CODEWITHSUNDEEP
pythonclinuxgcccython
Jer J
Jer J

Reputation: 85

Cython fails to compile, /usr/bin/ld: cannot find

Running into error stating: 

/usr/bin/ld: cannot find -lnumsolver
collect2: error: ld returned 1 exit status
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

Upon running: 

from distutils.core import setup
from distutils.extension import Extension
from Cython.Build import cythonize

setup(
ext_modules = cythonize(Extension("cy_rbisect",
            ["cy_rbisect.pyx"],
            library_dirs=['../clib'],
            libraries=['numsolver']))
)

My 'library files' are numsolver.h, numsolver.c, numsolver.o, numsolver.so

with Cython files: cy_rbisect.pxd, cy_rbisect.pyx.

I've already run the export LD_LIBRARY_PATH='/path/to/numsolver.so' so I'm not sure where I'm going wrong here... My code did work previously but then I renamed all the files updated the header/c/pyx/pxd files respectively and re-compiled. It hasn't been working since.

Upvotes: 2

Views: 1961

Answers (1)

Pablo
Pablo

Reputation: 13570

EDIT

I haven't used cython myself, but I found this: Using Cython To Link Python To A Shared Library

This might help you write your correct setup.py with your custom shared library. My old answer was targeted for a general solution as to how to compile and link shared libraries.

(old answer)

How are you compiling your library? For the linker to find your library in a non standard path, you have to use -L option. So the gcc command should look like this:

gcc <your *.o files> <your other options> -L /path/to/ -lnumsolver

LD_LIBRARY_PATH must have the directory path of where your library is found. And the filename has to begin with lib. So rename your so file to /path/to/libnumsolver.so and set LD_LIBRARY_PATH='/path/to/. This variable should be used when you are trying to execute your code.

Take a look at Shared libraries with GCC on Linux

Upvotes: 1

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