cdoctor: a tiny CMake C 'code doctor' built with GitHub Copilot CLI

This is a submission for the GitHub Copilot CLI Challenge.

What I Built

I built cdoctor, a small CLI + CMake-based sample project designed to make C/C++ build/debug loops faster.

The idea: run one command, get:

• a clean build attempt
• a readable summary of warnings/errors
• a proposed minimal patch (diff)
• a re-run to confirm the fix

Demo

Repo: https://github.com/raungeguieia/cdoctor

Quick demo (copy/paste):

cmake -S . -B build
cmake --build build
./build/cdoctor --help
./build/cdoctor scan sample_project/src/warn.c
ctest --test-dir build --output-on-failure

My Experience with GitHub Copilot CLI

I used Copilot CLI in the terminal to:

• summarize compiler output into actionable steps
• propose patches for common C/CMake problems
• generate small functions/tests quickly (then I reviewed and adjusted)

Example prompts I used:

• “Given this CMake/clang error, propose the smallest fix as a git diff.”
• “Add directory recursion to scan all .c/.h files on macOS+Linux.”
• “Write a CTest smoke test for the CLI.”

Notes for Judges

• This is intentionally small and easy to run.
• The sample project includes an intentional warning to prove the pipeline works.