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Diffstat (limited to 'src/doc/rustc-dev-guide')
| -rw-r--r-- | src/doc/rustc-dev-guide/src/building/suggested.md | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/doc/rustc-dev-guide/src/building/suggested.md b/src/doc/rustc-dev-guide/src/building/suggested.md index 4491a3b7233..102586721d0 100644 --- a/src/doc/rustc-dev-guide/src/building/suggested.md +++ b/src/doc/rustc-dev-guide/src/building/suggested.md @@ -87,6 +87,22 @@ You can also use `--keep-stage 1` when running tests. Something like this: - Initial test run: `./x.py test -i --stage 1 src/test/ui` - Subsequent test run: `./x.py test -i --stage 1 src/test/ui --keep-stage 1` +## Fine-tuning optimizations + +Setting `optimize = false` makes the compiler too slow for tests. However, to +improve the test cycle, you can disable optimizations selectively only for the +crates you'll have to rebuild +([source](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/incremental.20compilation.20question/near/202712165)). +For example, when working on `rustc_mir_build`, the `rustc_mir_build` and +`rustc_driver` crates take the most time to incrementally rebuild. You could +therefore set the following in the root `Cargo.toml`: +```toml +[profile.release.package.rustc_mir_build] +opt-level = 0 +[profile.release.package.rustc_driver] +opt-level = 0 +``` + ## Working on multiple branches at the same time Working on multiple branches in parallel can be a little annoying, since |