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Because there is often some confusion, note that there are two different projects in this space with different approaches.
The project discussed in the video above is a new front end to GCC (written in C++, as is typical for GCC frontends) and is developed here: https://github.com/Rust-GCC/gccrs
The other project involves plugging GCC's backend into the existing rustc frontend, and is developed here: https://github.com/rust-lang/rustc_codegen_gcc
Both projects intend to eventually allow Rust code to make use of GCC. But they will likely appeal to different sets of users: the former project appeals to people invested in the GCC ecosystem who want to use Rust without installing a whole separate toolchain, and the latter to people invested in the Rust ecosystem who want to benefit from GCC's broader target support.
Because there is often some confusion, note that there are two different projects in this space with different approaches.
The project discussed in the video above is a new front end to GCC (written in C++, as is typical for GCC frontends) and is developed here: https://github.com/Rust-GCC/gccrs
The other project involves plugging GCC's backend into the existing rustc frontend, and is developed here: https://github.com/rust-lang/rustc_codegen_gcc
Both projects intend to eventually allow Rust code to make use of GCC. But they will likely appeal to different sets of users: the former project appeals to people invested in the GCC ecosystem who want to use Rust without installing a whole separate toolchain, and the latter to people invested in the Rust ecosystem who want to benefit from GCC's broader target support.
As I understand it, Polonius is still intended to be the next version of the borrow checker.
The repostory is here: https://github.com/rust-lang/polonius
There doesn't seem to have been any meaningful development for well over a year.
There is some very recent discussion on Zulip which makes it look like there are at least two or three people interested in actively working on it.
https://rust-lang.zulipchat.com/#narrow/stream/186049-t-comp...