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Google says replacing C/C++ in firmware with Rust is easy
(www.theregister.com)
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The bedrock of modern civilizations is expensive to develop, buggy and unergonomic though.
If you make C run, you probably (I'm not sure, would have to verify) can make rust run. And if there isn't yet, there will probably soon be a C compiler written in rust, so you can choose to bootstrap from wherever you prefer.
C's ABI will probably last longer than C, since there is not a stable rust ABI though.
You cannot, today, build a Rust compiler directly from C, but you're right that people are working on it. See this recent post: https://notgull.net/announcing-dozer/
Edit: you can certainly bootstrap Rust from C via C++, as the article covers. I misinterpreted the comment above.
Currently it's a long chain from an early version of GCC to the latest one, then mrustc (in C++) which can compile rustc 1.54.0.
To be fair, in that article mentions the way to get rust from C. Sure, there is not a compiler written in C, but C is down there in the list of compilers needed for rust, so "just" need to compile some other compilers in the middle.
Ah, sorry, I misinterpreted your comment somehow. Yes, Rust is bootstrappable today, it's just a much longer process than it would be if there were a compiler written in C.