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Editorial Team
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Asked: 2026-06-08T07:19:36+00:00

Well, the title pretty much says it all. I start up Qt Creator, I

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Well, the title pretty much says it all. I start up Qt Creator, I create a new project and click the plain C++ option. It creates the following code in the main.cpp file:

#include <iostream>

using namespace std;

int main()
{
    cout << "Hello World!" << endl;
    return 0;
}

I put a breakpoint on the line beginning with cout or return.

I set the project mode to debug.

I click the play button with the bug on it.

It doesn’t stop at the breakpoint.

If I do the exact same thing but having created a Qt GUI Application, it works.

Help’d be much appreciated.

Thank you.

Oh yeah, if it makes any difference, I’m using the latest version of Linux Mint and from what I can tell, GCC and GDB are installed.

Edit: Here is the:

Compile Output:

23:27:37: Running build steps for project untitled2...
23:27:37: Starting: "/usr/bin/qmake-qt4" '/home/jean-luc/Desktop/untitled folder/untitled2/untitled2.pro' -r -spec linux-g++ CONFIG+=debug CONFIG+=declarative_debug
23:27:37: The process "/usr/bin/qmake-qt4" exited normally.
23:27:37: Starting: "/usr/bin/make" -w
make: Entering directory `/home/jean-luc/Desktop/untitled folder/untitled2-build-desktop-Qt_4_8_1_in_PATH__System__Debug'
g++ -c -pipe -g -Wall -W -DQT_WEBKIT -I/usr/share/qt4/mkspecs/linux-g++ -I../untitled2 -I../untitled2 -I. -o main.o ../untitled2/main.cpp
g++  -o untitled2 main.o      
{ test -n "" && DESTDIR="" || DESTDIR=.; } && test $(gdb --version | sed -e 's,[^0-9]\+\([0-9]\)\.\([0-9]\).*,\1\2,;q') -gt 72 && gdb --nx --batch --quiet -ex 'set confirm off' -ex "save gdb-index $DESTDIR" -ex quit 'untitled2' && test -f untitled2.gdb-index && objcopy --add-section '.gdb_index=untitled2.gdb-index' --set-section-flags '.gdb_index=readonly' 'untitled2' 'untitled2' && rm -f untitled2.gdb-index || true
make: Leaving directory `/home/jean-luc/Desktop/untitled folder/untitled2-build-desktop-Qt_4_8_1_in_PATH__System__Debug'
23:27:38: The process "/usr/bin/make" exited normally.

Application Output:

Debugging starts
Debugging has finished

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1 Answer

  1. Editorial Team

    Even though this is already a few days old, I’d like to add this resolution, as the problem described occasionally happens with Qt and Creator: Qt Creator has the nasty habit to suggest having the release and the debug objects in the same folder. So if you compile a release build, then decide to debug your program and make a debug build, it will link a debug application with release objects.
    These objects cannot have a breakpoint set into. You need to clean the project completely, call qmake and make all in debug mode. Then you should be able to set breakpoints properly.

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