pip install 时报错“unused-command-line-argument-hard-error-in-future”

在我的Mac Air上,用pip安装一些Python库时,偶尔就会遇到一些报错,关于“unused-command-line-argument-hard-error-in-future”,如下:

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 psutil/_psutil_osx.c -o build/temp.macosx-10.9-intel-2.7/psutil/_psutil_osx.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

error: command 'cc' failed with exit status 1

这样的错误,出现次数多了,每次都去google,不如自己记录一下吧。
原因是:The Apple LLVM compiler in Xcode 5.1 treats unrecognized command-line options as errors. This issue has been seen when building both Python native extensions and Ruby Gems, where some invalid compiler options are currently specified.

解决方法:设置ARCHFLAGS参数,如下

参考资料:
http://kaspermunck.github.io/2014/03/fixing-clang-error/

master

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