Jonathan Brouwer
fe6816491f
Add the option to run UI tests with the parallel frontend This PR adds two arguments for tests: 1. `--parallel-frontend-threads`: specify `-Zthread` to compile test case (currently UI tests only) 2. `--iteration-count`: the number of times to run each test Also, due to the non-deterministic diagnostic orders and cycle errors, this PR adds the directive `//@ ignore-parallel-frontend` to ignore tests with cycle error when the parallel-frontend is enabled (by `--parallel-frontend-threads`) and enables `//@ compare-output-by-lines` by default. Context: [#t-compiler/parallel-rustc > Add the parallel front-end test suite @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/near/578781369) This PR should work with https://github.com/rust-lang/rust/pull/153797 together.
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