efcf4f9d2d
compiletest: Add an experimental new executor to replace libtest This PR adds a new "executor" to compiletest for running the list of collected tests, to eventually replace the current dependency on unstable libtest internals. The new executor is currently inactive by default. It must be activated explicitly by passing `-n` or `--new-executor` to compiletest, e.g. `./x test ui -- -n`. (After some amount of wider manual testing, the new executor will hopefully be made the default, and the libtest dependency can be removed. Contributors should not notice any change.) The new executor is a stripped-down rewrite of the subset of libtest needed by compiletest. # Supported functionality - Specifying the number of concurrent tests with `RUST_TEST_THREADS` - Filtering and skipping tests by name (substring or exact-match) - Forcibly running ignored tests with `--ignored` - Optional fail-fast with `--fail-fast` - JSON output, compatible with bootstrap's parser for libtest output - Running each test in its own thread - Short backtraces that ignore the executor itself - Slow test detection, with a hard-coded timeout of 60 seconds - Capturing stdout/stderr, via `#![feature(internal_output_capture)]` - Suppressing output capture with `--no-capture` # Unsupported functionality - Non-JSON output, as this is handled by bootstrap instead - Separate code path for concurrency=1, as the concurrent path should handle this case naturally - Fallback to running tests synchronously if new threads can't be spawned - Special handling of hosts that don't support basic functionality like threads or timers - Our ability to test *targets* should be unaffected - Graceful handling of some edge cases that could occur in arbitrary user-written unit tests, but would represent bugs in compiletest - Due to the current need for output capture, the new executor is still not entirely written in stable Rust --- r? jieyouxu
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