Undefined reference on subprojects

[Exotic_Devel]

In my project I created two static libraries, 'gui' and 'dataaccess'.
'dataaccess' uses the 'gui' library ('dataaccess' include 'gui') and 'gui' makes use of a dynamic library 'DynamicQtWidgets'. There is also a unit test that tests the 'dataaccess' library.
During compilation, the libraries are compiled without errors, but the build fails during compilation of the test with the error "undefined reference" and indicates two lines of code:

@undefined reference to Configconnec::Configconnec(QObject*)' undefined reference toConfigconnec::exec()'
@

These lines are in the 'dataaccess' library code. But if the error is in the code of the library, because the library does not generate compilation errors?

If we construct libraries only, ie without the test, does not return errors. The error occurs during compilation of the test.

Below .pro files

Core.pro

@TEMPLATE = subdirs

SUBDIRS +=
gui
dataaccess
tests

CONFIG += ordered
@

dataaccess.pro

@
#-------------------------------------------------

Project created by QtCreator 2014-07-23T14:15:58

#-------------------------------------------------

QT += sql widgets

TARGET = dataaccess
TEMPLATE = lib
CONFIG += staticlib

SOURCES += dataaccess.cpp

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

win32:CONFIG(release, debug|release): LIBS += -L$$OUT_PWD/../gui/release/ -lgui
else:win32:CONFIG(debug, debug|release): LIBS += -L$$OUT_PWD/../gui/debug/ -lgui
else:unix: LIBS += -L$$OUT_PWD/../gui/ -lgui

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

win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../gui/release/libgui.a
else:win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../gui/debug/libgui.a
else:win32:!win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../gui/release/gui.lib
else:win32:!win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../gui/debug/gui.lib
else:unix: PRE_TARGETDEPS += $$OUT_PWD/../gui/libgui.a
@

gui.pro

@#-------------------------------------------------

Project created by QtCreator 2014-09-02T13:39:00

#-------------------------------------------------

QT += widgets sql

TARGET = gui
TEMPLATE = lib
CONFIG += staticlib

SOURCES +=
configconnec.cpp

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

OTHER_FILES += configconnec.ui

copyuifile.commands = $(COPY_DIR) $$PWD/configconnec.ui $$OUT_PWD
first.depends = $(first) copyuifile
export(first.depends)
export(copyuifile.commands)
QMAKE_EXTRA_TARGETS += first copyuifile

win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../../../DynamicQtWidgets/build/release/ -ldynamicqtwidgets
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../../DynamicQtWidgets/build/debug/ -ldynamicqtwidgets
else:unix: LIBS += -L$$PWD/../../../DynamicQtWidgets/build/ -ldynamicqtwidgets

INCLUDEPATH += $$PWD/../../../DynamicQtWidgets/build
DEPENDPATH += $$PWD/../../../DynamicQtWidgets/build
@

tests.pro

@QT += testlib sql widgets

HEADERS +=
testdataaccess.hpp

SOURCES +=
testdataaccess.cpp
main.cpp

win32:CONFIG(release, debug|release): LIBS += -L$$OUT_PWD/../dataaccess/release/ -ldataaccess
else:win32:CONFIG(debug, debug|release): LIBS += -L$$OUT_PWD/../dataaccess/debug/ -ldataaccess
else:unix: LIBS += -L$$OUT_PWD/../dataaccess/ -ldataaccess

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

win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../dataaccess/release/libdataaccess.a
else:win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../dataaccess/debug/libdataaccess.a
else:win32:!win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../dataaccess/release/dataaccess.lib
else:win32:!win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../dataaccess/debug/dataaccess.lib
else:unix: PRE_TARGETDEPS += $$OUT_PWD/../dataaccess/libdataaccess.a
@

[Exotic_Devel]

Resolved.

As "gui" and "dataaccess" are static libraries, you must include them in the test pro file and also include the shared "DynamicQtWidgets" library. My modified tests.pro

@QT += testlib sql widgets

HEADERS +=
testdataaccess.hpp

SOURCES +=
testdataaccess.cpp
main.cpp

#lib dataaccess
win32:CONFIG(release, debug|release): LIBS += -L$$OUT_PWD/../dataaccess/release/ -ldataaccess
else:win32:CONFIG(debug, debug|release): LIBS += -L$$OUT_PWD/../dataaccess/debug/ -ldataaccess
else:unix: LIBS += -L$$OUT_PWD/../dataaccess/ -ldataaccess

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

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

lib GUI

win32:CONFIG(release, debug|release): LIBS += -L$$OUT_PWD/../gui/release/ -lgui
else:win32:CONFIG(debug, debug|release): LIBS += -L$$OUT_PWD/../gui/debug/ -lgui
else:unix: LIBS += -L$$OUT_PWD/../gui/ -lgui

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

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

#lib DynamicQtWidgets
win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../../../DynamicQtWidgets/build/release/ -ldynamicqtwidgets
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../../DynamicQtWidgets/build/debug/ -ldynamicqtwidgets
else:unix: LIBS += -L$$PWD/../../../DynamicQtWidgets/build/ -ldynamicqtwidgets

INCLUDEPATH += $$PWD/../../../DynamicQtWidgets/build
DEPENDPATH += $$PWD/../../../DynamicQtWidgets/build
@