Re: [Stellarium-pubdevel] Linking error in dynamic plug-ins with a GUI on Windows

[Bogdan M. <dag...@gm...>]

On Wed, Mar 17, 2010 at 1:44 PM, Bogdan Marinov <dag...@gm...> wrote:
> Hello.
>
> As reported by Barry Gerdes, there's a problem with the dynamic
> plug-ins on Windows. If the plug-in contains some references to
> Stellarium's GUI, a linker error is thrown:
>
> D:\Qt\2010.02.1\mingw\bin\g++.exe -enable-runtime-pseudo-reloc
> -Wl,--allow-multiple-definition -shared -o libExampleDialog.dll
> -Wl,--major-image-version,0,--minor-image-version,0
> CMakeFiles\ExampleDialog.dir\ExampleDialog.cpp.obj
> CMakeFiles\ExampleDialog.dir\gui\ExampleDialogWindow.cpp.obj
> CMakeFiles\ExampleDialog.dir\gui\StelDialogExampleDialog.cpp.obj
> CMakeFiles\ExampleDialog.dir\gui\moc_StelDialogExampleDialog.cxx.obj
> CMakeFiles\ExampleDialog.dir\gui\moc_ExampleDialogWindow.cxx.obj
> CMakeFiles\ExampleDialog.dir\moc_ExampleDialog.cxx.obj
> CMakeFiles\ExampleDialog.dir\qrc_exampleDialog.cxx.obj
> -LD:\stellarium\stellarium\builds\msys\src -lstelMain
> D:\Qt\2010.02.1\qt\lib\libQtOpenGLd4.a -lopengl32 -lglu32 -lgdi32
> -luser32 D:\Qt\2010.02.1\qt\lib\libQtGuid4.a -limm32 -lwinmm
> D:\Qt\2010.02.1\qt\lib\libQtNetworkd4.a
> D:\Qt\2010.02.1\qt\lib\libQtCored4.a -lws2_32 -lglu32 -lopengl32
> -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32
> -luuid -lcomdlg32 -ladvapi32
> Info: resolving vtable for StelModule by linking to
> __imp___ZTV10StelModule (auto-import)
> Info: resolving StelApp::singleton by linking to
> __imp___ZN7StelApp9singletonE (auto-import)
> Info: resolving StelMainGraphicsView::singleton by linking to
> __imp___ZN20StelMainGraphicsView9singletonE (auto-import)
> mingw32-make[2]: Leaving directory
> `D:/stellarium/extmodules/ExampleDialog/builds/msys'
> mingw32-make[1]: Leaving directory
> `D:/stellarium/extmodules/ExampleDialog/builds/msys'
> d:/qt/2010.02.1/mingw/bin/../lib/gcc/mingw32/4.4.0/../../../../mingw32/bin/ld.exe:
> warning: auto-importing has been activated without
> --enable-auto-import specified on the command line.
> This should work unless it involves constant data structures
> referencing symbols from auto-imported DLLs.
> CMakeFiles\ExampleDialog.dir\ExampleDialog.cpp.obj:D:/stellarium/extmodules/ExampleDialog/src/ExampleDialog.cpp:98:
> undefined reference to `StelButton::StelButton(QGraphicsItem*, QPixmap
> const&, QPixmap const&, QPixmap const&, QAction*, bool)'
> CMakeFiles\ExampleDialog.dir\ExampleDialog.cpp.obj:D:/stellarium/extmodules/ExampleDialog/src/ExampleDialog.cpp:99:
> undefined reference to `StelGui::getButtonBar()'
> CMakeFiles\ExampleDialog.dir\ExampleDialog.cpp.obj:D:/stellarium/extmodules/ExampleDialog/src/ExampleDialog.cpp:99:
> undefined reference to `BottomStelBar::addButton(StelButton*, QString
> const&, QString const&)'
> CMakeFiles\ExampleDialog.dir\gui\ExampleDialogWindow.cpp.obj:ExampleDialogWindow.cpp:(.text$_ZN8BarFrameC1EP7QWidget[BarFrame::BarFrame(QWidget*)]+0x39):
> undefined reference to `vtable for BarFrame'
> CMakeFiles\ExampleDialog.dir\gui\ExampleDialogWindow.cpp.obj:ExampleDialogWindow.cpp:(.text$_ZN8BarFrameC1EP7QWidget[BarFrame::BarFrame(QWidget*)]+0x43):
> undefined reference to `vtable for BarFrame'
> collect2: ld returned 1 exit status
> mingw32-make[2]: *** [src/libExampleDialog.dll] Error 1
> mingw32-make[1]: *** [src/CMakeFiles/ExampleDialog.dir/all] Error 2
> mingw32-make: *** [all] Error 2
> Exited with code 2.
> Error while building project ExampleDialog
> When executing build step 'Make'
>
> Both KeyBundings and ExampleDialog are affected, which is normal, as
> the former is based on the latter.
>
> Could someone help me with this, please? This effectively limits
> plug-in development on Windows.

I've made a few futile attempts at solving this today. It seems that
it is impossible to link to any classes in the GUI (e.g. StelButton,
BarFrame, StelDialog). Am I missing something obvious?

Bogdan