.
FYI, in the links after the conclusion, the back link does not point to the previous lesson. It points to the current lesson.
thanks!
Thanks, fixed.
What I've come to find out is that you have to start a project otherwise some features won't be available on CodeBlocks. I don't know why this is... The debugger didn't work until i rewrote my file, and included it in a project.
I found a solution to stop the debugger from stepping into the code for operator<<. Here's the solution:
It requires editing the default.natstepfilter file.
This applies to Visual Studio 2012 and up. Older versions require changing values in the registry (Google how-to for older versions -- though you should REALLY upgrade!).
Locate the default.natstepfilter file:
Above filepaths are for Visual Studio 2015. It should be easy to locate your own version. Here are the version numbers for the different versions of Visual Studio:
When you find the file, open the file with an editor (I used Notepad++).
You may need to run as adminstrator!
Add this line to the file (along with the other lines already listed):
Note: Above line does not only apply for operator<< though. It applies to the whole std:: library, and since the above operator is a part of the standard library, it'll obviously apply for that as well. The dot and the asterisk in std::.* indicates that.
So the next time you run the debugger, it won't step into operator<< (or anything else in the std:: library for that matter) as seen by the "NoStepInto" value. It basically tells the debugger to step over the matched function (in this case, the operator<<).
You can specify any function to step over by listing them as non-user code in the default.natstepfilter file.
I hope it helps!
the integrated debugger in codeblocks is terrible
and btw, isn't "step out" basically the same as "run"? or are they different? I'd try them both out to see if there's any difference, but as I said, codeblocks debugger is broken
Step out runs the current function and returns control back to you once the function exits. Run runs until the end of the program.
If you are inside of main(), they are essentially identical, but from within a subfunction, they exhibit different behaviors.
gandu sala
I actually had to download another compiler/debugger combo, the previous was probably bad/bugged. But this Works now ^^
Hey Alex, i love your guide but i am a total noob and ran into a problem. When i press "step into" in codeblocks, at the bottom of the screen at the debugger option it just writes failed. Why and how could i fix it?
p.s. "failed" is the response for everyoption, like continue and run to cursor.
I've never heard of this happening before. My advice would be to use google to see if you can find anyone else having the same issue. Maybe they'll know what the fix is.
One thing to check though: are you using a debug build configuration?
This sounds like a stupid question, but I do not understand what this means: return control
"step into enters the function and returns control at the top of the function"
"at this point, printValue() has finished executing and control is returned to main()"
"returns control to you"
I thought I might see it somewhere in the Output window of Visual Studio 2015. But the output window tells me "'Turtorial_01.exe' (Win32): Loaded 'C:\Windows\SysWOW64\bcryptprimitives.dll'. Cannot find or open the PDB file.".
All I see is a "diagnostics tool" window that tells me "Step Recorded" and the time it took.
by "returns control", I mean the program pauses and you have the ability to choose what to do next.
your tutorial is good. I am using code block.When i am running that particular program given ,it's printing '5' in console window but when I am checking with step commands,it's not showing '5' in console window ,it is showing "warning GDB:Failed to set controlling terminal:operation not permitted"
include <iostream>
using namespace std;
void print(int);
int main()
{
cout<<"hello world"<<endl;
print(5);
return 0;
}
//linked up with other file
#include<iostream>
void print(int val)
{
std:: cout<<val;
}
Could be an OS or code::blocks configuration problem. See if any of the suggestions made here help.
When I Step into (Code::Blocks) the console windows opens with the following message:
warning: GDB: Failed to set controlling terminal: Operation not permitted
And If I 'step into' until the end of the program I never see any output to the terminal.
Debugger:
Building to ensure sources are up-to-date
Selecting target:
Debug
Adding source dir: /home/m/CBprojects/debuuging/
Adding source dir: /home/m/CBprojects/debuuging/
Adding file: /home/m/CBprojects/debuuging/bin/Debug/debuuging
Changing directory to: /home/m/CBprojects/debuuging/.
