch expection in the make, to understand the error. Now I getting the following error.

Error using mex  
Undefined symbols for architecture x86_64:  
"_daxpy_", referenced from:  
  TRON::tron(double*) in tron.o  
  TRON::trcg(double, double*, double*, double*) in tron.o  
"_ddot_", referenced from:  
  TRON::tron(double*) in tron.o
  TRON::trcg(double, double*, double*, double*) in tron.o
"_dnrm2_", referenced from:
  TRON::tron(double*) in tron.o
  TRON::trcg(double, double*, double*, double*) in tron.o
"_dscal_", referenced from:
  TRON::trcg(double, double*, double*, double*) in tron.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)


Error in make (line 16)
    mex CFLAGS="\$CFLAGS -std=c99 -v" -largeArrayDims train.c
            linear_model_matlab.c ../linear.cpp ../tron.cpp
            "../blas/*.c"

Any idea why am I getting this error?

Answer 1

Dylib in x86_64

First of all, let's make sure that the liblinear (or whichever library that you are linking to) dylib is in x86_64, or at least universal (i386 + x86_64) format.

$ file /usr/local/Cellar/liblinear/1.94/lib/liblinear.dylib /usr/local/Cellar/liblinear/1.94/lib/liblinear.dylib: Mach-O 64-bit dynamically linked shared library x86_64

If you install your libraries via Homebrew, this should not be a problem.

GNU Libtool

Another instance where I frequently see the ld: symbol(s) not found for architecture x86_64 is when I compile node.js modules using GNU's libtool. If you install GNU Libtool, try uninstalling/unlinking it

Answer 2

It looks like the program is looking for the files in the blas folder.

I got the exact same error when trying to add liblinear manually to my c++ using cmake (with the new ranksvm- so I couldn't brew) . I solved this by adding the .o AND the blas/.o files as sources to my project.

...using this as an analogy perhaps you only included the liblinear folder and not the folder and all its contents in your Matlab project?