Clang: A C language family frontend for LLVM

Clang is a compiler frontend for the C, C++, Objective-C, and Objective-C++ programming languages. It is built as part of the LLVM project and shares LLVM's goals of modularity and reusability. Clang is designed to provide faster compile times, lower memory usage, and improved diagnostics compared to other compilers. It leverages LLVM's infrastructure for code generation and optimization, making it a robust and efficient tool for developing applications on various platforms, including iOS and macOS, which are relevant to AppCode's functionality as an IDE for these platforms.