cc1: error: unrecognized command line option “-Wno-null-conversion” within installing python-mysql on mac 10.7.5

This error broke my python-mysql installation on Mac 10.7.5. Here are the steps

  1. The installed python is 2.7.1, mysql is 64 bit for 5.6.11.
  2. The being installed python-mysql is 1.2.4, also tried 1.2.3
  3. Configurations for the installation
    1) sudo ln -s /usr/local/mysql/lib /usr/local/mysql/lib/mysql
    2) Edit the and change the following mysql_config.path = "mysql_config" to mysql_config.path = "/usr/local/mysql/bin/mysql_config" 
    3) sudo python build

Here is the stacktrace for build

running build
running build_py
copying MySQLdb/ -> build/lib.macosx-10.7-intel-2.7/MySQLdb
running build_ext
building '_mysql' extension
llvm-gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -pipe -Dversion_info=(1,2,4,'final',1) -D__version__=1.2.4 -I/usr/local/mysql/include -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c _mysql.c -o build/temp.macosx-10.7-intel-2.7/_mysql.o -Wno-null-conversion -Os -g -fno-strict-aliasing -arch x86_64
cc1: error: unrecognized command line option "-Wno-null-conversion"
error: command 'llvm-gcc-4.2' failed with exit status 1

Welcome your suggestions and ideas. Thanks.


Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

Try to Remove cflags -Wno-null-conversion -Wno-unused-private-field in



cflags="-I$pkgincludedir  -Wall   -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space!

Method 2

Wow, I’ve been spending a couple of hours on thistrying to ‘pip install MySQL-python’. I have been re-installing Xcode 4.6.3, the Xcode command line tools seperatly (on Mac OS X 10.7.5), and installing Kenneth Reitz’ stuff ( to no avail while I was …

Altering the cflags options finally helped!


All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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