You can't compare rustc to a large application. Yes it's a large program, no it's nowhere near as large as Codex CLI. 1420 crates.
I just did a release build of Codex CLI with "lto = false" for codex CLI binary and code mode host only, and it took 75 minutes, of it 1063 seconds for the final rustc of codex bin. Windows Defender off. That's on a 4-core 2021-era Intel laptop with 32GB RAM and a half-TB SSD. And I can't let the build run at default concurrency, because rustc OOMs the machine, so this is with cargo jobs = 4. Regardless, the final rustc call is independent of that and that was 1063s with lto=false. Previous build was 90 minutes with default thinlto for the same CLI build.
How can Codex write fast-to-compile Rust code, do tell?? Do tell!
I just did a release build of Codex CLI with "lto = false" for codex CLI binary and code mode host only, and it took 75 minutes, of it 1063 seconds for the final rustc of codex bin. Windows Defender off. That's on a 4-core 2021-era Intel laptop with 32GB RAM and a half-TB SSD. And I can't let the build run at default concurrency, because rustc OOMs the machine, so this is with cargo jobs = 4. Regardless, the final rustc call is independent of that and that was 1063s with lto=false. Previous build was 90 minutes with default thinlto for the same CLI build.
How can Codex write fast-to-compile Rust code, do tell?? Do tell!