Debugging C/C++ Language Not Hitting Breakpoints

Question

I have the following file overflow.c that I'm trying to debug through breakpoints in Visual Studio Code macOS:

#include <stdio.h>

int main(void) {
    int n = 1;
    for (int i = 0; i < 64; i++)
    {
        printf("%i\n", n);
        n = n * 2;
    }
    return 0;
}

I've built it by typing make overflow in the terminal, which returns

cc   overflow.o   -o overflow

And I can do ./overflow in the terminal to run it, which works. I have the C/C++ extension by Microsoft installed. My launch.json looks like the following:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "C Run",
            "type": "cppdbg",
            "request": "launch",
            "program": "${workspaceRoot}/overflow",
            "args": [],
            "stopAtEntry": true,
            "cwd": "${workspaceRoot}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "lldb"
        }
    ]
}

When I debug using the "C Run" configuration, it runs my entire code without hitting any of my breakpoints (found here)

The "C Attach" is for attaching to an already-running app, which isn't applicable here. I've added the following to my PATH:

PATH="/Applications/Xcode.app/Contents/Developer/usr/bin:${PATH}"

My debug console after debugging "C Run" config loads bunch of symbols, returns output from my print statements, and ends with

The program '/Users/ahlam/Downloads/workspace/overflow' has exited with code 0 (0x00000000).

EDIT: I've also tried it with C++ and it has the same behavior. Made a hello.cpp, built using g++ hello.cpp and debugging just ran the entire code without hitting any breakpoints.

Any help is appreciated.

I went to the Debug menu, and clicked on the Green play button, hovering over it says, Start Debugging, so I think I'm debugging. Is there a different workflow you had in mind? — Ahlam Javed
– Ahlam Javed, Commented Oct 7, 2017 at 18:33

azizj · Accepted Answer · 2017-10-07 19:04:48Z

3

You need to generate source-level debug information, which you can do by using the -g flag in clang:

clang -g overflow.c -o overflow

Do that instead of make overflow. You'll see a folder called overflow.dSYM in your directory. Debugging should now work.

answered Oct 7, 2017 at 19:04

azizj

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1 Comment

Mahdad Baghani Over a year ago

thank you for this answer. I also want to state that the same thing is applicable to g++ when compiling in linux environments. if you use -g arg for g++ or clang, you'll get nice debugging in vscode.

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