Debugger doesn't hit breakpoints

Daniele_B

I've read tons of threads with this title to solve my problem but no one worked.

My problem is easy: everytime i create a Non-QT project (only with Non-QT) debugger doesn't hit breakpoints.
I tried to see if my project was in release mode but it wasn't.
I tried to see if g++ added -g option.
I tried to erase "user.pro" file, clean all and rebuild it.
I Thought was gdb, so tried to do manual debugging, but manual debugging doesn't have any problem with breakpoints...

What else should i do in order to check if there is something wrong?

I'm currently using QT Creator 4.0.2 (QT 5.7.0) with Debian (Linux).

[Moved to Tools ~kshegunov]

koahnig

@Daniele_B

Hi and welcome to devnet forum

Typically this happens when the source is not compiled for debugging or the linker removes debug information.

First you should check with "top", if the debugger is started when you hit run.
Also you should find the proper compile and linkage flags in the "Compile output" pane of creator.

Easiest do all this it is probably easiest to start out with a fresh non-Qt application through the new project template. Just generate a "hello world" program for this test.

Daniele_B

@koahnig
Hi!
Thank you for your answer.

I made a new non-qt project, but nothing changed. This is the compile output (project name is "Secondaprova"):

23:20:23: Running steps for project Secondaprova...
23:20:23: Configuration unchanged, skipping qmake step.
23:20:23: Starting: "/usr/bin/make" 
g++ -c -pipe -g -std=gnu++11 -Wall -W -fPIC -DQT_QML_DEBUG -I../Secondaprova -I. -I/opt/Qt5.7.0/5.7/gcc_64/mkspecs/linux-g++ -o main.o ../Secondaprova/main.cpp
g++  -o Secondaprova main.o    
23:20:23: The process "/usr/bin/make" exited normally.
23:20:23: Elapsed time: 00:00.

I tried also to see if gdb started with "top" shell command, i can confirm gdb starts when i hit debug button.

kshegunov

Check this one: https://forum.qt.io/topic/74646/qt-creator-fails-to-map-breakpoints-sometimes
And if it doesn't solve it for you, post the debugger log here so we can see what's going on.

Daniele_B

This is what Debug Log shows:

1show version
2show debug-file-directory
3set print object on
4set breakpoint pending on
5set print elements 10000
6handle SIGSEGV nopass stop print
7set unwindonsignal on
8set width 0
9set height 0
10set substitute-path /var/tmp/qt-src /opt/Qt5.7.0/5.7/gcc_64
11-interpreter-exec console "set auto-solib-add on"
12python sys.path.insert(1, '/opt/Qt5.7.0/Tools/QtCreator/share/qtcreator/debugger/')
13python sys.path.append('/usr/bin/data-directory/python')
14python from gdbbridge import *
15python theDumper.loadDumpers({"token":15})
16-interpreter-exec console "set target-async off"
17-break-insert  -f "\"main.cpp\":7"
18attach 1618
19-exec-continue
20-exec-continue
21-exec-continue
22python theDumper.exitGdb({"token":22})
23show version
24show debug-file-directory
25set print object on
26set breakpoint pending on
27set print elements 10000
28handle SIGSEGV nopass stop print
29set unwindonsignal on
30set width 0
31set height 0
32set substitute-path /var/tmp/qt-src /opt/Qt5.7.0/5.7/gcc_64
33-interpreter-exec console "set auto-solib-add on"
34python sys.path.insert(1, '/opt/Qt5.7.0/Tools/QtCreator/share/qtcreator/debugger/')
35python sys.path.append('/usr/bin/data-directory/python')
36python from gdbbridge import *
37python theDumper.loadDumpers({"token":37})
38-interpreter-exec console "set target-async off"
39-break-insert  -f "\"main.cpp\":8"
40attach 1743
41-exec-continue
42-exec-continue
43-exec-continue
44python theDumper.exitGdb({"token":44})
45show version
46show debug-file-directory
47set print object on
48set breakpoint pending on
49set print elements 10000
50handle SIGSEGV nopass stop print
51set unwindonsignal on
52set width 0
53set height 0
54set substitute-path /var/tmp/qt-src /opt/Qt5.7.0/5.7/gcc_64
55-interpreter-exec console "set auto-solib-add on"
56python sys.path.insert(1, '/opt/Qt5.7.0/Tools/QtCreator/share/qtcreator/debugger/')
57python sys.path.append('/usr/bin/data-directory/python')
58python from gdbbridge import *
59python theDumper.loadDumpers({"token":59})
60-interpreter-exec console "set target-async off"
61-break-insert  -f "\"main.cpp\":8"
62-break-insert  -f "\"main.cpp\":7"
63attach 1836
64-exec-continue
65-exec-continue
66-exec-continue
67python theDumper.exitGdb({"token":67})
68show version
69show debug-file-directory
70set print object on
71set breakpoint pending on
72set print elements 10000
73handle SIGSEGV nopass stop print
74set unwindonsignal on
75set width 0
76set height 0
77set substitute-path /var/tmp/qt-src /opt/Qt5.7.0/5.7/gcc_64
78-interpreter-exec console "set auto-solib-add on"
79python sys.path.insert(1, '/opt/Qt5.7.0/Tools/QtCreator/share/qtcreator/debugger/')
80python sys.path.append('/usr/bin/data-directory/python')
81python from gdbbridge import *
82python theDumper.loadDumpers({"token":82})
83-interpreter-exec console "set target-async off"
84-break-insert  -f "\"main.cpp\":8"
85-break-insert  -f "\"main.cpp\":7"
86attach 2003
87-exec-continue
88-exec-continue
89-exec-continue
90python theDumper.exitGdb({"token":90})

kshegunov

This

50 handle SIGSEGV nopass stop print

shouldn't be there I believe. What code are you testing with? An empty project? Do you have global variables that could be segfaulting before you enter main?

Daniele_B

@kshegunov I'm testing a standard "hello world" program, but gdb doesn't hit breakpoints with any code...

kshegunov

I don't know, nothing else comes to mind. Just for completeness if someone else has other ideas would you post your g++ and gdb version and your test program (I assume 3-4 lines long). Also could you test with a newer creator (e.g. 4.3.x or 4.4.x)?

Daniele_B

gcc:

gcc version 6.4.0 20170820 (Debian 6.4.0-4)

gdb:

GNU gdb 7.11.1

Program code:

#include <iostream>

using namespace std;

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