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Old 08-08-2017, 03:07 PM   #1
Fractal Cat
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Registered: Jul 2017
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Question Undefined references


I'm attempting to compile some code but keep coming up with same error messages:

main.cpp:29: error: undefined reference to `ki18n(char const*)'
main.cpp:33: error: undefined reference to `KLocalizedString::~KLocalizedString()'

Now, I think this is caused by not linking in the right library. But I'm
unsure of which libraries I need to link.
Any ideas ?

I'm running Linux Mint 18 and I'm using the QTCreator IDE.


Old 08-08-2017, 04:05 PM   #2
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Use the link to the api ( that Habitual provided in your previous post.
Click on "The KDE Frameworks"
Click on "KI18n".
On the left under "Use with QMake" you see "QT += KI18n"

Have you put that in your .pro file?

Last edited by norobro; 08-08-2017 at 04:25 PM. Reason: left out a step
Old 08-08-2017, 05:02 PM   #3
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Please place your code snippets (and compiler messages) inside [CODE]...[/CODE] tags for better readability. You may type those yourself or click the "#" button in the edit controls.

In addition to learning your way around the API, it is often helpful to search for the essential part of the error itself as a first step in troubleshooting messages that you are not yet familiar with. In this case a quick DDG for "undefined reference to ki18n" turns up several pages specific to this question, including this one, Getting Started/Build/Troubleshooting.
Old 08-08-2017, 05:57 PM   #4
Fractal Cat
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Undefined references


I still have problems:

Here is my .pro file

QT -= gui
QT += KI18n

CONFIG += c++11

CONFIG += console
CONFIG -= app_bundle


SOURCES += main.cpp

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0

INCLUDEPATH += /usr/include
INCLUDEPATH += /usr/include/qt4
INCLUDEPATH += /usr/include/KDE
# INCLUDEPATH += /usr/share/locale/uk/LC_MESSAGES

And in the General Message window:

Project ERROR: Unknown module(s) in QT: KI18n
Old 08-09-2017, 02:18 AM   #5
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Might a ki18n pkg be needed? Here's a simpler explanation of CODE tags.


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