Solved How to disable qDebug ?

[AnneRanch]

I am looking for suggestions on how / where to disable ALL qDebug outputs to "Application Output" view during "Run" .

I found this in another forum - but changing the QT_LOGGING_RULES does not compile when placed in header file. ( sorry the new error message posted BEFORE build does not copy something about C++ requires type specifier )

I did try to add same into main x.pro file in my "subdirs" project , it complied but did not stop qDebug from executing.

#ifndef PROJECT_COMMON_INCLUDE_H
#define PROJECT_COMMON_INCLUDE_H
#include <QLoggingCategory>
QT_LOGGING_RULES="*.debug=false"; thows C++ syntax error
#endif // PROJECT_COMMON_INCLUDE_H

[J.Hilk]

@AnneRanch
in your pro file add DEFINES += QT_NO_DEBUG_OUTPUT

disables qDebug() output

[Christian Ehrlicher]

@AnneRanch said in How to disable qDebug ?:

QT_LOGGING_RULES="*.debug=false"; thows C++ syntax error

How do you expect that this does compile at all?

QT_LOGGING_RULES is an environment variable.

[J.Hilk]

@AnneRanch
in your pro file add DEFINES += QT_NO_DEBUG_OUTPUT

disables qDebug() output

[AnneRanch]

@J-Hilk Thanks Purfect , KISS and works .Just in case anybody is interested I found this after your post.
https://forum.qt.io/topic/73314/why-does-this-defined-qt_no_debug_output-not-supress-the-qdebug

[SGaist]

Hi,

Note that Qt categorized logging is a different beast that uses qCDebug and friends. They are the one you can use QT_LOGGING_RULES with.

[AnneRanch]

@SGaist said in How to disable qDebug ?:

Hi,

Note that Qt categorized logging is a different beast that uses qCDebug and friends. They are the one you can use QT_LOGGING_RULES with.

The article I read first did not make it clear if it works with module / class or make.

I am also looking at implementing
qSetMessagePattern(testPattern); // const QString &pattern)

which is ever harder to figure out .

And it also kills qDebug....

[SGaist]

From the QLoggingCategory documentation:

Logging rules can also be specified in a QT_LOGGING_RULES environment variable; multiple rules can also be separated by semicolons:

It's an environment variable.