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I'm trying to link a .dll against a static builld of QuaZip library to get rid of the quazip.dll dependency at runtine. Since I've ran into a dependency conflict at production because a customer is using other third party applications in the same process where my .dll is uncluded, which are also using the quazip.dll but a legacy version. My steps were first to statically compile the zlib dependency as instructed in other posts with the ZLIB_WINAPI flag. Then I compiled QuaZip also with the appropriate ZLIB_WINAPI flag and QUAZIP_STATIC. As zlib.h I have used QtZlib/zlib.h header like in this post recommended. In my .dll project I've also tried to set all the mentioned flags (QUAZIP_STATIC seems to be necessary). Now when I try to compile my .dll I get the following errors

1>quazip.lib(zip.obj) : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "__imp__z_deflate@8" in Funktion "_zipCloseFileInZipRaw64@16".
1>quazip.lib(zip.obj) : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "__imp__z_deflateEnd@4" in Funktion "_zipCloseFileInZipRaw64@16".
1>quazip.lib(zip.obj) : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "__imp__z_crc32@12" in Funktion "_zipWriteInFileInZip@12".
1>quazip.lib(unzip.obj) : error LNK2001: Nicht aufgelöstes externes Symbol "__imp__z_crc32@12".
1>quazip.lib(zip.obj) : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "_imp__z_deflateInit2@32" in Funktion "_zipOpenNewFileInZip4_64@76".
1>quazip.lib(zip.obj) : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "__imp__z_get_crc_table@0" in Funktion "_zipOpenNewFileInZip4_64@76".
1>quazip.lib(unzip.obj) : error LNK2001: Nicht aufgelöstes externes Symbol "__imp__z_get_crc_table@0".
1>quazip.lib(unzip.obj) : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "__imp__z_inflate@8" in Funktion "_unzReadCurrentFile@12".
1>quazip.lib(unzip.obj) : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "__imp__z_inflateEnd@4" in Funktion "_unzCloseCurrentFile@4".
1>quazip.lib(unzip.obj) : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "_imp__z_inflateInit2@16" in Funktion "_unzOpenCurrentFile3@20".

All projects have been build with the /MT flag.

This is my linker command line

/OUT:"builds\qt5\dll\release\.dll" /MANIFEST /NXCOMPAT /PDB:"builds\qt5\dll\release\.pdb" /DYNAMICBASE "qtmain.lib" "Qt5Core.lib" "Qt5Gui.lib" "Qt5Widgets.lib" "Qt5Sql.lib" "Qt5Network.lib" "Qt5PrintSupport.lib" "qwt.lib" "sloperatecppapi.lib" "slgfw.lib" "slgfwwidget.lib" "slcap.lib" "sltrc.lib" "sltrp.lib" "slhmiutilitieslib.lib" "slaesvcadapter.lib" "slfsfilesvcadapter.lib" "sltraceadapter.lib" "slarchiveadapter.lib" "slmd.lib" "slgfwmanager.lib" "slcncversioninfo.lib" "quazip.lib" "setupapi.lib" "wsock32.lib" "ws2_32.lib" "ucrt.lib" "vcruntime.lib" "msvcrt.lib" "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /DLL /MACHINE:X86 /SAFESEH /INCREMENTAL:NO /PGD:"builds\qt5\dll\release<myapplication>.pgd" /SUBSYSTEM:WINDOWS /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"builds\qt5\dll\release<myapplication>.dll.intermediate.manifest" /ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"S:\hmisl\lib" /LIBPATH:"S:\hmisl\siemens\sinumerik\hmi\osal\ace\lib" /LIBPATH:"S:\hmisl\siemens\sinumerik\hmi\osal\qt\lib" /LIBPATH:".\include\qt5\qwt\lib" /LIBPATH:".\include\qt5\quazip\lib" /LIBPATH:".\include\qt5\modbus\lib" /LIBPATH:".\include\qt5\qtsingleapplication\lib\release" /TLBID:1

I would be grateful for any new tip, because I've been trying this for almost a week now and I'm running out of ideas.

odd
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  • You also have to link against the dependencies of the quazip library - in your case zlib. – chehrlic Mar 14 '22 at 12:32
  • @chehrlic thx for your response! I've added zlibstat.lib to the linker input of my project. Unfortunately that had no effect. – odd Mar 14 '22 at 12:55
  • You link dynamically to zlib so linking to the static zlibstat.lib will not help. Don't know how to tell quazip to link statically against zlib – chehrlic Mar 14 '22 at 14:35
  • @chehrlic I think it's done by defining QUAZIP_STATIC and setting the configuration type to static lib – odd Mar 14 '22 at 15:02
  • As a note: "*static .dll*" makes no sense :) . – CristiFati Mar 14 '22 at 20:20
  • @CristiFati yes, you're right. What I was trying to do is to link against a static lib to get rid of the quazip.dll dependency at runtime. I'll correct this. – odd Mar 15 '22 at 11:01

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Ok, three days of agony and I have the solution. I recompiled the zlib, this time not using the provided project file in \contrib\vstudio\vc14, but generating my own with CMake. Then QuaZip linked against it with the flag QUAZIP_STATIC. I then set this flag in my project, which uses QuaZip and linked it against the built quazip.lib and its dependency zlibstatic.lib. Now the library is built into my .dll statically and I no longer have to supply the quazip.dll that caused the conflict.

odd
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