QT Projects Organization & Link Static Library

Dong

Hi All !

I have a big project and I want to organize it by separate it in to multi projects

This is the structure of my Projects Tree

MyApplication (SubDirs)
    Framework (SubDirs)
        DynamicObjectCore (Statically Linked Library)
        Utilities (Statically Linked Library)
    Presentation (App)
    Services (SubDirs)
        GoogleServices (Statically Linked Library)

I'm use "Add Library" Context Menu and this is generated code in my Presentation.pro

# Link to Framework.DynamicObjectCore
win32:CONFIG(release, debug|release): LIBS += -L$$OUT_PWD/../Framework/DynamicObjectCore/release/ -lDynamicObjectCore
else:win32:CONFIG(debug, debug|release): LIBS += -L$$OUT_PWD/../Framework/DynamicObjectCore/debug/ -lDynamicObjectCore
else:unix: LIBS += -L$$OUT_PWD/../Framework/DynamicObjectCore/ -lDynamicObjectCore

INCLUDEPATH += $$PWD/../Framework/DynamicObjectCore
DEPENDPATH += $$PWD/../Framework/DynamicObjectCore

win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../Framework/DynamicObjectCore/release/libDynamicObjectCore.a
else:win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../Framework/DynamicObjectCore/debug/libDynamicObjectCore.a
else:win32:!win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../Framework/DynamicObjectCore/release/DynamicObjectCore.lib
else:win32:!win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../Framework/DynamicObjectCore/debug/DynamicObjectCore.lib
else:unix: PRE_TARGETDEPS += $$OUT_PWD/../Framework/DynamicObjectCore/libDynamicObjectCore.a

# Link to Framework.Utilities
# Link to Services.GoogleAdWordsService
# Same as above

in main.cpp I'm already include need class like this

// Include from Framework.DynamicObjectCore
#include "dynamicobject.h"
#include "MetadataModel/formmetadata.h"
// Include from Framework.Utilities
#include "metadatahelper.h"

int main(int argc, char *argv[])
{
    ...
    //Load Form Metadata
    QString filePath = QCoreApplication::applicationDirPath()+"/Config/FormMetadata/FormMetadata.xml";
    FormMetaData formMetadata = MetadataHelper::GetFormMetaData(filePath);

    DynamicObject* dynamicObject = new DynamicObject();
    QVariant val = dynamicObject->property("Name");
}

MetadataHelper::GetFormMetaData is static function

Why I get this ?
error: undefined reference to `MetadataHelper::GetFormMetaData(QString)'

Dong

After few days searching on Google.
I found the answer.

The problem is the order you Link to Static Library.

Dependency of my Projects is:
Presentation << Utilities << DynamicObjectCore

in Presentation.pro, I'm link to Static Link Library in this order

# Link to DynamicObjectCore
...
# Link to Utilities
...

I thought that it will compile DynamicObjectCore first, then compile Utilities.
But it wan't, and cause the compile error. "undefined reference to..."

When i change the Link Order

# Link to Utilities
...
# Link to DynamicObjectCore
...

And it work.