[Coin-discuss] Symbol not found loading libCoinMP from Python ctypes

[Joshua Arnott]

Hello,

I’m trying to use the CoinMP library from Python 3 via ctypes. When I try to load the shared library I get the following error:

Python 3.4.1 (default, May 19 2014, 13:10:29) 
[GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import ctypes
>>> lib = ctypes.CDLL('libCoinMP.dylib')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/Cellar/python3/3.4.1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/ctypes/__init__.py", line 351, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: dlopen(libCoinMP.dylib, 6): Symbol not found: _CbcOrClpRead_mode
  Referenced from: /usr/local/lib/libCoinMP.dylib
  Expected in: flat namespace
 in /usr/local/lib/libCoinMP.dylib

However, when I “make test” everything runs correctly.

Output from “nm” reports the symbol is undefined:

U _CbcOrClpRead_mode

I am getting similar errors for the other libraries, e.g.:

Python 3.4.1 (default, May 19 2014, 13:10:29) 
[GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import ctypes
>>> ctypes.CDLL('libClp.dylib')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/Cellar/python3/3.4.1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/ctypes/__init__.py", line 351, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: dlopen(libClp.dylib, 6): Symbol not found: __ZN18CoinMessageHandler13checkSeverityEv
  Referenced from: /usr/local/lib/libClp.dylib
  Expected in: flat namespace
 in /usr/local/lib/libClp.dylib

Running Mac OS X 10.9.5, with current CoinMP from SVN.

Kind regards,

Josh
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