Don't propagate __RUST_TEST_INVOKE to subprocess
When -Z panic_abort_tests is enabled, we use an environment variable to
tell the subprocess which test to invoke. If that subprocess then
invokes another Rust test binary, chaos ensues.
r? @alexcrichton
When -Z panic_abort_tests is enabled, we use an environment variable to
tell the subprocess which test to invoke. If that subprocess then
invokes another Rust test binary, chaos ensues.
Passes LLVM codegen and Emscripten link-time flags for exception
handling if and only if the panic strategy is `unwind`. Sets the
default panic strategy for Emscripten targets to `unwind`. Re-enables
tests that depend on unwinding support for Emscripten, including
`should_panic` tests.
- Compatible with Emscripten 1.38.46-upstream or later upstream.
- Refactors the Emscripten target spec to share code with other wasm
targets.
- Replaces the old incorrect wasm32 C call ABI with the correct one,
preserving the old one as wasm32_bindgen_compat for wasm-bindgen
compatibility.
- Updates the varargs ABI used by Emscripten and deletes the old one.
- Removes the obsolete wasm32-experimental-emscripten target.
- Uses EMCC_CFLAGS on CI to avoid the timeout problems with #63649.
Enhance report-time option
## Short overview
This PR is a follow-up to a previously closed#64714 PR.
## Changes introduced by this PR
* `libtest` now retrieves the type of the test within `TestDesc` (available types are: `UnitTest`, `IntegrationTest`, `DocTest`, `Unknown`).
* `--report-time` subcommand of the `libtest` now supports colored output (disabled by default).
* Colorized output depends on the threshold values. Default values (proposed by @wesleywiser):
- For unit-tests: 50ms warn/100ms critical,
- For integration-tests: 500ms warn/1000ms critical,
- For doctests: same as for integration tests,
- For unknown tests: `TEST_WARN_TIMEOUT_S` warn/ `TEST_WARN_TIMEOUT_S * 2` critical (it will only applied single-threaded mode, because otherwise test will be interrupted after reaching `TEST_WARN_TIMEOUT_S`).
- These values can be overrided by setting environment variables (since those thresholds are somewhat constant for every project, it's more flexible to use environment variables than command line arguments).
* New optional flag `--ensure-test-time` for `libtest`. With this flag applied, exectuion time limit excesss will cause test failure.
## What have not been done
There was a comment that it would be nice to have an entry in the Cargo book about it.
However, changes introduced by this PR (and #64663 in which `report-time` flag was added) aren't related directly to `cargo`, it's more about `libtest` itself.
I'm considering that [The Unstable Book](https://doc.rust-lang.org/unstable-book/) is more appropriate place, but not sure if I'm right (and if so, how exactly it should be described).
As one possible option, this PR may be merged without denoting it in the documentation, and in the next PR adding support of this feature to the `cargo` itself, I'll add a note in the Cargo book.
## Scope of this PR
Logical scope of this PR is `libtest` only. However, to get test types, I had to modify also `libsyntax_ext` and `librustdoc` for them to provide information about test type.
## Rationale
Rationale for colored output was submitted in #64714
Providing the information about kind of test was also proposed in #64714, and as an additional benefit this information may be useful for the tools using `libtest` (e.g. `cargo`).
Adding flag to treat time limits excess seems logical to me, so projects that do care about test execution time won't have to invent a wheel.
## Backward compatibility
All the changes are completely backward compatible.
## Demo
r? @wesleywiser
libtest: add --show-output flag to print stdout of successful tests
This pull request adds a new flag `--show-output` for tests to show the output of successful tests. For most formatters this was already supported just not exposed via the CLI (apparently only used by `librustdoc`). I've also added support for this option in the JSON formatter.
This kind of fixes https://github.com/rust-lang/rust/issues/54669 which wants `--format json` to work with `--nocapture`, which is... well, impossible. What this issue really calls for is `--show-output` as implemented here.
Since its inception rustbuild has always worked in three stages: one for
libstd, one for libtest, and one for rustc. These three stages were
architected around crates.io dependencies, where rustc wants to depend
on crates.io crates but said crates don't explicitly depend on libstd,
requiring a sysroot assembly step in the middle. This same logic was
applied for libtest where libtest wants to depend on crates.io crates
(`getopts`) but `getopts` didn't say that it depended on std, so it
needed `std` built ahead of time.
Lots of time has passed since the inception of rustbuild, however,
and we've since gotten to the point where even `std` itself is depending
on crates.io crates (albeit with some wonky configuration). This
commit applies the same logic to the two dependencies that the `test`
crate pulls in from crates.io, `getopts` and `unicode-width`. Over the
many years since rustbuild's inception `unicode-width` was the only
dependency picked up by the `test` crate, so the extra configuration
necessary to get crates building in this crate graph is unlikely to be
too much of a burden on developers.
After this patch it means that there are now only two build phasese of
rustbuild, one for libstd and one for rustc. The libtest/libproc_macro
build phase is all lumped into one now with `std`.
This was originally motivated by rust-lang/cargo#7216 where Cargo was
having to deal with synthesizing dependency edges but this commit makes
them explicit in this repository.
