Handle core dumps output in QEMU user mode
In addition to the whole-system emulation/virtualization, QEMU also supports user-mode emulation, where the emulation happens as a normal process inside the parent system. This allows running most tests by simply spawning remote-test-server inside user-mode emulation.
Unfortunately, QEMU always writes its own message in addition to the system one when a core dump happens, which breaks a few tests which match on the exact output of the system.
This PR changes those tests to strip the (possible) QEMU output before checking if the output is expected.
- Make the structure of the two variants more similar.
- Add some comments.
- Move various conditional `use` items inside the function that uses
them.
- Inline some closures.
Partially fix `src/test/run-make/coverage-reports` when cross-compiling
The test does not work on cross-compiled targets because the --target flag was not passed to rustc inside the test. This commit fixes that by adding the flag to the invocations.
Note that the test still fails on cross-compiled targets using remote-test, as remote-test is not capable (yet) of sending back to the host system the `*.profraw` file generated by the instrumentation.
Because of that, this is only a partial fix, and the test has been ignored on cross-compilation.
Optimize `slice_iter.copied().next_chunk()`
```
OLD:
test iter::bench_copied_array_chunks ... bench: 371 ns/iter (+/- 7)
NEW:
test iter::bench_copied_array_chunks ... bench: 31 ns/iter (+/- 0)
```
The default `next_chunk` implementation suffers from having to assemble the array byte by byte via `next()`, checking the `Option<&T>` and then dereferencing `&T`. The specialization copies the chunk directly from the slice.
Rollup of 6 pull requests
Successful merges:
- #101889 (doc: rewrite doc for uint::{carrying_add,borrowing_sub})
- #102507 (More slice::partition_point examples)
- #103164 (rustdoc: remove CSS ``@media` (min-width: 701px)`)
- #103189 (Clean up code-color and headers-color rustdoc GUI tests)
- #103203 (Retrieve LLVM version from llvm-filecheck binary if it is not set yet)
- #103204 (Add some more autolabels)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Clean up rustdoc startup
Startup is pretty hairy, in both rustdoc and rustc. The first commit here improves the rustdoc situation quite a bit. The remaining commits are smaller but also help.
Best reviewed one commit at a time.
r? `@jyn514`
By moving `RenderOptions` out of `Option`, because the two structs' uses
are almost entirely separate.
The only complication is that `unstable_features` is needed in both
structs, but it's a tiny `Copy` type so its duplication seems fine.
It turns out `markdown::render` is more complex than it first appears,
because it can invoke `doctest::make_test`, which requires session
globals and a thread pool.
So this commit changes it to use `interface::run_compiler`. Three of the
four paths in `main_args` now use `interface::run_compiler`.
rustc's startup has several layers, including:
- `interface::run_compiler` passes a closure, `f`, to
`run_in_thread_pool_with_globals`, which creates a thread pool, sets
up session globals, and passes `f` to `create_compiler_and_run`.
- `create_compiler_and_run` creates a `Session`, a `Compiler`, sets the
source map, and calls `f`.
rustdoc is a bit different.
- `main_args` calls `main_options` via
`run_in_thread_pool_with_globals`, which (again) creates a thread pool
(hardcoded to a single thread!) and sets up session globals.
- `main_options` has four different paths.
- The second one calls `interface::run_compiler`, which redoes the
`run_in_thread_pool_with_globals`! This is bad.
- The fourth one calls `interface::create_compiler_and_run`, which is
reasonable.
- The first and third ones don't do anything of note involving the
above functions, except for some symbol interning which requires
session globals.
In other words, rustdoc calls into `rustc_interface` at three different
levels. It's a bit confused, and feels like code where functionality has
been added by different people at different times without fully
understanding how the globally accessible stuff is set up.
This commit tidies things up. It removes the
`run_in_thread_pool_with_globals` call in `main_args`, and adjust the
four paths in `main_options` as follows.
- `markdown::test` calls `test::test_main`, which provides its own
parallelism and so doesn't need a thread pool. It had one small use of
symbol interning, which required session globals, but the commit
removes this.
- `doctest::run` already calls `interface::run_compiler`, so it doesn't
need further adjustment.
- `markdown::render` is simple but needs session globals for interning
(which can't easily be removed), so it's now wrapped in
`create_session_globals_then`.
- The fourth path now uses `interface::run_compiler`, which is
equivalent to the old `run_in_thread_pool_with_globals` +
`create_compiler_and_run` pairing.
Retrieve LLVM version from llvm-filecheck binary if it is not set yet
In `rustc_codegen_gcc`, we run the `ASM` test suite. The problem is that, if a too recent version of the `llvm-filecheck` binary is provided, an extra argument needs to be passed and the to detect this version, it currently only expects a `--llvm-version` argument. With this, the version can be determined directly from the `llvm-filecheck` binary.
r? ``@Amanieu``
More slice::partition_point examples
After seeing the discussion of `binary_search` vs `partition_point` in #101999, I thought some more example code could be helpful.
doc: rewrite doc for uint::{carrying_add,borrowing_sub}
Reword the documentation for bigint helper methods `uint::{carrying_add,borrowing_sub}` (#85532).
The examples were also rewritten to demonstrate how the methods can be used in bignum arithmetic. No loops are used in the examples, but the variable names were chosen to include indices so that it is clear how this can be used in a loop if required.
Also, previously `carrying_add` had an example to say that if the input carry is false, the method is equivalent to `overflowing_add`. While the note was kept, the example was removed and an extra note was added to make sure this equivalence is not assumed for signed integers as well.
This change tweaks the CSS to apply most of its styles to `.sidebar h2`,
cleaning up a few redundant rules from `.mobile-topbar .location` and
restoring useful navigation aids in mobile mode.
The illumos linker does not support --strip-debug
When building and testing rust 1.64.0 on illumos, we saw a large number of failing tests associated with:
```
= note: ld: fatal: unrecognized option '--strip-debug'
ld: fatal: use the -z help option for usage information
collect2: error: ld returned 1 exit status
```
The illumos linker does not support the `--strip-debug` option (although it does support `--strip-all`).
