The GDB interface does not support comments in the command

[andrei132]

Describe the bug
GDB comment commands are not supported by eclipse. Any GDB comment cannot be executed successfully and give Undefined command: "". Try "help".

To Reproduce
It can be reproduced using any view that allows giving commands to GDB. I will give DebuggerConsole as an example.

1. Create a new C project
2. Build project
3. Debug project with C/C++ Application
4. Open Debugger Console view
5. Give some GDB comment

Observed behavior
Undefined command: "". Try "help".

Expected behavior
The command must be given successfully without displaying errors

Version Information (please complete the following information):

• Windows 10/11
• Eclipse 23.12
• CDT Version from Help -> 11.04

[jonahgraham]

Hi @andrei132, The bug you reported here is a GDB issue. CDT does "the right thing" AFAICT and this is the MI sent to GDB:

711,264 35-interpreter-exec console "#some comment"
711,266 &"Undefined command: \"\".  Try \"help\".\n"
711,266 35^error,msg="Undefined command: \"\".  Try \"help\"."

Please report this bug to GDB.

PS the version of GDB in your screenshot is unfortunately ancient. While this issue exists in latest GDB, I recommend reporting the bug with a more recent screenshot.

[andrei132]

In GDB, the comments are evaluated ok

But in eclipse

I would insist on re-opening this ticket if it is posible

[jonahgraham]

Your screenshot does not show gdb doing the correct thing - it shows GDB in CLI mode, not MI mode. The bug is that -interpreter-exec console "#some comment" in GDB's MI mode generates an error instead of silently ignoring the comment. If this issue is affecting you, you will need to ask GDB to resolve it, first step is to create a bug report.

If you want CDT to resolve (workaround) the issue, you can suggest a patch. I will reopen the issue in the hope you provide such a patch. For example you can add some interpretation of commands users types to edit command before passing them to -interpreter-exec console. Have a look at org.eclipse.cdt.dsf.mi.service.breakpoint.actions.CLIDebugActionEnabler. It will be a fairly high high bar to accept a patch that does comment processing in CDT as it would mean CDT would have to understand a lot of CLI context. For example, you can't just exclude everything after # without parsing the line, or else a command like print "this is # not a comment" would break.

PS I note that your host machine is Windows - the other (and probably better) option would be to implement new-ui support on Windows. This would resolve similar problems like #362