Using libraries in libraries

zicx

Is it possible to use libraries in libraries?

I added some libraries, both shared and static and got them to work so that I can use them in a desktop application. However, when I try to use a static library in another static library or a shared library in another shared library that does not seem to work.
I get the error

C:\CPP\Test\SharedLib\sharedlib.cpp:4: error: C1083: Cannot open include file: 'sharedlib_2.h': No such file or directory

Is there a way around it? If not, what is the best way to structure projects/libraries. It seems to be very limiting that that libraries cant use other libraries

This is my application's .pro where I can use he library

QT += core
QT -= gui

CONFIG += c++11

TARGET = Test
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../SharedLib/release/ -lSharedLib
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../SharedLib/debug/ -lSharedLib

INCLUDEPATH += $$PWD/../SharedLib
DEPENDPATH += $$PWD/../SharedLib

win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../SharedLib_2/release/ -lSharedLib_2
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../SharedLib_2/debug/ -lSharedLib_2

INCLUDEPATH += $$PWD/../SharedLib_2
DEPENDPATH += $$PWD/../SharedLib_2

and the .pro of SharedLib which is supposed to use SharedLib_2

QT       -= gui

TARGET = SharedLib
TEMPLATE = lib

DEFINES += SHAREDLIB_LIBRARY

SOURCES += sharedlib.cpp

HEADERS += sharedlib.h\
        sharedlib_global.h

unix {
    target.path = /usr/lib
    INSTALLS += target
}

win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../SharedLib_2/release/ -lSharedLib_2
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../SharedLib_2/debug/ -lSharedLib_2

INCLUDEPATH += $$PWD/../SharedLib_2
DEPENDPATH += $$PWD/../SharedLib_2

I added them both via the automatic add library and the lines are identically... so I would have expected this to work

includes are

application

#include <QCoreApplication>

#include "sharedlib.h"
#include "sharedlib_2.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    SharedLib sl;
    SharedLib_2 sl_2;

    return a.exec();
}

sharedLib

#include "sharedlib.h"

#include "sharedlib_2.h"  // ERROR HERE

SharedLib::SharedLib()
{
}

SGaist

Hi,

Not that I want to be picky but you write that you get error Cannot open include file mylibrary.h: no such file or directory but in what you provide there's not mylibrary.h that can be seen.

zicx

@SGaist
Thanks for pointing out. Edit and copied the actual error

zicx

As a first simple question.... Is it possible to use libraries in libraries or does that generally not work?

If it is possible... second question: why does it not work here?

SGaist

Sure it's possible, otherwise how you could any library that has dependencies work ?

Did you re-run qmake after modifying your libs .pro file ?

One thing that is not clear, how are these projects related ? One common with sub-projects or each his own ?

zicx

@SGaist

I did rerun qmake

Both libraries are separate projects ( I think.. ). When creating them the drop down "Add as subproject to project: is greyed out, I cant chose anything there

SGaist

Where are they located on your filesystem ?
Where exactly did you build them ?

zicx

@zicx

I misunderstood qmake. thought it runs on all projects. rerunning it on all individual projects fixed it

zicx

@SGaist

Thanks a lot for your help