Set variable: LD_LIBRARY_PATH=.:
Starting debugger: /usr/bin/gdb -nx -fullname -quiet -args /home/m/CBprojects/debuuging/bin/Debug/debuuging
done
Registered new type: wxString
Registered new type: STL String
Registered new type: STL Vector
Setting breakpoints
Debugger name and version: GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
At /home/m/CBprojects/debuuging/main.cpp:10
At /home/m/CBprojects/debuuging/main.cpp:5
At /home/m/CBprojects/debuuging/main.cpp:6
At /home/m/CBprojects/debuuging/main.cpp:11
At /home/m/CBprojects/debuuging/main.cpp:12
Cannot open file: libc-start.c //Error in red highlight.
At libc-start.c:321
Not sure, this sounds like an operating system permissions issue. Perhaps read through this thread and see if it's helpful.
Getting strange error I can't fix, runs debugger up until return line then gets the following error:
Cannot open file: ../../../../src/gcc-4.7.1/libgcc/unwind-sjlj.c
PS)
I'm using Code::Blocks and the problem is occurring when I press step into;
The project works later however if I comment out a cin statement... please help, I'm so lost right now;
Update: After some experimenting it seems the debugger doesn't work with ANY file if I'm including a header file...
That would really surprise me, since #including a header file just copies the contents into the including file.
I'm not sure what the issue is here, sounds like a bug in the GDB debugger itself.
This is probably a better question for Google than these forums. Maybe another user has found a solution.
I've been looking everywhere, including asking on a few sites but haven't gotten anything back... (I'll keep waiting though) It sounds like its a problem with the debugger's settings. I've noticed on the stack window after I get to the point where it doesn't work a new function shows up in red: "_Unwind_SjLj_Unregister (fc=0x69fe7c)"
Thank you so much for your speedy response, I appreciate it! :)
If run gdb by itself in command prompt, I get:
gdb: error while loading shared libraries: libncursesw.so.6: cannot open shared object file: No such file or directory
Getting the same behaviour on Geany with Debug plugin loaded:
See Error dialog with message:
"GDB died unexpectedly with status 32512"
Seems there is some problem with GDB.
Have gdb 7.10.1-1, geany 1.26-2, geany-plugin 1-26-1 installed
Downgraded gdb to 7.9.1
Debugger works with Code::Blocks
Have installed gdb and Code:Blocks on Linux Manjaro.
After setting breakpoints in the code and stepping into the program, I get the following output without having the program stop at the required breakpoint:
Selecting target:
Debug
Adding source dir: /home/guest/Documents/Develop/Cpp/Projects/Ch01/1-11wv/
Adding source dir: /home/guest/Documents/Develop/Cpp/Projects/Ch01/1-11wv/
Adding file: /home/guest/Documents/Develop/Cpp/Projects/Ch01/1-11wv/bin/Debug/1-11wv
Changing directory to: /home/guest/Documents/Develop/Cpp/Projects/Ch01/1-11wv/.
Set variable: LD_LIBRARY_PATH=.:
Starting debugger: /usr/bin/gdb -nx -fullname -quiet -args /home/guest/Documents/Develop/Cpp/Projects/Ch01/1-11wv/bin/Debug/1-11wv
done
Debugger finished with status 1
I've switched to gnome terminal. under SETTINGS -> Environment -> Terminal to launch:
gnome-terminal --disable-factory --hide-menubar -t $TITLE -x
I still get the error, but at least now the value 5 appears on the terminal; anyway I don't think the debugger is working properly because I get the value 5 only at the end instead it should be before.
I get the following error when trying to degub
warning: GDB: Failed to set controlling terminal: Operazione non permessa
someone can help?
Hey Alex, in this section, function printValue() is written PrintValue() in some places. Fix that. Great Tutorials :)
Thanks for the tip. Fixed!
#include "stdafx.h"
#include <iostream>
using namespace std;
void thank_you()
{cout<<"i just wanna thank this adorable site "<<endl;
}
int main (){
thank_you();
cout<<"guys this is the best page i ever seen to learn people like me \n who love learning programming \n but they <<"dont know how to start "<< endl<<endl;
cout<<"bless you guys"<<endl;
return 0;
Would it be possible for you to add a basic "how to debug using gdb" in this section for those of us running from the command window?
I actually don't know how to debug using GDB since I don't use it. Fortunately there are other tutorials on the internet explaining how to debug using GDB. You might try one, such as.
Thank you Alex!
Hey Thanks for this amazing blog But i got a question about debugging
Does debugging help me In anyway if i was using a command line (since i dont think most of the features would be there in a command line)? Oh and if so can you recommend me one? (I only got 128mb of ram, Im saving up for new one don't worry xD)
Yes, you can debug console application via the command line. It's not as easy as via an IDE, but it can be done. Check out the GDB debugger.
