C Compiler Explorer (Flask Backend)

A minimal web-based compiler explorer for C code, built with Python (Flask). This app supports compilation of user-submitted C code using either gcc or clang, and provides output at different stages like preprocessing, assembly, LLVM IR, or binary object code.

Features

• 🧠 Live compilation of C code via web UI
• 🛠️ Supports:
  • Preprocessing (-E)
  • Assembly output (-S)
  • LLVM IR (clang)
  • Binary object files (-c)
• 🔄 Output returned as plain text or hex-encoded binary
• 🔐 Server runs locally by default (localhost only)

Technologies Used

• Python 3.12+
• Flask
• gcc and/or clang (must be installed on your system)

Setup Instructions

1. Install Python dependencies

pip install -r requirements.txt

2. Run the server

python app.py

This starts the Flask server at http://127.0.0.1:8080

3. Visit in your browser

Open: http://127.0.0.1:8080. Use the interface to write C code, choose a compiler and mode, and view the results.

Notes

• Object files are not executed or linked; binary output is returned as a hex string.
• Compilation errors are shown in the output pane.
• I wrote this on a Linux box, and it only compiles to ELF format. If you need PE check out https://godbolt.org. They also have a vast range of coding languages and other options for you to choose from.