Progress Report #26: rustc_codegen_gcc can now compile Rust for Linux! (blog.antoyo.xyz)

submitted 11 months ago by antoyo@programming.dev to c/rust@programming.dev

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We just accomplished two big milestones:

We can now compile Rust for Linux without any patches to cg_gcc.
We can compile, run and pass all the tests from the most popular crates. This is huge!

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[-] robinm@programming.dev 7 points 11 months ago

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.

[-] antoyo@programming.dev 2 points 11 months ago

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?

[-] robinm@programming.dev 2 points 11 months ago

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.