Progress Report #26: rustc_codegen_gcc can now compile Rust for Linux! (
from to on 02 Oct 2023 00:20 +0000

We just accomplished two big milestones:

#rust on 02 Oct 2023 05:15 +0000 next

Great to see that this moves forward in a steady pace. And being able to compile Rust for Linux seems like a nice milestone, especially since many objections initially against rust in the kernel was about GCC support. on 02 Oct 2023 07:02 +0000 next

This is incredible. Congrats! on 02 Oct 2023 07:11 +0000

Now that you can compile and run tests, how performant are they compared to rustc+llvm? I know that thinLTO is not yet enable, and I guess a few other important optimisation, but I’m interested to know what we can already get. on 02 Oct 2023 18:46 +0000

Do you mean the performance of the tests themselves? If so, how would you suggest that I measure this? By just comparing the execution time? on 03 Oct 2023 10:16 +0000

Yes exacly. And I assume that the test suite of all of those project are long enough to average the usual jitter of wall time mesurement.

What I’m hoping to see is if rust+llvm vs rustc+gcc binary speed are within a few percents or if there is a real difference between the two (I’m expected that we eventually reach the former once thinLTO and other optimisations are implemented).

And while doing so it could also be possible to measure the difference in max RSS. on 03 Oct 2023 12:06 +0000

Good. I’ll attempt to do that for the next update.