rennat rennat - 5 months ago 36
MySQL Question

Python: MySQLdb and "Library not loaded: libmysqlclient.16.dylib"

The setup...



Trying to set up a clean Mac os X 10.6 install to develop python/django and I didn't remember running into this on 10.5.

After installing MySQL from the installer on
mysql-5.5.8-osx10.6-x86_64.dmg
I ran

$ sudo pip install MySQL-python


and it seemed to go smoothly (output below)

Downloading/unpacking MySQL-python
Downloading MySQL-python-1.2.3.tar.gz (70Kb): 70Kb downloaded
Running setup.py egg_info for package MySQL-python
warning: no files found matching 'MANIFEST'
warning: no files found matching 'ChangeLog'
warning: no files found matching 'GPL'
Installing collected packages: MySQL-python
Running setup.py install for MySQL-python
building '_mysql' extension
gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -pipe -Dversion_info=(1,2,3,'final',0) -D__version__=1.2.3 -I/usr/local/mysql/include -I/System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6 -c _mysql.c -o build/temp.macosx-10.6-universal-2.6/_mysql.o -Os -g -fno-common -fno-strict-aliasing -arch x86_64
In file included from _mysql.c:36:
/usr/local/mysql/include/my_config.h:325:1: warning: "SIZEOF_SIZE_T" redefined
In file included from /System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/Python.h:9,
from pymemcompat.h:10,
from _mysql.c:29:
/System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/pymacconfig.h:33:1: warning: this is the location of the previous definition
In file included from _mysql.c:36:
/usr/local/mysql/include/my_config.h:419:1: warning: "HAVE_WCSCOLL" redefined
In file included from /System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/Python.h:8,
from pymemcompat.h:10,
from _mysql.c:29:
/System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/pyconfig.h:803:1: warning: this is the location of the previous definition
gcc-4.2 -Wl,-F. -bundle -undefined dynamic_lookup build/temp.macosx-10.6-universal-2.6/_mysql.o -L/usr/local/mysql/lib -lmysqlclient_r -lpthread -o build/lib.macosx-10.6-universal-2.6/_mysql.so -arch x86_64
warning: no files found matching 'MANIFEST'
warning: no files found matching 'ChangeLog'
warning: no files found matching 'GPL'
Successfully installed MySQL-python
Cleaning up...


after this I tried:

$ python -c "import MySQLdb"


and it crapped out on me with:

Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/Library/Python/2.6/site-packages/MySQLdb/__init__.py", line 19, in <module>
import _mysql
ImportError: dlopen(/Library/Python/2.6/site-packages/_mysql.so, 2): Library not loaded: libmysqlclient.16.dylib
Referenced from: /Library/Python/2.6/site-packages/_mysql.so
Reason: image not found


So on to my question...



What did I do wrong?/What else do I need to do?

Googling (and searching here) for this returns a lot of results getting this error message with Ruby not too many with Python tho.

Answer

_mysql.so refers to libmysqlclient.16.dylib. That is, the shared library that serves as the bridge between Python and the MySQL client library, _mysql.so, refers to the dynamic library for the MySQL client library, and that library cannot be loaded for some reason.

Questions you need to answer:

  • Is there a libmysqlclient.16.dylib anywhere on your system? If not, you need to install the MySQL client software.
  • If so, is the directory containing that library in your DYLD_LIBRARY_PATH setting? If not, try adding it.
  • If so, you'll have to ensure that the libmysqlclient.16.dylib file is not corrupt. My copy, installed in /opt/local/lib/mysql5/mysql/libmysqlclient.16.dylib, courtesy of MacPorts, has MD5 signature c79ee91af08057dfc269ee212915801a and is 1,462,376 bytes in size. What does your copy look like?
Comments