I have written a simple C++ program like this:
#include <iostream>
using namespace std;
int main()
{
cout << "Hello.";
return 0;
}
Now I want to debug it. So what will be the command for it so my control goes to every line?
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This tutorial says How to debug in 6 simple steps thegeekstuff.com/2010/03/debug-c-program-using-gdbeluish192– eluish1922013-01-10 20:44:09 +00:00Commented Jan 10, 2013 at 20:44
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4You don't have to, your program has no bugs.Headcrab– Headcrab2016-07-19 03:17:30 +00:00Commented Jul 19, 2016 at 3:17
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4I know it's a joke, but I dislike how the focus of debuggers is on removing bugs. Debuggers allow us to understand programs in ways that would be impossible by just inspecting code.TZubiri– TZubiri2019-06-16 05:36:34 +00:00Commented Jun 16, 2019 at 5:36
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5 Answers
You can use gdb for this:
$ gdb hello
This will start gdb and prompt you for what to do next. The next command executes one line of source and stops at the next line.
I found a basic GDB tutorial that may be helpful.
Comments
Don't forget to compile your source code using -g option.
Like this: g++ -g helloWorld.cc
This is going to create an a.out executable file.
You'll be able to debug your a.out exe using gdb ./a.out command.
Another tool you may use it's ddd basically a GUI for gdb.
Good luck
Comments
I always thought emacs provided a pretty user-friendly front-end to gdb...
E.g.
- % g++ hello.cc -g -o hello
- emacs hello.cc
- [ In Emacs ] Escape-x gdb
- Emacs will say "Run gdb (like this): gdb ".
- Add your binary name ("hello"). (E.g. "Run gdb (like this): gdb hello".)
- Go to your hello.cc buffer.
- Use the emacs command 'gud-break' to set a breakpoint in gdb from your hello.cc buffer. (Normally bound to "C-x space".)
- Go to your *gud-hello* buffer.
- Type "run" at the (gdb) prompt.
- Use [ N ] Next or [ S ] Step. Or [ C ] Continue. [ BT ] Backtrace is also useful.
- Note what happens to the little triangle in the leftmost column of your hello.cc buffer.
(That should suffice to get you started. Emacs being emacs, there are always more features...)
1 Comment
Basile Starynkevitch
I recommend compiling with
g++ -Wall -Wextra hello.cc -g -o hello because compiler warnings are really helpful.If you want some user-friendly debugger, you can use Kdbg, which is basically a gdb frontend for KDE. Perhaps not so powerful as ddd, but easier to start with.
Comments
In the C++ Programming course I did in Sweden there was a part of the laboratory about the GNU Debugger. I never used it after, but here there is a paper explaining the basic usage, as far as I remember is in chapter 2.
