[[PageOutline(1-10,Contents,inline)]]

= FAQ ^([#fnfaq 1])^ -- common compilation errors =

== CMake ==

=== [Windows] [Qt5] Qt5 needs OpenGL ===

==== Error message ====
{{{
CMake Error at C:/Qt/Qt5.1.0/5.1.0/msvc2010_opengl/lib/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:16 (message):
  Failed to find "glu32" in "".
Call Stack (most recent call first):
  C:/Qt/Qt5.1.0/5.1.0/msvc2010_opengl/lib/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:50 (_qt5gui_find_extra_libs)
  C:/Qt/Qt5.1.0/5.1.0/msvc2010_opengl/lib/cmake/Qt5Gui/Qt5GuiConfig.cmake:127 (include)
  C:/Qt/Qt5.1.0/5.1.0/msvc2010_opengl/lib/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake:83 (find_package)
  cmake/PacpusDependencies.cmake:35 (find_package)
  CMakeLists.txt:51 (include)
}}}

==== Solution ====

As described [https://qt-project.org/forums/viewthread/29014 here], you should tell CMake the path to Windows SDK libraries.
[http://support.microsoft.com/kb/310519 Add environment variable] ```WINSDK_LIB``` and set it to the path containing ```GlU32.Lib```, e.g.:
{{{
c:\Program Files (x86)\Windows Kits\8.0\Lib\win8\um\x86
}}}

If you do not have Windows SDK installed, look at its [http://www.microsoft.com/en-us/download/details.aspx?id=3138 download page].

== MSVC ==

=== ```ComponentBase``` should be inherited AFTER ```QObject``` ===
==== Error message ====
{{{
>moc_Component.cpp(63): error C2039: 'staticMetaObject' : is not a member of 'pacpus::ComponentBase'
>          ComponentBase.h(60) : see declaration of 'pacpus::ComponentBase'
>moc_Component.cpp(80): error C2039: 'qt_metacast' : is not a member of 'pacpus::ComponentBase'
>          ComponentBase.h(60) : see declaration of 'pacpus::ComponentBase'
>moc_Component.cpp(85): error C2039: 'qt_metacall' : is not a member of 'pacpus::ComponentBase'
>          ComponentBase.h(60) : see declaration of 'pacpus::ComponentBase'
}}}

==== Solution ====

Your class declaration should look like:
{{{
class Component
    : QObject
    , ComponentBase
{
};
}}}

=== Class inheriting from ```QObject``` should be ```moc```-ed ===
==== Error message ====

{{{
>Component.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const pacpus::Component::staticMetaObject" (?staticMetaObject@Component@pacpus@@2UQMetaObject@@B)
>Component.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __thiscall pacpus::Component::metaObject(void)const " (?metaObject@Component@pacpus@@UBEPBUQMetaObject@@XZ)
>Component.obj : error LNK2001: unresolved external symbol "public: virtual void * __thiscall pacpus::Component::qt_metacast(char const *)" (?qt_metacast@Component@pacpus@@UAEPAXPBD@Z)
>Component.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall pacpus::Component::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@Component@pacpus@@UAEHW4Call@QMetaObject@@HPAPAX@Z)
}}}

==== Solution ====

* Check that you use ```moc``` tool on your class, i.e. file ```moc_Component.cpp``` is created and linked to the target.
1. Add ```Component.h``` to CMake variable ```MOC_FILES```.
2. Add ```${MOC_FILES}``` to the list of sources used by ```pacpus_add_library``` or ```pacpus_add_executable```.

=== Class should use ```pacpus_plugin``` ===
==== Error message ====
Similar to the previous one, but concerning ```ComponentPlugin```.

==== Solution ====
* Check that you use ```pacpus_plugin``` CMake macro and that generated files ```${PLUGIN_CPP}``` and ```${PLUGIN_HDR}``` are compiled and correspoding objects linked to the target.

=== ```addInputs()``` / ```addOutputs``` can be used only in a class derived from ```QObject``` ===
==== Error message ====
{{{
>C:\Program Files (x86)\Pacpus\include\Pacpus/kernel/InputOutputInterface.h(21): error C2664: 'pacpus::InputInterfaceBase::InputInterfaceBase(QString,pacpus::ComponentBase *,QObject *)' : cannot convert parameter 3 from 'pacpus::LMOComponent *' to 'QObject *'
>          Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
>          C:\Program Files (x86)\Pacpus\include\Pacpus/kernel/InputOutputInterface.h(18) : while compiling class template member function 'pacpus::InputInterface<T,C>::InputInterface(QString,C *,void (__thiscall pacpus::Component::* )(const T &))'
>          with
>          [
>              T=pacpus::___,
>              C=pacpus::Component
>          ]
>          C:\Program Files (x86)\Pacpus\include\Pacpus/kernel/ComponentBase.h(150) : see reference to class template instantiation 'pacpus::InputInterface<T,C>' being compiled
>          with
>          [
>              T=pacpus::___,
>              C=pacpus::Component
>          ]
>          ..\..\..\cityvip-2.0-beta1\src\LMOComponent\Component.cpp(44) : see reference to function template instantiation 'void pacpus::ComponentBase::addInput<pacpus::___,pacpus::Component,void(__thiscall pacpus::Component::* )(const pacpus::___ &)>(const char *,Function)' being compiled
>          with
>          [
>              Function=void (__thiscall pacpus::Component::* )(const pacpus::___ &)
>          ]
}}}

==== Solution ====

Inherit your class from ```QObject```.

== Varia ==

[=#fnfaq] FAQ -- Frequently Asked Questions