Hi All,

I have a Qt based shared library (of our own creation) that I can't build outside of creator in (Windows/MinGW-32 5.3). It works fine (compiles and links) in QtCreator. However, when I attempt to build from the command line using the same qmake project files (qmake/mingw32-make) however when linking the dll, the linker spits out an undefined reference for every single Qt symbol used in my library like so:

Qt Code: 
  1. g++ -Wl,-s -shared -Wl,-subsystem,windows -mthreads -Wl,--out-implib,release\libOslQtCommon.a -o release\OslQtCommon.dll object_script.OslQtCommon.Release  -LD:\workspace-qt\Gordon_v1_0_1_b01\OslCommon\release -lOslCommon -LD:\workspace-qt\Gordon_v1_0_1_b01\IcIface\release -lIcIface -lws2_32 -liphlpapi -LC:\Qt5.7\5.7\mingw53_32\lib C:\Qt5.7\5.7\mingw53_32\lib\libQt5Widgets.a C:\Qt5.7\5.7\mingw53_32\lib\libQt5Gui.a C:\Qt5.7\5.7\mingw53_32\lib\libQt5Ftp.a -LC:\utils\postgresql\pgsql\lib -LC:\utils\my_sql\my_sql\lib C:\Qt5.7\5.7\mingw53_32\lib\libQt5Network.a C:\Qt5.7\5.7\mingw53_32\lib\libQt5SerialPort.a C:\Qt5.7\5.7\mingw53_32\lib\libQt5Core.a 
  2. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0x950): undefined reference to `__imp__ZN7QObjectC2EPS_'
  3. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0x96a): undefined reference to `__imp__ZN7QString13toUtf8_helperERKS_'
  4. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0xa21): undefined reference to `__imp__ZN10QArrayData10deallocateEPS_yy'
  5. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0xa37): undefined reference to `__imp__ZN7QObjectD2Ev'
  6. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0xb94): undefined reference to `__imp__ZN7QObjectD2Ev'
  7. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0xbad): undefined reference to `__imp__ZN10QArrayData10deallocateEPS_yy'
  8. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0xbcd): undefined reference to `__imp__ZN10QArrayData10deallocateEPS_yy'
  9. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0xc55): undefined reference to `__imp__ZN7QString15fromUtf8_helperEPKci'
  10. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0xc8d): undefined reference to `__imp__ZN7QString6appendERKS_'
  11. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0xd2b): undefined reference to `__imp__ZN10QArrayData10deallocateEPS_yy'
  12. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0xd4d): undefined reference to `__imp__ZN10QArrayData10deallocateEPS_yy'
  13. ./obj\oslwavlogger.o:oslwavlogger.cpp:(.text+0xd6d): undefined reference to `__imp__ZN10QArrayData10deallocateEPS_yy'
  14. [... ad infinitum]
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I have compared the linker command used by Creator and it is identical to the one running at the command line except the paths since I'm building to a different location (I'm using a python script to generate the qmake/make cmds with the same options I have in creator). Since everything compiles OK and the linker has no problem finding the library files (all of Qt's .a/dll files) I'm thinking somehow the symbols are not being exported or imported. But as I said, here's no problem building in Creator so I guess this probably means Creator has something in its environment that is missing in my python environment but I can't figure it out. What would cause these (and all Qt symbols) to not get exported (or imported)?

Any ideas?