在OSX 10.6上导入Python Sybase模块时未定义的符号

我试图让python-sybase模块在OSX 10.6上工作,但我遇到了一些麻烦.

当我做

import Sybase

我明白了

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "Sybase.py", line 15, in <module>
    from sybasect import *
ImportError: dlopen(/Library/Python/2.6/site-packages/python_sybase-0.40pre2-py2.6-macosx-10.6-universal.egg/sybasect.so, 2): Symbol not found: _blk_alloc
  Referenced from: /Library/Python/2.6/site-packages/python_sybase-0.40pre2-py2.6-macosx-10.6-universal.egg/sybasect.so
  Expected in: flat namespace
 in /Library/Python/2.6/site-packages/python_sybase-0.40pre2-py2.6-macosx-10.6-universal.egg/sybasect.so

我看了一下sybasect.so,果然,_blk_alloc是未定义的.该函数位于已安装的Sybase的sybblk.dylib中,其包含的目录位于LD_LIBRARY_PATH中.

当我使用python setup.py build编译python-sybase时,gcc命令似乎可以正确找到所有正确的库,但由于某些原因,在将sybasect.so安装到Python模块目录后,这些库似乎没有链接.

gcc命令是

gcc-4.2 -Wl,-F. -bundle -undefined dynamic_lookup -arch i386 -arch ppc -arch x86_64 build/temp.macosx-10.6-universal-2.6/blk.o build/temp.macosx-10.6-universal-2.6/databuf.o build/temp.macosx-10.6-universal-2.6/cmd.o build/temp.macosx-10.6-universal-2.6/conn.o build/temp.macosx-10.6-universal-2.6/ctx.o build/temp.macosx-10.6-universal-2.6/datafmt.o build/temp.macosx-10.6-universal-2.6/iodesc.o build/temp.macosx-10.6-universal-2.6/locale.o build/temp.macosx-10.6-universal-2.6/msgs.o build/temp.macosx-10.6-universal-2.6/numeric.o build/temp.macosx-10.6-universal-2.6/money.o build/temp.macosx-10.6-universal-2.6/datetime.o build/temp.macosx-10.6-universal-2.6/date.o build/temp.macosx-10.6-universal-2.6/sybasect.o -L/Applications/Sybase/System/OCS-15_0/lib -lsybblk -lsybct -lsybcs -lsybtcl -lsybcomn -lsybintl -lsybunic -o build/lib.macosx-10.6-universal-2.6/sybasect.so

-L / Applications / Sybase / System / OCS-15_0 / lib位置正确,该文件夹包含所有正确的.dylib.

当我运行otool时,输出是：

$otool -L build/lib.macosx-10.6-universal-2.6/sybasect.so
build/lib.macosx-10.6-universal-2.6/sybasect.so:
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.11)

我期待在那里看到Sybase库.

我对Mac上的链接有点新意.如何确保sybasect.so引用Sybase库？

解决方法:

固定它.

问题是我链接的各种Sybase库只有32位,但我在64位模式下运行Python.修复程序只是在32位模式下运行python.

我使用命令defaults write com.apple.versioner.python Prefer-32-Bit -bool yes,因为我对64位模式没有任何特殊需要.

标签：python,dynamic-linking,macos,sybase,dylib
来源： https://codeday.me/bug/20190709/1407733.html