Can't step into printf() function GDB. WSL2 Ubuntu 24.04

Question

I'm currently running wsl2 ubuntu 24.04. I want to view the definition of the printf() function in GDB ( gdb ./main). But when I type the step command into printf(). It show this: enter image description here

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Reading symbols from ./main...
(gdb) start
Temporary breakpoint 1 at 0x1151: file main.c, line 5.
Starting program: /home/mak/C/main

This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.ubuntu.com>
Enable debuginfod for this session? (y or [n]) y
Debuginfod has been enabled.
To make this setting permanent, add 'set debuginfod enabled on' to .gdbinit.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Temporary breakpoint 1, main () at main.c:5
5               printf("Hello World!\n");
(gdb) step
Download failed: Invalid argument.  Continuing without source file ./libio/./libio/ioputs.c.
0x00007ffff7e2dbf8 in __GI__IO_puts (str=0x555555556004 "Hello World!") at ./libio/ioputs.c:35
warning: 35     ./libio/ioputs.c: No such file or directory
(gdb)

I wasn't really sure what was happening. It worked on my fedora41 when I was dualbooting window11/fedora.

This is my main.c file

#include <stdio.h>

int main(void) {

    printf("Hello World!\n");
    return 0;
}

Compiled it like this:

gcc -ggdb -O0 main.c -o main

I have also installed:

sudo apt install build-essential

Pasted this is my ~/.bashrc

export DEBUGINFOD_URLS="https://debuginfod.ubuntu.com"

Can someone help me?

I have tried export DEBUGINFOD_URLS="https://debuginfod.ubuntu.com" Even reinstall my wsl2.

Answer 1

Ubuntu's debuginfod landing page says:

About debuginfod

Currently, the service only provides DWARF information. There are plans for it to also index and serve source-code in the future.

So no source code for now. You will need to locally install the GLIBC source code and point gdb to it. See How can I get glibc/libstdc++ sources and set them up for gdb to find?