Why is GDB Missing Source Code When Debugging C Programs?

Missing Source Code Error in GDB

Problem:

When using GDB to debug C programs that throw exceptions, users encounter an error message indicating that raise.c is missing. This error prevents full source code debugging.

Fix:

To fix this issue and enable full source code debugging in GDB, follow these steps:

1. Install Debuginfo Version of Libc6:

Ensure that the libc6-dbg package is installed on your system. This package contains the debugging information for the C library.

2. Configure Package System for Source Code Handling:

If not already configured, enable your package system to download and process source code packages by:

• Installing dpkg-dev
• Enabling deb-src lines in /etc/apt/sources.list and running sudo apt update

3. Download Source Code for C Library:

• Create a directory for source code storage (e.g., /opt/src)
• Download the source code corresponding to the installed C library version using apt source libc6

4. Locate Source Code Directory and Set GDB Path:

• Determine the expected source code location using (gdb) info source command
• Move or symlink source code to the expected location or use (gdb) set substitute-path to redirect GDB to the correct path

With these steps complete, GDB should now correctly display source code when debugging C programs.

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