Undefined refence to "main"
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Well, if you are used to cmake, you can continue using it. There's no need to switch over to qmake especially since Qt 6 build system will be cmake.
You can find here the CMake manual for Qt projects.
However, if you really want to use qmake, then from the structure you are showing it seems that you would like to have:
- One application project which is
app - One library project which is
src(and that you are currently trying to build as an app)
Based on the test folder, it seems that you would like to do some unit testing (which is very good) so do you want to test your application or your library ?
- One application project which is
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Hello SGaist,
I think I need to give you more detail about the project. So I have a first computer where this project is build as if (so with the src part building as an application and not as a library) using QT creator. On this computer we just load the project by opening MainPro.pro, compute it and launch it inside QT creator.
Now on my computer I'm trying to do the same thing. The test folder is indeed a unit testing used to test so algorithms from the src part. In QT creator i get some errors so I tried first to compile outside using qmake. I'll try to solve those errors directly inside Qt creator as compiling outside of it seemed to be a bad idea. I'll let you know if I can find what s wrong.
Thanks again for your help
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Additionnally I get :
no matching function for call to ‘SolutionPoolModel::connect(SolutionPoolModel*, void (QAbstractItemModel::)(const QModelIndex&, const QModelIndex&), SolutionPoolModel::SolutionPoolModel(ParametersSet, QObject*)::<lambda(const QModelIndex&, const QModelIndex&, const QVector<int>&)>)’
connect(this, &SolutionPoolModel::dataChanged, [this](const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles){Q_UNUSED(topLeft) Q_UNUSED(bottomRight) Q_UNUSED(roles) this->updateMakespanBoundaries();}); ^ -
@R-griset said in Undefined refence to "main":
void (QAbstractItemModel::)(const QModelIndex&, const QModelIndex&),
This is Qt4 ... you mix Qt4 and Qt5 include files.
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Select the correct qmake for the correct Qt5 kit under 'Qt versions'
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Hello Christian Ehrlicher and thanks for helping
Ok i changed the kit but now i'm getting back to my initial issue which I encountered outside of Qt creator : the undefined reference to main :(
13:35:55: Running steps for project anchorage...
13:35:55: Configuration unchanged, skipping qmake step.
13:35:55: Starting: "/usr/bin/make"
cd src/ && ( test -e Makefile || /usr/lib/x86_64-linux-gnu/qt5/bin/qmake /home/d07876/Desktop/Ancrage/Code\ interface\ graphique\ ancrage/UI_11_05/src/src.pro -spec linux-g++-64 CONFIG+=debug CONFIG+=qml_debug -o Makefile ) && /usr/bin/make -f Makefile
make[1]: Entering directory '/home/d07876/Desktop/Ancrage/Code interface graphique ancrage/build-anchorage-QT5-Debug/src'
g++ -m64 -o src heuristics.o longest_paths.o manual_modification.o metaheuristics.o resource_flow_computation.o resource_flow_modifications.o data_models.o data_structures.o resource_flow.o parsing.o writing.o central_widget.o central_widget_solution_tab.o gantt_view.o mainwindow.o parameters_bar.o parameters_edition_dialog.o resource_view.o sidebar.o sidebar_list.o solution_pool_view.o moc_data_models.o moc_central_widget.o moc_central_widget_solution_tab.o moc_gantt_view.o moc_mainwindow.o moc_parameters_bar.o moc_parameters_edition_dialog.o moc_resource_view.o moc_sidebar.o moc_sidebar_list.o moc_solution_pool_view.o -L/usr/X11R6/lib64 -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread
/usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o: In function_start': (.text+0x20): undefined reference tomain'
Makefile:228: recipe for target 'src' failed
make[1]: Leaving directory '/home/d07876/Desktop/Ancrage/Code interface graphique ancrage/build-anchorage-QT5-Debug/src'
Makefile:43: recipe for target 'sub-src-make_first' failed
collect2: error: ld returned 1 exit status
make[1]: *** [src] Error 1
make: *** [sub-src-make_first] Error 2
13:35:56: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project anchorage (kit: QT5)
When executing step "Make"
13:35:56: Elapsed time: 00:01. -
In your src.pro you tell qmake that you want to build an application but you do not provide a main() function there (I would guess)
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@Christian-Ehrlicher but this exact code work perfectly on an other computer so there should be a setting which doesn't need a main function there
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@R-griset said in Undefined refence to "main":
so there should be a setting which doesn't need a main function there
Yes, don't tell qmake that you want to create an application... an application needs a main.
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When I do so i.e replacing TEMPLATE = app by TEMPLATE = lib in the src.pro file , it leads to other errors.
In an other computer it work with TEMPLATE = app without this "undefined reference to main" issue so I'm looking for an explanation about how QT creator build the project in the other computer.
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@Christian-Ehrlicher when I define src as a library I get
/usr/bin/ld: cannot find -lmyapp
Makefile:127: recipe for target 'app' failed
make[1]: Leaving directory '/home/d07876/Desktop/Ancrage/Code interface graphique ancrage/build-anchorage-QT5-Debug/app'
Makefile:68: recipe for target 'sub-app-make_first' failed
collect2: error: ld returned 1 exit status
make[1]: *** [app] Error 1
make: *** [sub-app-make_first] Error 2
15:01:17: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project anchorage (kit: QT5)
When executing step "Make" -
As already pointed out earlier, your project, as it is can not compile.
As for your LIBS statement, the library is generated in the shadow build folder, not in your sources where you are pointing it to. Use the OUT_PWD variable as starting folder.
