Question

尝试在Mavericks OS中安装Scrapy时出现以下错误。

我安装了命令行工具和X11我真的不知道发生了什么事，我没有发现浏览网页的同样错误。我认为这可能与Xcode 5.1中的一些变化有关。

感谢您的回答！

这是命令输出的一部分：

$ pip install scrapy

.
.
.
.

Downloading/unpacking cryptography>=0.2.1 (from pyOpenSSL->scrapy)
  Downloading cryptography-0.3.tar.gz (208kB): 208kB downloaded
  Running setup.py egg_info for package cryptography
    OS/X: confusion between 'cc' versus 'gcc' (see issue 123)
    will not use '__thread' in the C code
    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
    Traceback (most recent call last):
      File "<string>", line 16, in <module>
      File "/Users/agonzamart/.virtualenvs/Parser/build/cryptography/setup.py", line 156, in <module>
        "test": PyTest,
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 112, in setup
        _setup_distribution = dist = klass(attrs)
      File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/dist.py", line 265, in __init__
        self.fetch_build_eggs(attrs.pop('setup_requires'))
      File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/dist.py", line 289, in fetch_build_eggs
        parse_requirements(requires), installer=self.fetch_build_egg
      File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/pkg_resources.py", line 618, in resolve
        dist = best[req.key] = env.best_match(req, self, installer)
      File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/pkg_resources.py", line 862, in best_match
        return self.obtain(req, installer) # try and download/install
      File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/pkg_resources.py", line 874, in obtain
        return installer(requirement)
      File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/dist.py", line 339, in fetch_build_egg
        return cmd.easy_install(req)
      File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 623, in easy_install
        return self.install_item(spec, dist.location, tmpdir, deps)
      File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 653, in install_item
        dists = self.install_eggs(spec, download, tmpdir)
      File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 849, in install_eggs
        return self.build_and_install(setup_script, setup_base)
      File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1130, in build_and_install
        self.run_setup(setup_script, setup_base, args)
      File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1118, in run_setup
        raise DistutilsError("Setup script exited with %s" % (v.args[0],))
    distutils.errors.DistutilsError: Setup script exited with error: command 'cc' failed with exit status 1
    Complete output from command python setup.py egg_info:
    OS/X: confusion between 'cc' versus 'gcc' (see issue 123)

will not use '__thread' in the C code

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

Traceback (most recent call last):

  File "<string>", line 16, in <module>

  File "/Users/agonzamart/.virtualenvs/Parser/build/cryptography/setup.py", line 156, in <module>

    "test": PyTest,

  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 112, in setup

    _setup_distribution = dist = klass(attrs)

  File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/dist.py", line 265, in __init__

    self.fetch_build_eggs(attrs.pop('setup_requires'))

  File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/dist.py", line 289, in fetch_build_eggs

    parse_requirements(requires), installer=self.fetch_build_egg

  File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/pkg_resources.py", line 618, in resolve

    dist = best[req.key] = env.best_match(req, self, installer)

  File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/pkg_resources.py", line 862, in best_match

    return self.obtain(req, installer) # try and download/install

  File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/pkg_resources.py", line 874, in obtain

    return installer(requirement)

  File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/dist.py", line 339, in fetch_build_egg

    return cmd.easy_install(req)

  File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 623, in easy_install

    return self.install_item(spec, dist.location, tmpdir, deps)

  File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 653, in install_item

    dists = self.install_eggs(spec, download, tmpdir)

  File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 849, in install_eggs

    return self.build_and_install(setup_script, setup_base)

  File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1130, in build_and_install

    self.run_setup(setup_script, setup_base, args)

  File "/Users/agonzamart/.virtualenvs/Parser/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1118, in run_setup

    raise DistutilsError("Setup script exited with %s" % (v.args[0],))

distutils.errors.DistutilsError: Setup script exited with error: command 'cc' failed with exit status 1

----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in /Users/agonzamart/.virtualenvs/Parser/build/cryptography

Answer 1

这是由于clang中Xcode 5.1默认值发生变化而Apple没有注意到它会使用系统Python破坏扩展模块构建。一种解决方法是首先定义以下环境变量：

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

更新[2014-05-16]：正如预期的那样，Apple已经使用OS X 10.9.3中更新的系统Pythons（2.7,2.6和2.5）解决了这个问题，因此在使用最新的Mavericks时不再需要解决方法和Xcode 5.1+。但是，截至目前，如果您在OS X 10.8.x使用Xcode 5.1+，则{{1}}（Mountain Lion，目前为10.8.5）仍需要解决方法。

Answer 2

最新版本的clang 升级到错误级别以前曾是警告。要切换回来，您可以在运行安装命令之前直接删除此行为：

ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future pip install <your package>

这应该有用，但万一出现问题，这里有更多信息：clang error: unknown argument: '-mno-fused-madd' (python package installation failure)

Answer 3

实际上Ned和Dorian的回答是相互关联的：

从_sysconfigdata.py中删除-mno-fused-madd可防止将标志传递给编译器。
设置环境变量会告诉编译器忽略标志，但仍然会传递标志。这可能会在Xcode的未来版本中出现。

我只是花了DAYS在各种软件包中解决这个问题，作为一个Python新手，无法弄清楚这些标志的来源。补充Dorian的答案，Xcode 5只支持Apple的clang编译器而不支持GCC，但是Mavericks附带的Python发行版似乎是用GCC构建的。 _sysconfigdata.py文件包含用于构建Python解释器的标志，这些标志由Python构建系统由各种项目使用。因此，使用Python构建系统的任何项目都使用与已安装的编译器不兼容的标志。

我使用Homebrew安装了python（将它放入/ usr / local / Cellar并在/ usr / local / Cellar中使用了我的apple-gcc42安装），发现安装的_sysconfigdata.py包含合理的标志。但是，它仍在使用GCC。您可能希望使用clang自己从源代码构建Python。我认为编辑_sysconfigdata.py中的标志是避免重复踩到这个问题的最佳方法。

同时删除_sysconfigdata.pyc和_sysconfigdata.pyo。

以下主题还包括这一点：

clang error: unknown argument: '-mno-fused-madd' (python package installation failure) https://discussions.apple.com/thread/5465305

clang：错误：未知参数：'-mno-fused-madd'[-Wunused-command-line-argument-hard-error-in-future]

3 个答案: