build lib and dll with qmake

[fullmetalcoder]

Hmm.. I think it should be created automatically (did you remember about __declspec(dllexport)?), but if it's not the case, read this:
http://support.microsoft.com/kb/131313

the __declspec() stuff is not portable... If you use Qt you should rely on the convinience macros : Q_DECL_EXPORT and Q_DECL_IMPORT instead. The first one has to be set when building a dll and the second one when linking to a dll. They can be managed either by an include file common to all the files of the dll, typically looking like this :

#ifdef _X_BUILD_
 #if (defined(QT_DLL) || defined(QT_SHARED)) && !defined(QT_PLUGIN)
   // lib being compiled shared
  #define X_EXPORT Q_DECL_EXPORT
 #else
  // lib being embedded
  #define X_EXPORT
#else
 // lib being linked against (must be shared on Window$!)
 #define X_EXPORT Q_DECL_IMPORT
#endif

#ifdef _X_BUILD_
 #if (defined(QT_DLL) || defined(QT_SHARED)) && !defined(QT_PLUGIN)
   // lib being compiled shared
  #define X_EXPORT Q_DECL_EXPORT
 #else
  // lib being embedded
  #define X_EXPORT
#else
 // lib being linked against (must be shared on Window$!)
 #define X_EXPORT Q_DECL_IMPORT
#endif

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or inside the projects through the DEFINES variable. In the dll project

DEFINES += -DX_EXPORT=Q_DECL_EXPORT

DEFINES += -DX_EXPORT=Q_DECL_EXPORT

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and in the client project :

DEFINES += -DX_EXPORT=Q_DECL_IMPORT

DEFINES += -DX_EXPORT=Q_DECL_IMPORT

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Then all classes/function/variables meant to be exported (accessible when linking against the lib) have to be prefixed with X_EXPORT (or whatever the name choosen ). For instance :

X_EXPORT void someFunction();
 
class X_EXPORT someClass
{
    public:
         someClass();
}

X_EXPORT void someFunction();

class X_EXPORT someClass
{
    public:
         someClass();
}

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Hope this helps.