The C extension compilation fails on Mac OS X Mavericks

[christophercrouzet]

When I try to install the library through setup.py on Mac OS X Mavericks (10.9.2), the C extension won't compile as per the log below.

< christopher ~/src/3rdparty/wrapt > sudo python setup.py install
running install
running build
running build_py
creating build
creating build/lib.macosx-10.9-intel-2.7
creating build/lib.macosx-10.9-intel-2.7/wrapt
copying src/__init__.py -> build/lib.macosx-10.9-intel-2.7/wrapt
copying src/arguments.py -> build/lib.macosx-10.9-intel-2.7/wrapt
copying src/decorators.py -> build/lib.macosx-10.9-intel-2.7/wrapt
copying src/importer.py -> build/lib.macosx-10.9-intel-2.7/wrapt
copying src/six.py -> build/lib.macosx-10.9-intel-2.7/wrapt
copying src/wrappers.py -> build/lib.macosx-10.9-intel-2.7/wrapt
running build_ext
building 'wrapt._wrappers' extension
creating build/temp.macosx-10.9-intel-2.7
creating build/temp.macosx-10.9-intel-2.7/src
cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -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 -arch x86_64 -arch i386 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/_wrappers.c -o build/temp.macosx-10.9-intel-2.7/src/_wrappers.o
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
***************************************************************************

WARNING: The C extension component for wrapt could not be compiled.

INFO: Trying to build without extensions.

***************************************************************************
running install
running build
running build_py
creating build/lib
creating build/lib/wrapt
copying src/__init__.py -> build/lib/wrapt
copying src/arguments.py -> build/lib/wrapt
copying src/decorators.py -> build/lib/wrapt
copying src/importer.py -> build/lib/wrapt
copying src/six.py -> build/lib/wrapt
copying src/wrappers.py -> build/lib/wrapt
running install_lib
creating /Library/Python/2.7/site-packages/wrapt
copying build/lib/wrapt/__init__.py -> /Library/Python/2.7/site-packages/wrapt
copying build/lib/wrapt/arguments.py -> /Library/Python/2.7/site-packages/wrapt
copying build/lib/wrapt/decorators.py -> /Library/Python/2.7/site-packages/wrapt
copying build/lib/wrapt/importer.py -> /Library/Python/2.7/site-packages/wrapt
copying build/lib/wrapt/six.py -> /Library/Python/2.7/site-packages/wrapt
copying build/lib/wrapt/wrappers.py -> /Library/Python/2.7/site-packages/wrapt
byte-compiling /Library/Python/2.7/site-packages/wrapt/__init__.py to __init__.pyc
byte-compiling /Library/Python/2.7/site-packages/wrapt/arguments.py to arguments.pyc
byte-compiling /Library/Python/2.7/site-packages/wrapt/decorators.py to decorators.pyc
byte-compiling /Library/Python/2.7/site-packages/wrapt/importer.py to importer.pyc
byte-compiling /Library/Python/2.7/site-packages/wrapt/six.py to six.pyc
byte-compiling /Library/Python/2.7/site-packages/wrapt/wrappers.py to wrappers.pyc
running install_egg_info
Writing /Library/Python/2.7/site-packages/wrapt-1.8.0-py2.7.egg-info
***************************************************************************

WARNING: The C extension component for wrapt could not be compiled.

INFO: Only pure Python version of package installed.

***************************************************************************

[GrahamDumpleton]

If using MacOS X OS supplied Python version, it is the fault of Apple. Upgrading to MacOS X 10.9.3 will resolve the issue.

If you are using a third party Python installation, the issue is with that Python installation and that would need to be fixed. You would likely have this issue when building any Python package with a C extension component.

A workaround you can try is documented in:

• http://mygeekdaddy.net/2014/03/19/quick-fix-to-pip-install-error/

In short, try installing 'wrapt' using the command:

ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future pip install wrapt

There is an Apple knowledge base article about it somewhere, but I can't find it right now.

[GrahamDumpleton]

Here is the Apple documentation about it:

• https://developer.apple.com/library/ios/releasenotes/developertools/rn-xcode/xc5_release_notes/xc5_release_notes.html

[christophercrouzet]

Thanks!