[Mingw-users] linking problem (Windows dll to MinGW app)

[Thomas S. <tks...@gm...>]

Maybe someone here can solve my problem, which may be elementary. I have a
native Windows dll, built by me with msvc, that I wish to link to a Qt app
built on MinGW with Qt 4.6 Open Source.  Everything looks OK, but the link
fails.

The Makefile for this build was generated by qmake.  The output for the
linking step follows:

  g++ -enable-stdcall-fixup -Wl,-enable-auto-import
-Wl,-enable-runtime-pseudo-
reloc -mthreads -Wl -Wl,-subsystem,windows -o    debug/gPpDemo.exe
object_script.gPpDemo.Debug -L'c:/Qt/2010.02.1/qt/lib' -lopengl32 -lglu32
-lgdi32 -luser32 -lmingw32 -lqtmaind   -LC:/videoDev/gPp/gPpDemo -lDVPump
-lQtOpenGLd4 -lQtGuid4 -lQtCored4
  mingw32-make[1]: Leaving directory `C:/videoDev/gPp/gPpDemo'
  mingw32-make: Leaving directory `C:/videoDev/gPp/gPpDemo'
  ./debug/dvpump.o: In function `Z9getDVPumpv':
  C:\videoDev\gPp\gPpDemo/dvpump.cpp:21: undefined reference to
`DVP_RegisterSink'
  collect2: ld returned 1 exit status
  mingw32-make[1]: *** [debug/gPpDemo.exe] Error 1
  mingw32-make: *** [debug] Error 2

My import library name (DVPump) is indeed in the command line, and ld must
have found it else there would be a 'library not found' error.  Moreover nm
reports that _DVP_RegisterSink is indeed an entry point in DVPump.lib and an
external reference in dvpump.o.  So I am stuck.

Thanks, Tom