lldbg with WSL

[onyx22574]

I have a C/C++ test example under WSL-Ubuntu 20.04 LTS, Win10:

>:~/projects/test$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.3 LTS
Release:        20.04
Codename:       focal

>:~/projects/test$ pwd
/home/user1/projects/test

>:~/projects/test$ ls
main  main.cpp

The code of project main.cpp

#include <iostream>
  
int main() 
{

    std::cout << "Hello world" << std::endl;
  
    return 0;
}

Unfortunately, I can't debug it - this is my launch.json

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "clang++ - Build and debug active file",
            "type": "cppdbg",
            //"type": "lldb",
            "request": "launch",
            "program": "${fileDirname}/${fileBasenameNoExtension}",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${fileDirname}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "lldb",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ],
            "preLaunchTask": "C/C++: clang++ build active file",
            "miDebuggerPath": "/usr/bin/lldb-mi"
        }
    ]
}

I have installed under WSL:Ubuntu clang, lldb, CodeLLD (other plugins) under WSL:Ubuntu 20.04

>:~/projects/test$ whereis lldb-mi
lldb-mi: /usr/bin/lldb-mi /usr/share/man/man1/lldb-mi.1.gz
>:~/projects/test$ whereis clang
clang: /usr/bin/clang /usr/lib/clang /usr/include/clang /usr/share/man/man1/clang.1.gz
>:~/projects/test$ whereis clang++
clang++: /usr/bin/clang++
>:~/projects/test$ lldb --version
lldb version 10.0.0
>:~/projects/test$ clang --version
clang version 10.0.0-4ubuntu1
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

How to properly configure vscode launch.json to have C/C++ code compiling and debugging with clang/lldb?

Thank you!

Note: Per StackOverflow comment: if cpptools is installed, it will conflict with clang+CodeLLDB

[Hoernchen]

lldb does not work with classic WSL - just try manually debbung using lldb, it just gets stuck/doesn't to anything either. See microsoft/WSL#2796 and so on.

[red-lonely-neuron]

Hi.

I am also using Visual Studio Code remote connection to write code and debug it on a remote computer (either a real Linux host via the Remote SSH connection or the WSL via the WSL extension).
I have run a test: I am working on the same code that I have cloned from a git server both on a real Linux host and on WSL. Debugging worked on the Linux host but not on WSL. I have noticed something very strange. When I installed the CodeLLDB extension on the remote Linux host, it came with the Linux binaries of LLDB. On the WSL, the extension came with the Windows binaries of LLDB when it should've come with the Linux ones.

This is what ls prints in ~/.vscode-server/extensions/vadimcn.vscode-lldb-1.10.0 on the remote Linux host:

user@linux-remote:/home/user/.vscode-server/extensions/vadimcn.vscode-lldb-1.10.0 > ll lldb/
total 0
drwxr-xr-x 1 user group  12 nov  7 10:20 .
drwxr-xr-x 1 user group 208 nov  7 10:20 ..
drwxr-xr-x 1 user group  58 nov  7 10:20 bin
drwxr-xr-x 1 user group  88 nov  7 10:20 lib
user@linux-remote:/home/user/.vscode-server/extensions/vadimcn.vscode-lldb-1.10.0 > ll lldb/bin
total 20444
drwxr-xr-x 1 user group       58 nov  7 10:20 .
drwxr-xr-x 1 user group       12 nov  7 10:20 ..
-rwxr-xr-x 1 user group   459680 nov  7 10:20 lldb
-rwxr-xr-x 1 user group   252816 nov  7 10:20 lldb-argdumper
-rwxr-xr-x 1 user group 20214840 nov  7 10:20 lldb-server

And this is what it prints on the WSL:

user@wsl-remote:/home/user/.vscode-server/extensions/vadimcn.vscode-lldb-1.10.0 > ls -la lldb/
total 20
drwxr-xr-x  5 user user 4096 Jan 12 18:38 .
drwxr-xr-x  7 user user 4096 Jan 12 18:38 ..
drwxr-xr-x  2 user user 4096 Jan 12 18:38 DLLs
drwxr-xr-x  2 user user 4096 Jan 12 18:38 bin
drwxr-xr-x 28 user user 4096 Jan 12 18:38 lib
user@wsl-remote:/home/user/.vscode-server/extensions/vadimcn.vscode-lldb-1.10.0 > ls -la lldb/bin/
total 82796
drwxr-xr-x 2 user user     4096 Jan 12 18:38 .
drwxr-xr-x 5 user user     4096 Jan 12 18:38 ..
-rw-r--r-- 1 user user 79914496 Jan 12 18:38 liblldb.dll
-rw-r--r-- 1 user user    83968 Jan 12 18:38 lldb-argdumper.exe
-rw-r--r-- 1 user user   203264 Jan 12 18:38 lldb.exe
-rw-r--r-- 1 user user    52224 Jan 12 18:38 python3.dll
-rw-r--r-- 1 user user  4470272 Jan 12 18:38 python39.dll
-rw-r--r-- 1 user user    37256 Jan 12 18:38 vcruntime140_1.dll

Either Visual Studio Code or the extension installation routine failed to detect correctly the operating system.

Regards,
Alex.

[red-lonely-neuron]

I tried to use the system's lldb by using the instructions from here: https://github.com/vadimcn/codelldb/blob/master/MANUAL.md#alternate-lldb-backends

I have used /usr/lib/lldb as path, but I got an error. But I think this is a topic for another discussion. Please note I did install the lldb package.