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this post was submitted on 03 Sep 2024
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Switching everything from C to Rust because it has better memory safety is more akin to changing languages from English to Esperanto because it has gender neutral pronouns and other cool features. Maybe it's a good idea, but it's understandable that some people are reluctant.
I understand that position. I also understand how the words and phrases that the C community has used to communicate with the Rust community seems to be completely dismissive, not just reluctant.
I quoted what I did explicitly because of how a statement like that comes off to the person it's aimed at. It doesn't make them feel like they're on an even footing working on the same project with the overall goal of it becoming better.
I mean... not at all? Memory safety is huge for cybersecurity, buffer overflows and the like are common attack surfaces. C requires you to have deep knowledge of safe memory management practices and even then you can end up with memory issues. Rust was developed to avoid such issues entirely. I understand the reluctance but it feels to me like arguing "we should just stick with COBOL because it works."
People prefer what's familiar to them. Rust is completely foreign to them, the syntax is very different, the community is different (and often much younger), it still has many issues and is not ubiquitous, and many people are just slow/averse to change in general. So I absolutely understand the hesitation. And some just don't like it for other reasons like the syntax, learning curve or other reasons. There's also still a host of memory-related things Rust doesn't fix like stack overflows, leaks, bitflips, unsafe context code, and just bad coding practices in general.
I blame C++. When these kernel hackers hear about how they should switch to this shiny new language that's going to make their code so much cleanser and more manageable, I don't blame them for thinking it's all bullshit. It was last time.
To be fair, there's nothing wrong with only using the parts of C++ you want. If you avoid things like templates, exceptions, RTTI etc. then e.g. your compile times will not suffer like people always complain about, your error messages will not be cryptic, plus you'll have stronger typing, easier/safer lifetime management with ctor/dtors and easier to read code from class usage.
Personally I think Swift has great potential if it can get past the speed and cross-platform issues, as it was designed by (among others) some C++ committee folks, and so it feels a lot more familiar than say, Rust, plus it fixes a lot of long-standing issues.
There is also an Indian kernel fork that allows C++ drivers.