Create DLL problem

Garthfield

I'm trying to create a windows DLL. I think my custom compilation of QT may be the problem. I compiled QT from scratch as static (added -static compile option), is this the reason why I can't build DLLs?

I followed this YT tutorial to the letter (http://www.youtube.com/watch?v=ZewJ4iHQvXY)

I created a simple project called MyLib (Other Project -> C++ Library) with a single test function:

MyLib.pro
@QT -= gui

TARGET = MyLib
TEMPLATE = lib

DEFINES += MYLIB_LIBRARY

SOURCES += mylib.cpp

HEADERS += mylib.h
MyLib_global.h@

mylib.h
@#ifndef MYLIB_H
#define MYLIB_H

#include "MyLib_global.h"
#include <QDebug>

class MYLIBSHARED_EXPORT MyLib {
public:
MyLib();
void Test();
};

#endif // MYLIB_H@

MyLib_global.h
@#ifndef MYLIB_GLOBAL_H
#define MYLIB_GLOBAL_H

#include <QtCore/qglobal.h>

#if defined(MYLIB_LIBRARY)

define MYLIBSHARED_EXPORT Q_DECL_EXPORT

#else

define MYLIBSHARED_EXPORT Q_DECL_IMPORT

#endif

#endif // MYLIB_GLOBAL_H@

mylib.cpp
@#include "mylib.h"

MyLib::MyLib() {
}

void MyLib::Test() {
qDebug() << "From DLL";
}@

When I build the project only the .a and .o files are created, there's no DLL file being created.

Here's the compile output:
@c:\development\qt\qmake\qmake.exe -spec ........\development\Qt\mkspecs\win32-g++ CONFIG+=declarative_debug -o Makefile MyLib.pro
C:/development/Qt/qtcreator-2.4.1/mingw/bin/mingw32-make.exe -f Makefile.Debug
mingw32-make.exe[1]: Entering directory C:/Users/u100404/Projects/MyLib' g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DMYLIB_LIBRARY -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -I"..\..\..\..\development\Qt\include\QtCore" -I"..\..\..\..\development\Qt\include" -I"..\..\..\..\development\Qt\include\ActiveQt" -I"debug" -I"..\..\..\..\development\Qt\mkspecs\win32-g++" -o debug\mylib.o mylib.cpp ar -ru debug\libMyLib.a debug/mylib.o mingw32-make.exe[1]: Leaving directory C:/Users/u100404/Projects/MyLib'@

Also after compilation QT pops up a dialog box saying there's no executable found and it's prompting me to search for one. But of course there's no executable I'm building a DLL library file!

!http://www.cssmixes.co.uk/images/qt-error.jpg(Could not find executable error)!

dbzhang800

Looks strange ;-)

You get a static library libMyLib.a instead of shared library.

Garthfield

[quote author="1+1=2" date="1339207183"]Looks strange ;-)

You get a static library libMyLib.a instead of shared library.[/quote]

Correct.

Is this because I compiled QT itself as static? it's therefore not capable of producing shared libraries?