[Python-Dev] [Windows] how to prevent the wrong version of zlib1.dll to be used by lib-dynload modules (original) (raw)

Ray Donnelly mingw.android at gmail.com
Tue Jul 24 05:01:15 EDT 2018

MSYS2 has two Python ports, msys2 and mingw-w64. I believe Eric was referring to the mingw-w64 one?

zlib1.dll in C:\Windows\System32 is a packaging error on the part of whatever put it there and that is what needs to be fixed here. ISVs need to stop putting anything in that directory as it leads to the worst form of DLL-hell. You should try to remove that file (back it up as something may break) and just move on with your work in my opinion.

On Tue, Jul 24, 2018 at 8:15 AM, eryk sun <eryksun at gmail.com> wrote:

On Mon, Jul 23, 2018 at 2:31 PM, Eric Le Lay <contact at elelay.fr> wrote:

I encountered a problem with the Windows packaging of gPodder[1] using msys2: Are you using regular Windows Python with msys2, or their custom port? I installed msys2 and used pacman to install Python 3.6. The msys2 environment names libraries with an "msys-" prefix in the "/usr/bin" directory, such as msys-python3.6m.dll, msys-readline7.dll, and msys-z.dll (zlib). This is also the application directory of the msys2 build of Python (i.e. "/usr/bin/python.exe"), so it's the first directory in the default DLL search path (ahead of system directories and PATH). Unlike Windows Python, msys2 Python does not use the alternate search path that replaces the application directory with the DLL directory in the search path. A way to implement this that allows multiple versions of a DLL to be loaded in the same process is to use an assembly that includes the DLL file in its ".manifest" file. Add the assembly to the extension module's #2 manifest (typically embedded, but can be ".2"). The system looks for the "" subdirectory in the module directory. In Windows 7+ you can also add a probing path in a config file (i.e. ".config") [1] that extends the SxS search path with up to 9 relative paths, which can be up to two levels above the module directory (i.e. "...."). [1]: https://docs.microsoft.com/en-us/windows/desktop/SbsCs/application-configuration-files

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