• Ubuntu 14.04.4 LTS
• GCC 4.8.2
• CPython 2.7.6(with cffi 1.5.2), pypy 5.0.1 (with built-in cffi)

• Implement a simple function as: int mysum(int a, int b) in ./clib/mysum.c

• Complie mysum.c into static lib libmysum.a

  cd clib
  gcc -c mysum.c
  ar -crv libmysum.a mysum.o
  

• Write a testing program in C to link with libmysum.a

  • Build testing executable from clib/test_mysum.c

    gcc ./test_mysum.c -lmysum -L./
    

  • Run it (You should see 1+2=3 printed)

    ./a.out
    

• With pypy

  cd ..
  [path]/pypy ./mysum_build.py
  

  File _mysum.pypy-41.so should be generated at current directory which can be imported by python code;

• With CPython

  cd ..
  [path]/python ./mysum_build.py
  

  File _mysum.so should be generated at current directory which can be imported by python code;

• With pypy

  [path]/pypy ./test_mysum.py
  

• With CPython

  [path]/python ./test_mysum.py
  

You should get 1+2=3 printed.