与BLAS OS X链接

Question

I am currently trying to compile a program using a library that I'm not very familiar with. When I run the compiler, I get the following output/error:

Undefined symbols for architecture x86_64:
  "_cblas_ddot", referenced from:
      shark::LDA::train(shark::LinearClassifier<shark::blas::vector<double> >&, shark::LabeledData<shark::blas::vector<double>, unsigned int> const&) in libshark.a(LDA.cpp.o)
      shark::LDA::train(shark::LinearClassifier<shark::blas::vector<double> >&, shark::WeightedLabeledData<shark::blas::vector<double>, unsigned int> const&) in libshark.a(LDA.cpp.o)

My current idea is that this is from missing BLAS library, which I just downloaded and compiled (from fortran code?).

The command-line arg for compiling looks like thsi

g++ -o example -I/to/boost/include -I/to/shark/include -L/to/boost/lib -L/to/shark/lib -L/to/BLAS -lshark -lblas -l(boost_flags)

In /to/BLAS have a libblas.a , and I ran nm libblas.a which gives a line

libblas.a(ddot.o):
00000000000001c0 s EH_frame1
0000000000000000 T _ddot_

Without being too secure abut this, I assume that this means that the library does have the symbol, but without the _cblas_ prefix.

What can I do from this point? Can I change the symbols name? Or do I need to link this library with something else?

I use OS X Mavericks

Thanks in advance : )

Answer 1

Solution was as suggested by Logicrat, that I needed other files, I downloaded te source code from here and build it with cmake/make very seamless. Linking with the libraries that came from this resolved the issue.

Answer 2

OS X ships with BLAS (including cblas) already installed (it's part of the Accelerate.framework). There's no need to download and build your own. Just link with -lcblas .