問題導入子流程32

Question

我正在嘗試通過buildroot在我的python 2.7安裝中安裝subprocess32。 它似乎安裝正確，但是當我將其導入嵌入式系統時出現錯誤：

>>> import subprocess32
/usr/lib/python2.7/site-packages/subprocess32.py:472: RuntimeWarning: The _posixsubprocess module is not being used. Child process reliability may suffer if your pro
gram uses threads.
  "program uses threads.", RuntimeWarning)

按照此路徑，我嘗試導入_posixsubprocess

import _posixsubprocess
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dynamic module does not define init function (init_posixsubprocess)

subprocess32似乎有它自己的版本，在這種情況下不起作用？

這是我的make文件：

#############################################################
#
# Subprocess32 module for python
#
#############################################################

SUBPROCESS32_VERSION = 3.2.7
SUBPROCESS32_SOURCE = subprocess32-$(SUBPROCESS32_VERSION).tar.gz
SUBPROCESS32_SITE = https://pypi.python.org/pypi/subprocess32

SUBPROCESS32_DEPENDENCIES = python

define SUBPROCESS32_BUILD_CMDS
        (cd $(@D); $(HOST_DIR)/usr/bin/python setup.py build)
endef

define SUBPROCESS32_INSTALL_TARGET_CMDS
        (cd $(@D); $(HOST_DIR)/usr/bin/python setup.py install --prefix=$(TARGET_DIR)/usr)
endef

$(eval $(call GENTARGETS,package,subprocess32))

關於此Python錯誤，也有類似的帖子。_posixsubprocess模塊​​未使用，但是答案是注釋中的鏈接已失效。 對我的問題有什么想法嗎？

setup.py：

#!/usr/bin/python

import os
import sys
from distutils.core import setup, Extension


def main():
    if sys.version_info[0] != 2:
        sys.stderr.write('This backport is for Python 2.x only.\n')
        sys.exit(1)

    ext = Extension('_posixsubprocess', ['_posixsubprocess.c'],
                    depends=['_posixsubprocess_helpers.c'])
    if os.name == 'posix':
        ext_modules = [ext]
    else:
        ext_modules = []

    setup(
      name='subprocess32',
      version='3.2.7',
      description='A backport of the subprocess module from Python 3.2/3.3 for use on 2.x.',
      long_description="""
This is a backport of the subprocess standard library module from
Python 3.2 & 3.3 for use on Python 2.
It includes bugfixes and some new features.  On POSIX systems it is
guaranteed to be reliable when used in threaded applications.
It includes timeout support from Python 3.3 but otherwise matches
3.2's API.  It has not been tested on Windows.""",
      license='PSF license',

      maintainer='Gregory P. Smith',
      maintainer_email='greg@krypto.org',
      url='https://github.com/google/python-subprocess32',

      ext_modules=ext_modules,
      py_modules=['subprocess32'],

      classifiers=[
          'Intended Audience :: Developers',
          'Topic :: Software Development :: Libraries',
          'Development Status :: 5 - Production/Stable',
          'License :: OSI Approved :: Python Software Foundation License',
          'Operating System :: POSIX',
          'Operating System :: POSIX :: BSD',
          'Operating System :: POSIX :: Linux',
          'Operating System :: POSIX :: SunOS/Solaris',
          'Programming Language :: Python :: 2.4',
          'Programming Language :: Python :: 2.5',
          'Programming Language :: Python :: 2.6',
          'Programming Language :: Python :: 2.7',
          'Programming Language :: Python :: 2 :: Only',
          'Programming Language :: Python :: Implementation :: CPython',
      ],
    )


if __name__ == '__main__':
    main()

Answer 1

我不確定您使用的是哪個Buildroot版本，但是如果它仍然是使用GENTARGETS宏且沒有python-package基礎結構的版本，則它必須是真的，真的，真的舊版本。 請先升級，因為近年來在Python支持中已進行了許多修復。

Answer 2

問題是distutils使用錯誤的編譯器來構建共享庫（其他對象使用正確的編譯器）。 在構建階段設置下面的LDSHARED變量可以解決此問題：

 LDSHARED="$(TARGET_CC) -pthread -shared"