"Undefined reference to"

Chanchan

Hi !!
I got a problem on one of my code :)
I use this line :

m_module.insert(std::pair<QString, AbstractGUIModule*>("Source Video", new VideoModule(DLTCommSetup::DEFAULT_DLT_ADDRESS_GND, QString().number(DLTCommSetup::DEFAULT_RTSP_PORT), DLTCommSetup::DEFAULT_RTSP_MEDIA, VERBOSE8MODULES, parent())));

I got the error : "Undefined reference to 'DLTCommSetup::DEFAULT_DLT_ADDRESS_GND' "

in my header DLTCommSetup :

static constexpr char DEFAULT_ADDRESS_GND[13]="192.168.x.xx"

So it is well defined here, if needed here is my VideoModule constructor :

VideoModule::VideoModule(QString ip, QString port, QString media, bool verbose, QObject* interface_qml) :
AbstractGUIModule("Source Video", verbose, interface_qml), m_video_state(VideoState::OFF), m_current_mode(Mode::GROUND), m_video_packet_flag(false), m_media_player("VideoPlayer")

I dont understand where the "undefined reference" comes from :/
Thanks for help :D

Chanchan

It's okey, I found my problem ! I called the wrong module where my function is, that caused (I dont know why) that error
Qt Magic !
Thx for your help :)

mrjj

Hi
Make sure you don't have cyclic includes.
That can also give undefined errors.

Chanchan

Ichecked and it is okey, any cyclic include in my project :/

SGaist

Hi,

Did you declare DEFAULT_ADDRESS_GND as part of your class or is it floating in the header file ?

Chanchan

Hey !
It is in my public part :

class DLTCommSetup {
public: 
DLTCommSetup();
....
...
static constexpr char DEFAULT_ADDRESS_GND[13]="192.168.x.xx"

JonB

@Chanchan

I got the error : "Undefined reference to 'DLTCommSetup::DEFAULT_DLT_ADDRESS_GND' "
static constexpr char DEFAULT_ADDRESS_GND[13]="192.168.x.xx"

Maybe it's just me not understanding, but how is DEFAULT_ADDRESS_GND "So it is well defined here" supposed to relate to/help/avoid the undefined reference on DLTCommSetup::DEFAULT_DLT_ADDRESS_GND ?

mrjj

@JonB
hehe, its more like you have a good eye :)
Not the same name.

Chanchan

Well that's the point ^^
I change it thank you... but still the same error (I made a copy/paste sooo we're sure it is the same name now). But the problem still here with the same error message :/ (I cleaned up the project and ran qmake before builded it again

JonB

@Chanchan
Show the relevant code and the corresponding error message as they are right now.

Chanchan

It's okey, I found my problem ! I called the wrong module where my function is, that caused (I dont know why) that error
Qt Magic !
Thx for your help :)