First, Thank you Alex for this fantastic C++ tutorials. I'm a newbie to coding and thoroughly enjoying your materials. The way you explain things are quite succinct, clear and to the point. I truly admire your writing style.
Anyway, in case someone is having an issue getting the debugger working in Code::Blocks (e.g. debugging not executing or console windows console suddenly closing), it may be due to your anti-virus software. If it is, my suggestion is to exclude your Code::Blocks install directory from being scanned by your anti-virus. This is how I resolved my debugger issue which eventually stopped me from banging my head on the computer desk.
Hi, thanks for the tutorials. Having done plenty of tutorials like this, for various scripting languages and packages, I like they way you have started with a few juicy commands like cout and cin and functions, and then went on to the more prosaic stuff of how the compiler works, like #include and #define and debugging, before going back to flow control, loops and covering the rest of the standard commands. Usually most ppl who prepare tutorials would cover printing to the screen "hello world", variables, functions, flow control, loops, then go on to the stuff about how the compiler works and compile time directives and program structure, but as that stuff isn't as exciting as learning new commands, some people mightn't keep with it long enough to get to them. The way you have structured the tutorial makes me want to plough through that....OK I'll say it boring stuff, to get back to the good stuff, don't know if that was intentional but it's working for me.
I'm STILL laughing at "Hello, word!"
Hi, these tutorials are great.
I'd just like to point out in section "Run to cursor" there is a small inconsistency with the variable name: "value" is referred to as "nValue".
Cheers
Thanks for noticing. It's fixed now.
Thanks.
Hi Alex and thx for the great tutorials.I have a question: I am a little confused with step out.
when i use the step out in the std::cout << value; //command in the Print Value Function(),
It executes the command! I thought it shouldn't.... :(
Step out executes all the commands in the function, and then returns control to you when the function has returned to the caller. I see that the lesson text is unclear in this regard, so I'll update it.
i am using Xcode for mac and when i open the debug dropdown menu the step into line is there but not available to select. is there a certain line i must have highlighted or would there be any other problem? thanks :)
I can't answer this since I don't have XCode. Perhaps another reader can help?
Make sure you're compiling your program in debug mode and not release mode.
You have to enable breakpoints, clicking the line number at the left of (...) each line.
A global breakpoint disabler is available at the top of the debugger window.
I enabled breakpoints and I hit run. It unlocked the debugger "step into" and all that but it gives you a weird window that I can't even understand. Anybody know what this stuff means:
Debug`main:
0x100000f50 <+0>: pushq %rbp
0x100000f51 <+1>: movq %rsp, %rbp
0x100000f54 <+4>: subq $0x10, %rsp
0x100000f58 <+8>: movl $0x5, %edi
0x100000f5d <+13>: movl $0x0, -0x4(%rbp)
-> 0x100000f64 <+20>: callq 0x100000f20 ; printValue(int) at main.cpp:4
0x100000f69 <+25>: xorl %eax, %eax
0x100000f6b <+27>: addq $0x10, %rsp
0x100000f6f <+31>: popq %rbp
0x100000f70 <+32>: retq
Looks like assembly code.
This is what I might expect to see if you tried to debug a release build instead of a debug build.
I think you might be right. I went to "debug">"debug workflow">and there was this thing called "always show disassembly". I unchecked it and I was able to debug everything fine. Not sure if this is related to the build or not but if it is good call.
Here's a youtube video that explains Xcode 7 debugging:
i'm using codeblocks 13.12 and i cannot find the "step over" option in the debug menu. do you know where i can find it? thanks
Try "Next Line" or "Next Instruction".
It was a very helpful post Alex, Thanks :)
Using visual effects 2010 if I go to do the step into command for [std:: << cout value;] the debugger opens a read only code called ostream. If I keep trying the step into command more read only code comes up. Is there a way to change this in settings and I just can't find it or do I need to get another debugger program. Using the step out command it also opens another read only code file called crtexe.c
This is actually expected. If you "step into" std::cout << value, it'll take you into the code for operator<<.
Use "step over" instead, or if you accidentally "step into" this code, use "step out" to get back out to your code.
Ok, thanks. ]
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