https://github.com/pizlonator/llvm-project-deluge/tree/deluge

Fil-C is a fanatically compatible memory-safe implementation of C and C++. Lots of software compiles and runs with Fil-C with zero or minimal changes. All memory safety errors are caught as Fil-C panics. Fil-C achieves this using a combination of concurrent garbage collection and invisible capabilities (each pointer in memory has a corresponding capability, not visible to the C address space). Every fundamental C operation (as seen in LLVM IR) is checked against the capability. Fil-C has no unsafe escape hatch of any kind.