MS Visual C++ Linker warnings

[YuriyRusinov]

Hello, All !

I develop class library for linux and windows. Here is headers files
searchengine.h

#ifdef WIN32
    #define SEARCH_EXPORT __declspec(dllexport)
#else
    #define SEARCH_EXPORT
#endif
 
class SearchForm;
 
class SEARCH_EXPORT SearchEngine : public QObject
{
    public:
        SearchEngine (QObject *parent=0);
        ...
        static SearchEngine* GUISetParams (QWidget *parent=0, Qt::WFlags f=0);
        ...
    private:
        SearchForm *sForm;
        ...
    private:
        Q_OBJECT
};

#ifdef WIN32
    #define SEARCH_EXPORT __declspec(dllexport)
#else
    #define SEARCH_EXPORT
#endif

class SearchForm;

class SEARCH_EXPORT SearchEngine : public QObject
{
    public:
        SearchEngine (QObject *parent=0);
        ...
        static SearchEngine* GUISetParams (QWidget *parent=0, Qt::WFlags f=0);
        ...
    private:
        SearchForm *sForm;
        ...
    private:
        Q_OBJECT
};

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searchform.h

class SearchEngine;
 
class SearchForm : public QDialog
{
    public:
        SearchForm (SearchEngine *se, QWidget *parent=0, Qt::WFlags f=0);
        ...
    private:
        SearchEngine *sEngine;
        ...
    private:
        Q_OBJECT
};

class SearchEngine;

class SearchForm : public QDialog
{
    public:
        SearchForm (SearchEngine *se, QWidget *parent=0, Qt::WFlags f=0);
        ...
    private:
        SearchEngine *sEngine;
        ...
    private:
        Q_OBJECT
};

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Sources files are
searchengine.cpp

#include "searchengine.h"
#include "searchform.h"
 
SEARCH_EXPORT SearchEngine * SearchEngine::self=0;
 
SearchEngine::SearchEngine (QObject *parent)
    : QObject (parent)
{
};
...
SearchEngine* SearchEngine::GUISetParams (QWidget *parent, Qt::WFlags f)
{
    SearchEngine *se = new SearchEngine ();
    se->sForm = new SearchForm (se);
    se->sForm->show ();
    return se;
}

#include "searchengine.h"
#include "searchform.h"

SEARCH_EXPORT SearchEngine * SearchEngine::self=0;

SearchEngine::SearchEngine (QObject *parent)
    : QObject (parent)
{
};
...
SearchEngine* SearchEngine::GUISetParams (QWidget *parent, Qt::WFlags f)
{
    SearchEngine *se = new SearchEngine ();
    se->sForm = new SearchForm (se);
    se->sForm->show ();
    return se;
}

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searchform.cpp

SearchForm (SearchEngine *se, QWidget *parent, Qt::WFlags f) :
    QDialog (parent,f ),
    sEngine (se)
{
...
}
...

SearchForm (SearchEngine *se, QWidget *parent, Qt::WFlags f) :
    QDialog (parent,f ),
    sEngine (se)
{
...
}
...

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When I try to build project under Linux, all works fine, but if I try to do it under Windows, I receive some linkage warnings such this

searchform.obj : warning LNK4217: locally defined symbol ?setTimeRange@SearchEngine@@QAEXABVQDateTime@@0@Z (public: void __thiscall SearchEngine::setTimeRange(class QDateTime const &,class QDateTime const &)) imported in function "private: void __thiscall SearchForm::Search(void)" (?Search@SearchForm@@AAEXXZ)
...

function SearchEngine::setTimeRange (const QDateTime&, const QDateTime&) and others are defined in searchengine.cpp. Where is the troubles and which way I have to solve this problem ?

Thanks in advance.