Debugging process got stuck at predefined task

[BorisPolonsky]

Issue Type: Bug

Brief

Debugging stage never starts as building stage defined in task got stuck. The terminal prints out
things like Executing task: /usr/bin/g++ -g <path-to-my-workplace>/main.cpp -o /<path-to-my-workplace>/main and it stays forever.

If I copy, paste and execute the /usr/bin/g++ -g <path-to-my-workplace>/main.cpp -o /<path-to-my-workplace>/main part in my own terminal the program got compiled successfully, however. So I assume it's not either environment setting nor missing dependency e.t.c. that causes the problem.

Steps to replicate

• Set up main.cpp, launch.json and tasks.json as specified below:

main.cpp

#include <iostream>
using namespace std;


int main()
{
    cout << "hello world!" << endl;
    return 0;
}

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": "g++ - Build and debug active file",
            "type": "cppdbg",
            "request": "launch",
            "program": "${fileDirname}/${fileBasenameNoExtension}",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${workspaceFolder}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "gdb",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ],
            "preLaunchTask": "C/C++: g++ build active file",
            "miDebuggerPath": "/usr/bin/gdb"
        }
    ]
}

task.json

{
    "tasks": [
        {
            "type": "shell",
            "label": "C/C++: g++ build active file",
            "command": "/usr/bin/g++",
            "args": [
                "-g",
                "${file}",
                "-o",
                "${fileDirname}/${fileBasenameNoExtension}"
            ],
            "options": {
                "cwd": "${workspaceFolder}"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "detail": "Build and debug main"
        }
    ],
    "version": "2.0.0"
}

• Hit F5

The task got stuck no matter what command I specified in task.json, even specifying a simple ls command (i.e. "command": "ls") .

Extension version: 0.28.3
VS Code version: Code 1.45.1 (5763d909d5f12fe19f215cbfdd29a91c0fa9208a, 2020-05-14T08:27:22.494Z)
OS version: Linux x64 5.3.0-53-generic snap

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz (4 x 3099)
GPU Status	2d_canvas: unavailable_software flash_3d: disabled_software flash_stage3d: disabled_software flash_stage3d_baseline: disabled_software gpu_compositing: disabled_software multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: disabled_off rasterization: disabled_software skia_renderer: disabled_off_ok video_decode: disabled_software viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off_ok webgl: unavailable_software webgl2: unavailable_software
Load (avg)	2, 2, 2
Memory (System)	7.66GB (0.28GB free)
Process Argv	--force-user-env --no-sandbox --unity-launch --no-sandbox
Screen Reader	no
VM	0%
DESKTOP_SESSION	ubuntu
XDG_CURRENT_DESKTOP	Unity
XDG_SESSION_DESKTOP	ubuntu
XDG_SESSION_TYPE	x11

[WardenGnaw]

Does debugging work if you build on the command line and remove "preLaunchTask": "C/C++: g++ build active file" in your launch.json?

[BorisPolonsky]

Does debugging work if you build on the command line and remove "preLaunchTask": "C/C++: g++ build active file" in your launch.json?

No, I commented //"preLaunchTask": "C/C++: g++ build active file", vscode prompts that Program <path-to-workspace>/.vscode/launch does not exist. Yet if if continue to click on the open launch.json button, it pops out correct file, however. It seems like a new bug to me.
`

[WardenGnaw]

You will need to focus your window on main.cpp and then select F5.

[BorisPolonsky]

You will need to focus your window on main.cpp and then select F5.

Does debugging work if you build on the command line and remove "preLaunchTask": "C/C++: g++ build active file" in your launch.json?

Sorry, I've just noticed that.
The answer is no.
I commented //"preLaunchTask": "C/C++: g++ build active file", and ran /usr/bin/g++ -g $workspace/main.cpp --std=c++11 -o $workspace/main in my terminal. I focused window on main.cpp, and hitted F5, VSCode popped out buttons for debugging (e.g. step, stop) but it does not seem to pasue at any breakpoint and I got no output. It just stuck.

[BorisPolonsky]

I reinstalled my OS and VSCode. I'm now on ubuntu 20.04 (instead of 18.04) and the problem's gone. I assume it's something with 18.04. Didn't know if someone else can replicate this problem. Closing now.