This post delves into compiling a single C++ source file to an object file using the Clang API. The code provided acts as a basic clang executable, handling -c and -S functionalities. It includes details on setting up the build with CMake and linking against necessary Clang and LLVM libraries. Additionally, it highlights utilizing LLVMInitialize functions for X86 code generation and navigating the complexities of diagnostics. The discussion touches on emitting assembly and object files, creating anonymous files in memory with memfd_create, and exploring the Diagnostics system. The post offers insights into handling macro expansions, warning/error reporting, and various lower-level API functions within the Clang ecosystem.
https://maskray.me/blog/2025-03-09-compiling-c++-with-clang-api