Breakpoints not hit when debugging Rust with gdb in Visual Studio Code

Question

I started learning Rust, and I want to set up debugging in Visual Studio Code, but can't get breakpoints working. I use the Native Debug & RustyCode extensions for VS Code.

Here is my launch file:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Debug",
            "type": "gdb",
            "request": "launch",
            "target": "target/debug/test",
            "cwd": "${workspaceRoot}"
        }
    ]
}

But when I run this configuration, breakpoints do not get hit. I see in the debug console that the debugger started and the app ran fine, but there is a warning message "No Symbols loaded":

No symbol table is loaded.  Use the "file" command.
No symbol table is loaded.  Use the "file" command.
Running executable
[New Thread 32168.0x81e0]
[New Thread 32168.0x3360]
[New Thread 32168.0x61b8]
[New Thread 32168.0x8040]
The program "+ + * - /" calculates the value 1
[Thread 32168.0x61b8 exited with code 0]
[Thread 32168.0x3360 exited with code 0]
[Thread 32168.0x8040 exited with code 0]
[Inferior 1 (process 32168) exited normally]

Here is the source of the app I am using. How can I make breakpoints work?

I had a similar issue and I found that if I have hyphens in my project name (E.g. "abc-def"), then the code will run, but the breakpoints won't hit. — dinesh ygv
– dinesh ygv, Commented Aug 2, 2020 at 13:06

VelocityRa · Accepted Answer · 2017-01-15 15:41:17Z

6

I was having the same problem until I realized I was using an msvc build of rustc.

GDB is only supposed to work with gnu builds, so if you use rustup, the solution is as simple as rustup default stable (or beta/nightly). GNU is default, for msvc you would need to do stable-msvc).

If you don't want to use rustup you should just re-install a gnu build of Rust manually.

Edit: As noted in a comment below, don't forget to re-build!

edited Jan 15, 2017 at 15:41

answered Jan 8, 2017 at 16:22

VelocityRa

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2 Comments

Kevin Doyon Over a year ago

And if you're wondering why it still doesn't work like I was, don't forget to re-build!

dschaeffer Over a year ago

On Windows msvc is the default for rustup github.com/rust-lang-nursery/…

locka · Accepted Answer · 2017-07-02 07:17:39Z

2

I had similar problems with breakpoints and found that adding this line to the settings.json fixed it:

{
    "debug.allowBreakpointsEverywhere": true
}

I am also using Microsoft's C/C++ Debugger plugin, not the native one. It still works for GDB.

answered Jul 2, 2017 at 7:17

locka

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Comments

Freigus · Accepted Answer · 2021-04-01 04:51:05Z

0

As it was said before - gdb debugger doesn't work well with msvc build of rustc. Rustup defaults to msvc build on Windows right now.
To switch your default rustc build to gnu you have to run this command:

rustup default stable-gnu

answered Apr 1, 2021 at 4:51

Freigus

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