问题
I get the following error trying to install Scrapy in a Mavericks OS.
I have command line tools and X11 installed I don't really know whats going on and I haven`t found the same error browsing through the Web. I think it might be related to some change in Xcode 5.1
Thanks for the answers!
this is part of the command output:
$pip install scrapy
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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
回答1:
It is due to a change in clang defaults in Xcode 5.1 and Apple not noticing that it would break extension module builds using the system Python. One workaround is to define the following environment variables first:
export CFLAGS=-Qunused-arguments
export CPPFLAGS=-Qunused-arguments
UPDATE [2014-05-16]: As expected, Apple has fixed this problem with updated system Pythons (2.7, 2.6, and 2.5) in OS X 10.9.3 so the workaround is no longer necessary when using the latest Mavericks and Xcode 5.1+. However, as of now, the workaround is still required for OS X 10.8.x (Mountain Lion, currently 10.8.5) if you are using Xcode 5.1+ there.
回答2:
The latest version of clang raised to the level of error what used to be a warning. To switch back you can remove this behavior inline right before running your install command:
ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future pip install <your package>
This should work, but just in case something goes wrong, there is more info here: clang error: unknown argument: '-mno-fused-madd' (python package installation failure)
回答3:
Actually Ned's and Dorian's responses are linked:
- Removing the -mno-fused-madd from the _sysconfigdata.py prevents the flags from being passed to the compiler.
- Setting the environment variables tells the compiler to ignore the flags, but the flags are still being passed. This may break in a future release of Xcode.
I just spent DAYS fighting this problem in various packages and, as a Python newbie, couldn't figure out where the flags were coming from. Supplementing Dorian's answer, Xcode 5 supports only Apple's clang compiler and not GCC, but the Python distribution that comes with Mavericks appears to have been built with GCC. The _sysconfigdata.py file contains the flags that were used to build the Python interpreter, and those flags are used by the Python build system by various projects. Therefore any project using the Python build system uses flags that are not compatible with the installed compiler.
I installed python using Homebrew (which puts it into /usr/local/Cellar and used my apple-gcc42 installation also in /usr/local/Cellar) and found that the installed _sysconfigdata.py contains reasonable flags. However, it's still using GCC. You might want to just build Python from sources yourself using clang. I think editing the flags in _sysconfigdata.py is the best way to avoid stepping in this issue repeatedly.
Also remove _sysconfigdata.pyc and _sysconfigdata.pyo.
This is also covered in the following threads:
clang error: unknown argument: '-mno-fused-madd' (python package installation failure) https://discussions.apple.com/thread/5465305
来源：https://stackoverflow.com/questions/22703393/clang-error-unknown-argument-mno-fused-madd-wunused-command-line-argumen