What am I missing? Unresolved externals

**derick** · 12th February 2006, 21:46

Hi,

In porting to Qt4 I'm finally linking but run into unresolved externals:

Qt Code:

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link /LIBPATH:"C:\Qt\4.0.1\lib" /NOLOGO /DEBUG /DEBUG /DLL /LIBPATH:../xpaf /LIBPATH:../xpaf xpaf-sdk.lib /LIBPATH:..
/xpaf-sdk/debug /LIBPATH:../../lua-5.0.2/lib ../../lua-5.0.2/lib\lualib.lib C:\Qt\4.0.1\lib\QtCored4.lib C:\Qt\4.0.1\lib\QtGu
id4.lib C:\Qt\4.0.1\lib\Qt3Supportd4.lib C:\Qt\4.0.1\lib\QtSqld4.lib C:\Qt\4.0.1\lib\QtXmld4.lib /OUT:"debug\xpaf-sdkgui.dll"
 @C:\temp\nmCE6.tmp
   Creating library debug\xpaf-sdkgui.lib and object debug\xpaf-sdkgui.exp
moc_ezSessionApp.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const ezCrm::ezBase::stat
icMetaObject" (?staticMetaObject@ezBase@ezCrm@@2UQMetaObject@@B)
...
...
ezModelGui.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const layerModel::ezBCModel_RTa
ble_Control::staticMetaObject" (?staticMetaObject@ezBCModel_RTable_Control@layerModel@@2UQMetaObject@@B)
debug\xpaf-sdkgui.dll : fatal error LNK1120: 59 unresolved externals
NMAKE : fatal error U1077: 'link' : return code '0x460'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\Bin\nmake.exe"' : return code '0x2'
Stop.

link /LIBPATH:"C:\Qt\4.0.1\lib" /NOLOGO /DEBUG /DEBUG /DLL /LIBPATH:../xpaf /LIBPATH:../xpaf xpaf-sdk.lib /LIBPATH:..
/xpaf-sdk/debug /LIBPATH:../../lua-5.0.2/lib ../../lua-5.0.2/lib\lualib.lib C:\Qt\4.0.1\lib\QtCored4.lib C:\Qt\4.0.1\lib\QtGu
id4.lib C:\Qt\4.0.1\lib\Qt3Supportd4.lib C:\Qt\4.0.1\lib\QtSqld4.lib C:\Qt\4.0.1\lib\QtXmld4.lib /OUT:"debug\xpaf-sdkgui.dll"
 @C:\temp\nmCE6.tmp
   Creating library debug\xpaf-sdkgui.lib and object debug\xpaf-sdkgui.exp
moc_ezSessionApp.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const ezCrm::ezBase::stat
icMetaObject" (?staticMetaObject@ezBase@ezCrm@@2UQMetaObject@@B)
...
...
ezModelGui.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const layerModel::ezBCModel_RTa
ble_Control::staticMetaObject" (?staticMetaObject@ezBCModel_RTable_Control@layerModel@@2UQMetaObject@@B)
debug\xpaf-sdkgui.dll : fatal error LNK1120: 59 unresolved externals
NMAKE : fatal error U1077: 'link' : return code '0x460'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\Bin\nmake.exe"' : return code '0x2'
Stop.

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I have

Qt Code:

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// Win 32 DLL export macros
#ifdef WIN32
# ifdef BUILD_DLL
#  define XPAF_DLL_EXPORT  __declspec(dllexport)
# else
#  define XPAF_DLL_EXPORT  // Empty
# endif
#endif // WIN32

// Win 32 DLL export macros
#ifdef WIN32
# ifdef BUILD_DLL
#  define XPAF_DLL_EXPORT  __declspec(dllexport)
# else
#  define XPAF_DLL_EXPORT  // Empty
# endif
#endif // WIN32

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and

Qt Code:

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namespace layerModel {
 
class XPAF_DLL_EXPORT ezBCModel_RItem: public ezBCModelBase
{
	Q_OBJECT
public:
	ezBCModel_RItem(ezModelRender *aParent, QString aName=0);
	~ezBCModel_RItem(void);
};
...
namespace layerModel {
..
class XPAF_DLL_EXPORT ezBCModel_RTable: public ezBCModel_RItem
{
	Q_OBJECT
public:
	ezBCModel_RTable(ezModelRender *aParent, QString aName=0);
	~ezBCModel_RTable(void);
};

namespace layerModel {

class XPAF_DLL_EXPORT ezBCModel_RItem: public ezBCModelBase
{
	Q_OBJECT
public:
	ezBCModel_RItem(ezModelRender *aParent, QString aName=0);
	~ezBCModel_RItem(void);
};
...
namespace layerModel {
..
class XPAF_DLL_EXPORT ezBCModel_RTable: public ezBCModel_RItem
{
	Q_OBJECT
public:
	ezBCModel_RTable(ezModelRender *aParent, QString aName=0);
	~ezBCModel_RTable(void);
};

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What am I missing? Namepace messing the name mangling

DLL_EXPORT

Any pointers appreciated!!

