[$] Rust and GCC, two different ways

Developers working in languages like C or C++ have access to
two competing compilers — GCC and LLVM — either of which can usually get
the job done. Rust developers, though, are currently limited to the
LLVM-based rustc compiler. While rustc works well, there
are legitimate reasons for developers to wish for an alternative. As it
turns out, there are two different ways to compile Rust using GCC under
development, though neither is ready at the moment. Developers of both
approaches came to the 2021 Linux
Plumbers Conference to present the status of their work.