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我使用Yocto在Ubuntu x86，Raspberry Pi，BeagleBone Black和TI AM57XX EVM（Dev Kit）上構建和安裝Python和python-twisted。除了AM57XX開發工具包之外，Python-Twisted沒有導入所有上述機器的問題。它吐出以下錯誤的：如何讓Yocto構建模塊fcntl作爲Python的一部分構建
Python 2.7.11 (default, Aug 7 2017, 12:07:27)
[GCC 5.3.1 20160113] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from txdbus import client,error
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/site-packages/txdbus/client.py", line 11, in <module>
from twisted.internet import defer, reactor
File "/usr/lib/python2.7/site-packages/twisted/internet/reactor.py", line 39, in <module>
File "/usr/lib/python2.7/site-packages/twisted/internet/epollreactor.py", line 405, in install
File "/usr/lib/python2.7/site-packages/twisted/internet/epollreactor.py", line 235, in __init__
File "/usr/lib/python2.7/site-packages/twisted/internet/base.py", line 498, in __init__
File "/usr/lib/python2.7/site-packages/twisted/internet/posixbase.py", line 289, in installWaker
File "/usr/lib/python2.7/site-packages/twisted/internet/posixbase.py", line 139, in __init__
File "/usr/lib/python2.7/site-packages/twisted/internet/fdesc.py", line 25, in setNonBlocking
AttributeError: 'NoneType' object has no attribute 'fcntl'
如果我發動對板Python和嘗試導入的fcntl模塊，它確實是丟失：
Python 2.7.11 (default, Aug 7 2017, 12:07:27)
[GCC 5.3.1 20160113] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> import fcntl
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named fcntl
軟件包列表是每臺機器上相同。我錯過了什麼？內核是否需要配置不同？
雖然我是谷歌搜索的時候，我發現這個職位： https://lists.yoctoproject.org/pipermail/yocto/2013-May/013953.html
這似乎表明，Python從Yocto有一個問題，是錯誤配置，使其不包括的fcntl模塊：
>> ImportError: No module named fcntl
>> ========
>>
>> So it looks like the Python included with the SDK is crippled or mis-configured:
>
> Yeah, the Python we build is split up massively, so clearly the SDK is
> missing the packages that are needed to run bitbake. But as I said,
> using our SDK to build is over-complicating things as Ubuntu should
> work fine. What problems were you seeing?
當Yocto構建的Python的腳本log.do_package提到了蟒蛇-的fcntl需要的依賴 - 但他們似乎並不像錯誤：
log.do_package:DEBUG: runstrip: 'arm-linux-gnueabihf-strip' --remove-section=.comment --remove-section=.note --strip-unneeded '/home/me/am57xx/build/tmp-external-linaro-toolchain/work/armv7ahf-neon-linux-gnueabi/python/2.7.11-r1/package/usr/lib/python2.7/lib-dynload/fcntl.so'
log.do_package:DEBUG: LIBNAMES: pkg python-fcntl libs 0 bins 0 sonames []
log.do_package:DEBUG: calculating shlib provides for python-fcntl
log.do_package:DEBUG: LIBNAMES: pkg python-fcntl sonames []
log.do_package:DEBUG: calculating shlib requirements for python-fcntl
log.do_package:DEBUG: python-fcntl: Dependency libpython2.7.so.1.0 requires package libpython2 (used by files: /home/me/am57xx/build/tmp-external-linaro-toolchain/work/armv7ahf-neon-linux-gnueabi/python/2.7.11-r1/packages-split/python-fcntl/usr/lib/python2.7/lib-dynload/fcntl.so)
log.do_package:DEBUG: python-fcntl: Dependency libc.so.6 requires package external-linaro-toolchain (used by files: /home/me/am57xx/build/tmp-external-linaro-toolchain/work/armv7ahf-neon-linux-gnueabi/python/2.7.11-r1/packages-split/python-fcntl/usr/lib/python2.7/lib-dynload/fcntl.so)
log.do_package.17147:DEBUG: runstrip: 'arm-linux-gnueabihf-strip' --remove-section=.comment --remove-section=.note --strip-unneeded '/home/me/am57xx/build/tmp-external-linaro-toolchain/work/armv7ahf-neon-linux-gnueabi/python/2.7.11-r1/package/usr/lib/python2.7/lib-dynload/fcntl.so'
log.do_package.17147:DEBUG: LIBNAMES: pkg python-fcntl libs 0 bins 0 sonames []
log.do_package.17147:DEBUG: calculating shlib provides for python-fcntl
log.do_package.17147:DEBUG: LIBNAMES: pkg python-fcntl sonames []
log.do_package.17147:DEBUG: calculating shlib requirements for python-fcntl
log.do_package.17147:DEBUG: python-fcntl: Dependency libpython2.7.so.1.0 requires package libpython2 (used by files: /home/me/am57xx/build/tmp-external-linaro-toolchain/work/armv7ahf-neon-linux-gnueabi/python/2.7.11-r1/packages-split/python-fcntl/usr/lib/python2.7/lib-dynload/fcntl.so)
log.do_package.17147:DEBUG: python-fcntl: Dependency libc.so.6 requires package external-linaro-toolchain (used by files: /home/me/am57xx/build/tmp-external-linaro-toolchain/work/armv7ahf-neon-linux-gnueabi/python/2.7.11-r1/packages-split/python-fcntl/usr/lib/python2.7/lib-dynload/fcntl.so)
log.do_populate_sysroot:DEBUG: runstrip: 'arm-linux-gnueabihf-strip' --remove-section=.comment --remove-section=.note --strip-unneeded '/home/me/am57xx/build/tmp-external-linaro-toolchain/work/armv7ahf-neon-linux-gnueabi/python/2.7.11-r1/sysroot-destdir/usr/lib/python2.7/lib-dynload/fcntl.so'
log.do_populate_sysroot.17148:DEBUG: runstrip: 'arm-linux-gnueabihf-strip' --remove-section=.comment --remove-section=.note --strip-unneeded '/home/me/am57xx/build/tmp-external-linaro-toolchain/work/armv7ahf-neon-linux-gnueabi/python/2.7.11-r1/sysroot-destdir/usr/lib/python2.7/lib-dynload/fcntl.so'
所以我認爲它構建了模塊，但無法將其打包到我的根文件系統中。
我下載了Python源代碼，並運行「help」配置並搜索了fcntl。
./configure --help | grep fcntl
但是，沒有結果！
我可以對我的Yocto配置或Python配方做些什麼來將fcntl部署到根文件系統？
'./configure --help | grep fcntl'不應該產生任何結果。你可以'貓配置| grep fcntl'和'cat setup.py | grep fcntl'，但我不知道它有多相關。我知道_Yocto_蹲坐，但是你有訪問_Python_生成日誌嗎？如何構建目錄（檢查_fcntl.so_是否存在）？ – CristiFati