Issue781614
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Created on 2003-08-01 17:04 by robind, last changed 2022-04-10 16:10 by admin. This issue is now closed.
Messages (8) | |||
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msg17564 - (view) | Author: Robin Dunn (robind) | Date: 2003-08-01 17:04 | |
Hi, The PCbuild/readme.txt says this: ''' XXX We're actually linking against Release_static\libdb41s.lib. XXX This yields the following warnings: """ Compiling... _bsddb.c Linking... Creating library ./_bsddb.lib and object ./_bsddb.exp LINK : warning LNK4049: locally defined symbol "_malloc" imported LINK : warning LNK4049: locally defined symbol "_free" imported LINK : warning LNK4049: locally defined symbol "_fclose" imported LINK : warning LNK4049: locally defined symbol "_fopen" imported _bsddb.pyd - 0 error(s), 4 warning(s) """ XXX This isn't encouraging, but I don't know what to do about it. ''' The cause of this is the fact that libdb41s.lib is built with the flags for using the "Multithreaded" C RTL but Python uses the "MUltithreaded DLL" C RTL. In other words, libdb is specifying that the C RTL should be linked statically but Python wants to link to it statically. To avoid these warnings the instructions can be changed to specify that the builder should change the flags in the Berkeley_DB project. Also you should probably link with the Debug_static\libdb41sd.lib when building the debug version of Python. |
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msg17565 - (view) | Author: Martin v. Löwis (loewis) * | Date: 2003-08-01 19:50 | |
Logged In: YES user_id=21627 Can you propose a specific patch? Also, it would be preferable if changing the source code of the Sleepycat distribution would not be necessary. |
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msg17566 - (view) | Author: Tim Peters (tim.peters) * | Date: 2004-02-16 23:54 | |
Logged In: YES user_id=31435 Thomas, you have any insight into this one? |
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msg17567 - (view) | Author: Thomas Heller (theller) * | Date: 2004-02-18 17:41 | |
Logged In: YES user_id=11105 It looks to me like we could link to the import library build_win32\Release\libdb41.lib instead of the static library build_win32\Release_static\libdb41s.lib. The former is built with 'multithreaded dll' flags. The downside is that libdb41.dll plus MSVCP60.DLL would have to be distributed. Are the linker warnings a real problem, or only cosmetical? Of course we have to update the build procedure for 2.4 anyway... |
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msg17568 - (view) | Author: Martin v. Löwis (loewis) * | Date: 2004-02-18 19:58 | |
Logged In: YES user_id=21627 I think we should avoid linking with the DLL if possible; in some application context, it may be impossible to find the DLL dynamically, or there might be confusion which DLL to load. The linker warning means that there is a conflict between the static (libc.a) and dynamic (msvcr71.dll) version of _free, etc, which potentially means that we are linking conflicting copies of the CRT, which is potentially dangerous. |
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msg17569 - (view) | Author: Thomas Heller (theller) * | Date: 2004-02-18 20:18 | |
Logged In: YES user_id=11105 Potentially dangerous - of course. The question is whether this is responsible for some bugs or not. If we cannot link to the DLL then we have to change the build settings for the static builds of libdb41s.lib. |
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msg17570 - (view) | Author: Gregory P. Smith (gregory.p.smith) * | Date: 2006-04-12 20:50 | |
Logged In: YES user_id=413 I believe BerkeleyDB 4.4 when compiled on windows uses the multithreaded DLL C RTL by default even for its static library now so this error should go away? i think this problem is gone for the latest BerkeleyDB and is just a PCbuild readme.txt documentation problem for older BerkeleyDB versions. in the past for stand alone pybsddb bsddb3 packages i always had to change the static build settings of BerkeleyDB to use multi-threaded DLL code generation (/MD flag on cl.exe). With 4.4 i didn't need to do that. (note we weren't linking with the berkeleydb DLL; its the berkeleydb static library, its just that a python extension module is a DLL so the static library code needed to use the same memory model) |
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msg17571 - (view) | Author: Martin v. Löwis (loewis) * | Date: 2006-04-13 05:11 | |
Logged In: YES user_id=21627 Right. This problem was fixed with r43002. |
History | |||
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Date | User | Action | Args |
2022-04-10 16:10:27 | admin | set | github: 38995 |
2003-08-01 17:04:02 | robind | create |