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This is 2 separate errors in single question. I followed the docs on Cython website on how to build a cython script. I Created .pyx file, did cython -a filename.pyx --embed to create .c file and then

import pyximport; pyximport.install()
import filename

to run my simple hello world program.

Now I want to implement cython on Random Forest and I use the following modules while importing : 

from __future__ import division
from sklearn.ensemble import RandomForestClassifier
import pymysql
import datetime
import csv
from operator import itemgetter
from sklearn.metrics import *
from algoScore import algo_score
import sys

When I try to do cython -a randomforest.pyx ** is showed some errors regarding **numpy so I thought since numpy used c headers, I need to build using distutils by providing include_path in setup.py (Following this link) and the following is my setup.py :

from distutils.core import setup
from Cython.Build import cythonize
import numpy

setup(
    name = "Test script",
    ext_modules = cythonize('randomforest.pyx', include_path = [numpy.get_include()]),  # accepts a glob pattern
)

when I try building the file from command line by following command :

python setup.py build_ext --inplace

I get following errors :

running build_ext
building 'randomforest' extension
c:\mingw\bin\gcc.exe -mdll -O -Wall -IC:\Python27\include -IC:\Python27\PC -c randomforest.c -o build\temp.win32-2.7\Release\randomforest.o
writing build\temp.win32-2.7\Release\randomforest.def
c:\mingw\bin\gcc.exe -shared -s build\temp.win32-2.7\Release\randomforest.o build\temp.win32-2.7\Release\randomforest.def -LC:\Python27\libs -LC:\Python27\PCbuild -lpython27 -lmsvcr90 -o "e:\PA - Project\CodeBase\Tests\balanceClasses\balanceClasses\RF\randomforest.pyd"
C:\Python27\libs/libpython27.a(dmmes00976.o):(.idata$7+0x0): undefined reference to `_head_C__build27_cpython_PCBuild_libpython27_a'
C:\Python27\libs/libpython27.a(dmmes00239.o):(.idata$7+0x0): undefined reference to `_head_C__build27_cpython_PCBuild_libpython27_a'
C:\Python27\libs/libpython27.a(dmmes00236.o):(.idata$7+0x0): undefined reference to `_head_C__build27_cpython_PCBuild_libpython27_a'
C:\Python27\libs/libpython27.a(dmmes00245.o):(.idata$7+0x0): undefined reference to `_head_C__build27_cpython_PCBuild_libpython27_a'
C:\Python27\libs/libpython27.a(dmmes00343.o):(.idata$7+0x0): undefined reference to `_head_C__build27_cpython_PCBuild_libpython27_a'
C:\Python27\libs/libpython27.a(dmmes00386.o):(.idata$7+0x0): more undefined references to `_head_C__build27_cpython_PCBuild_libpython27_a' follow
collect2: ld returned 1 exit status
error: command 'c:\\mingw\\bin\\gcc.exe' failed with exit status 1

Also, though error are generated, I do get a .c file generated and .def & .o files as well.

I want to know weather the file is compiler? Can I run it from pyximport by importing or not? And also, if I can't then is there any specific way to compile the .c file using any compiler into standalone .exe?

I tried using VC++ command line by compiler /c and I had faced the issue as described in following link (Edit 1).

Would be grateful if someone an help me as I've been facing this since long and even googling doesn't seem to give any answer.

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Debasish Kanhar
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1 Answers1

1

I got a similar error message when I tried to build simple "hello world" program (http://omake.accense.com/static/doc-ja/cython/src/quickstart/build.html) with cython and cygwin GCC.

In my case, using VC compiler solved this problem.

1)Install Visual C++ for Python from Microsoft(http://www.microsoft.com/en-us/download/details.aspx?id=44266)

2)Add its installed registry to PATH (install registry was C:\Program Files (x86)\Common Files\Microsoft\Visual C++ for Python in my environment)

3)Create config file (C:\Python27\Lib\distutils\distutils.cfg). Then write following text in it.

[build_ext]
compiler=msvc

4)Then compile with cython.

python setup.py build_ext --inplace
Kosuke Akimoto
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