**jacek** · 12th February 2006, 22:13

Does appropriate moc_*.cpp file contains the definition of layerModel::ezBCModel_RTable_Control::staticMetaOb ject?

**derick** · 12th February 2006, 22:22

In moc_ezBCModel_RTable.cpp:

Qt Code:

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const QMetaObject layerModel::ezBCModel_RTable_Control::staticMetaObject = {
    { &ezBCModel_RItem_Control::staticMetaObject, qt_meta_stringdata_layerModel__ezBCModel_RTable_Control,
      qt_meta_data_layerModel__ezBCModel_RTable_Control, 0 }
};

const QMetaObject layerModel::ezBCModel_RTable_Control::staticMetaObject = {
    { &ezBCModel_RItem_Control::staticMetaObject, qt_meta_stringdata_layerModel__ezBCModel_RTable_Control,
      qt_meta_data_layerModel__ezBCModel_RTable_Control, 0 }
};

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**jacek** · 12th February 2006, 22:39

Do you link your application with moc_ezBCModel_RTable.obj?

**derick** · 12th February 2006, 22:55

Yup.. it gets linked into the DLL:

Qt Code:

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Creating temporary file "C:\temp\RSP00007A.rsp" with contents
[
/OUT:"debug\xpaf-sdk.dll" /NOLOGO /LIBPATH:"C:\Derick\projects\xpaf\xpaf-sdk\debug" /LIBPATH:"C:\Qt\4.0.1\lib" /DLL /DEBUG /SUBSYSTEM:WINDOWS /LIBPATH:../xpaf /LIBPATH:../xpaf /LIBPATH:../../lua-5.0.2/lib ../../lua-5.0.2/lib\lualib.lib C:\Qt\4.0.1\lib\QtCored4.lib C:\Qt\4.0.1\lib\QtGuid4.lib C:\Qt\4.0.1\lib\QtSqld4.lib C:\Qt\4.0.1\lib\QtXmld4.lib C:\Qt\4.0.1\lib\Qt3Supportd4.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
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBBase.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCAucLot.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCBase.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCContact.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_BC.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_DTable.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_Entity.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_RItem.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_RScreen.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_RTable.obj"

Creating temporary file "C:\temp\RSP00007A.rsp" with contents
[
/OUT:"debug\xpaf-sdk.dll" /NOLOGO /LIBPATH:"C:\Derick\projects\xpaf\xpaf-sdk\debug" /LIBPATH:"C:\Qt\4.0.1\lib" /DLL /DEBUG /SUBSYSTEM:WINDOWS /LIBPATH:../xpaf /LIBPATH:../xpaf /LIBPATH:../../lua-5.0.2/lib ../../lua-5.0.2/lib\lualib.lib C:\Qt\4.0.1\lib\QtCored4.lib C:\Qt\4.0.1\lib\QtGuid4.lib C:\Qt\4.0.1\lib\QtSqld4.lib C:\Qt\4.0.1\lib\QtXmld4.lib C:\Qt\4.0.1\lib\Qt3Supportd4.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
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBBase.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCAucLot.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCBase.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCContact.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_BC.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_DTable.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_Entity.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_RItem.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_RScreen.obj"
"\Derick\projects\xpaf\tmp\xpaf-sdk\ezBCModel_RTable.obj"

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**derick** · 12th February 2006, 23:03

Found something:

After undefining XPAF_DLL_EXPORT the unresolved externals went away...

Is there a difference in Qt4? I think I read somewhere that the moc now understands macro expantions....

**wysota** · 13th February 2006, 01:05

Does that class of yours inherit QObject?

**derick** · 13th February 2006, 23:37

Yes they do.

When I build the DLL my classes are not exported. I even tried to export my classes with:

# define XPAF_DLL_EXPORT Q_DECL_EXPORT
and
# define XPAF_DLL_EXPORT __declspec(dllexport)

Anything that I should try with QT4?

**derick** · 13th February 2006, 23:39

Does anybody have some sample classes exported in external DLLs? Please

My code compiles but I get an error as my DLL does not show the exported classes. Or do we need to load DEF files?

**wysota** · 13th February 2006, 23:40

Check Qt4 sources

**derick** · 14th February 2006, 00:03

Maybe a more specific hint

.. I only found some specific macros for plugins.

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