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2020年02月16日 | 交叉编译Python-2.7.13到ARM（aarch32）—— 支持sqlite3

2020-02-16 来源：eefocus

环境

主机： ubuntu14.04 64bit

开发板： qemu + vexpress-a9 （参考： http://www.cnblogs.com/pengdonglin137/p/6442583.html）

工具链： arm-none-linux-gnueabi-gcc (gcc version 4.8.3 20140320)

Python版本： Python-2.7.13

前面一篇博文（交叉编译Python-2.7.13到ARM（aarch32）平台）介绍了移植python到aarch32上面，但是发现有很多模块都不能用，可以在板子上面执行下面的命令测试一下：

1 [root@vexpress ]# python /usr/lib/python2.7/test/test___all__.py

2 Traceback (most recent call last):

3 File "/usr/lib/python2.7/test/test___all__.py", line 3, in

4 import unittest

5 File "/usr/lib/python2.7/unittest/__init__.py", line 58, in

6 from .result import TestResult

7 File "/usr/lib/python2.7/unittest/result.py", line 9, in

8 from . import util

9 File "/usr/lib/python2.7/unittest/util.py", line 2, in

10 from collections import namedtuple, OrderedDict

11 File "/usr/lib/python2.7/collections.py", line 20, in

12 from _collections import deque, defaultdict

13 ImportError: No module named _collections

可以看到这里找不到_collections模块。

对比x86_64的编译结果：

1 ls x86_64/build/lib.linux-x86_64-2.7/

2 array.so* _codecs_hk.so* cPickle.so* _curses_panel.so* future_builtins.so* itertools.so* mmap.so* parser.so* _socket.so* _sysconfigdata.py time.so*

3 audioop.so* _codecs_iso2022.so* crypt.so* _curses.so* grp.so* _json.so* _multibytecodec.so* pyexpat.so* spwd.so* _sysconfigdata.pyc unicodedata.so*

4 binascii.so* _codecs_jp.so* cStringIO.so* datetime.so* _hashlib.so* linuxaudiodev.so* _multiprocessing.so* _random.so* _sqlite3.so* _sysconfigdata.pyo zlib.so*

5 _bisect.so* _codecs_kr.so* _csv.so* _elementtree.so* _heapq.so* _locale.so* nis.so* readline.so* _ssl.so* syslog.so*

6 cmath.so* _codecs_tw.so* _ctypes.so* fcntl.so* _hotshot.so* _lsprof.so* operator.so* resource.so* strop.so* termios.so*

7 _codecs_cn.so* _collections.so* _ctypes_test.so* _functools.so* _io.so* math.so* ossaudiodev.so* select.so* _struct.so* _testcapi.so*

而aarch32的编译结果：

1 $ls aarch32/build/lib.linux2-arm-2.7/

2 audioop.so* _codecs_iso2022.so* _codecs_tw.so* _ctypes.so* _elementtree.so* _json.so* mmap.so* nis.so* resource.so* termios.so*

3 _codecs_cn.so* _codecs_jp.so* crypt.so* _ctypes_test.so* future_builtins.so* linuxaudiodev.so* _multibytecodec.so* parser.so* _sysconfigdata.py _testcapi.so*

4 _codecs_hk.so* _codecs_kr.so* _csv.so* datetime.so* _hotshot.so* _lsprof.so* _multiprocessing.so* pyexpat.so* _sysconfigdata.pyc

可以看到，aarch32上面缺少了很多库，比如_collections.so，将来这些库会被安装到/usr/lib/python2.7/lib-dynload下面，所以下面要说的就是将缺少的这些库弄回来！

正文

1、通过分析setup.py发现问题

在函数build_extensions中刚开始self.extensions中存放的是需要编译库，通过在加打印：

1 diff --git a/setup.py b/setup.py

2 index 54054c2..bc16bb1 100644

3 --- a/setup.py

4 +++ b/setup.py

5 @@ -178,6 +178,7 @@ class PyBuildExt(build_ext):

7 def build_extensions(self):

9 + print "build_extensions enter."

10 # Detect which modules should be compiled

11 missing = self.detect_modules()

13 @@ -191,6 +192,9 @@ class PyBuildExt(build_ext):

14 extensions.append(ctypes)

15 self.extensions = extensions

17 + for ext in self.extensions:

18 + print "extensions: ", ext.name

19 +

20 # Fix up the autodetected modules, prefixing all the source files

21 # with Modules/ and adding Python's include directory to the path.

22 (srcdir,) = sysconfig.get_config_vars('srcdir')

23 @@ -217,6 +221,8 @@ class PyBuildExt(build_ext):

24 # Python header files

25 headers = [sysconfig.get_config_h_filename()]

26 headers += glob(os.path.join(sysconfig.get_path('include'), "*.h"))

27 +

28 + print "builtin_module_names: ", sys.builtin_module_names

29 for ext in self.extensions[:]:

30 ext.sources = [ find_module_file(filename, moddirlist)

31 for filename in ext.sources ]

32 @@ -248,10 +254,15 @@ class PyBuildExt(build_ext):

33 remove_modules.append(line[0])

34 input.close()

36 + print "remove_modules: ", remove_modules

37 +

38 for ext in self.extensions[:]:

39 if ext.name in remove_modules:

40 self.extensions.remove(ext)

42 + for ext in self.extensions[:]:

43 + print "extensions: ", ext.name

44 +

45 # When you run "make CC=altcc" or something similar, you really want

46 # those environment variables passed into the setup.py phase. Here's

47 # a small set of useful ones.

48 @@ -1618,13 +1629,13 @@ class PyBuildExt(build_ext):

51 # Platform-specific libraries

52 - if host_platform == 'linux2':

53 + if host_platform == 'linux2' or host_platform == 'linux2-arm':

54 # Linux-specific modules

55 exts.append( Extension('linuxaudiodev', ['linuxaudiodev.c']) )

56 else:

57 missing.append('linuxaudiodev')

59 - if (host_platform in ('linux2', 'freebsd4', 'freebsd5', 'freebsd6',

60 + if (host_platform in ('linux2','linux2-arm' 'freebsd4', 'freebsd5', 'freebsd6',

61 'freebsd7', 'freebsd8')

62 or host_platform.startswith("gnukfreebsd")):

63 exts.append( Extension('ossaudiodev', ['ossaudiodev.c']) )

64 @@ -1755,6 +1766,10 @@ class PyBuildExt(build_ext):

65 ## ext = Extension('xx', ['xxmodule.c'])

66 ## self.extensions.append(ext)

68 +# print "missing: ", missing

69 +# for ext in self.extensions:

70 +# print "extensions: ", ext.name

71 +

72 return missing

74 def detect_tkinter_explicitly(self):

75 @@ -2229,6 +2244,8 @@ Topic :: Software Development

76 """

78 def main():

79 + print "sys.path: ", sys.path

80 + print "cross_compiling: ", cross_compiling

81 # turn off warnings when deprecated modules are imported

82 import warnings

83 warnings.filterwarnings("ignore",category=DeprecationWarning)

然后执行./mk2_make.sh可以看到：

1 sys.path: ['/home/pengdonglin/src/qemu/python_cross_compile/Python-2.7.13', '/home/pengdonglin/src/qemu/python_cross_compile/aarch32/build/lib.linux2-arm-2.7', '/home/pengdonglin/src/qemu/python_cross_compile/Python-2.7.13/Lib', '/home/pengdonglin/src/qemu/python_cross_compile/Python-2.7.13/Lib/plat-linux2', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload']

交叉编译 Python-2 7 13 ARM aarch32 sqlite3

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