“cc”失败，退出状态为1“安装python库时出错

Question

像许多其他人一样，我在安装一个python库（作为tar下载，然后解压）时遇到问题。

rodolphe-mbp:python-Levenshtein-0.11.2 Rodolphe$ sudo python setup.py install
running install
running bdist_egg
running egg_info
writing requirements to python_Levenshtein.egg-info/requires.txt
writing python_Levenshtein.egg-info/PKG-INFO
writing namespace_packages to python_Levenshtein.egg-info/namespace_packages.txt
writing top-level names to python_Levenshtein.egg-info/top_level.txt
writing dependency_links to python_Levenshtein.egg-info/dependency_links.txt
writing entry points to python_Levenshtein.egg-info/entry_points.txt
reading manifest file 'python_Levenshtein.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching '*' under directory 'docs'
warning: no previously-included files matching '*pyc' found anywhere in distribution
warning: no previously-included files matching '.project' found anywhere in distribution
warning: no previously-included files matching '.pydevproject' found anywhere in distribution
writing manifest file 'python_Levenshtein.egg-info/SOURCES.txt'
installing library code to build/bdist.macosx-10.9-intel/egg
running install_lib
running build_ext
building 'Levenshtein' extension
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 Levenshtein.c -o build/temp.macosx-10.9-intel-2.7/Levenshtein.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

如其他地方所建议的，我尝试在终端中输入“ARCHFLAGS=-Wno error=unused command line argument hard error in future sudo python setup.py install”，但没有成功。

有没有办法解决xcode 5.1中出现的这个问题？

Answer 1

在构建之前，请在shell中运行以下两行：

export CFLAGS=-Qunused-arguments
export CPPFLAGS=-Qunused-arguments

这些导出告诉编译器忽略未使用的参数，而不是抱怨它们。

---

原因似乎是Python正在使用它构建时使用的选项编译模块，但其中一个选项在mavericks中不再工作：

the clang 3.4 Apple is shipping defaults to erroring on unknown flags, but CPython builds modules using the same set of flags it was compiled with originally.

（发件人：https://stackoverflow.com/a/22315129/65295）

很多人都会遇到这种情况：

• Ansible Installation -clang: error: unknown argument: '-mno-fused-madd'
• Can't install python mysql library on Mac Mavericks
• clang error: unknown argument: '-mno-fused-madd' (python package installation failure)

Answer 2

使用安装（在您下拉的程序文件夹内）

sudo -E python setup.py install

完成了任务！

Answer 3

对我来说，问题是我刚刚升级了XCode，需要安装命令行工具（参见this answer）。

运行xcode-select --install之后，我的python库安装得很好。