ci: add a runner for vanilla LLVM 17
For CI cost, this can be seen as replacing the llvm-14 runner we dropped in #114148.
Also, I've set `IS_NOT_LATEST_LLVM` in the llvm-16 runner, since that's not the latest anymore.
Remove wasm32-unknown-emscripten tests from CI
This builder tested the wasm32-unknown-emscripten target, which is tier 2 (and so not eligible for testing). In the recent beta [promotion](https://github.com/rust-lang/rust/pull/116362#issuecomment-1744960904), we ran into a problem with this target: emscripten doesn't support passing environment variables into the std environment, so we can't enable RUSTC_BOOTSTRAP for libtest in order to pass -Zunstable-options.
We worked around this for the beta/stable branches, but given this problem, and its tier 2 status, just dropping the target's tests entirely seems warranted. Downgrading to tier 3 may also be a good idea, but that is a separate conversation not proposed here.
This builder tested the wasm32-unknown-emscripten target, which is tier
2 (and so not eligible for testing). In the recent beta promotion, we
ran into a problem with this target: emscripten doesn't support
passing environment variables into the std environment, so we can't
enable RUSTC_BOOTSTRAP for libtest in order to pass -Zunstable-options.
We worked around this for the beta/stable branches, but given this
problem, and its tier 2 status, just dropping the target's tests
entirely seems warranted. Downgrading to tier 3 may also be a good idea,
but that is a separate conversation not proposed here.
Raise minimum supported Apple OS versions
This implements the proposal to raise the minimum supported Apple OS versions as laid out in the now-completed MCP (https://github.com/rust-lang/compiler-team/issues/556).
As of this PR, rustc and the stdlib now support these versions as the baseline:
- macOS: 10.12 Sierra
- iOS: 10
- tvOS: 10
- watchOS: 5 (Unchanged)
In addition to everything this breaks indirectly, these changes also erase the `armv7-apple-ios` target (currently tier 3) because the oldest supported iOS device now uses ARMv7s. Not sure what the policy around tier3 target removal is but shimming it is not an option due to the linker refusing.
[Per comment](https://github.com/rust-lang/compiler-team/issues/556#issuecomment-1297175073), this requires a FCP to merge. cc `@wesleywiser.`
CI: use smaller machines in PR runs
mingw-check job-linux-16c -> job-linux-4c
~job-linux-4c 20 min in auto job
~job-linux-16c 13 min in pr job
with current pr regressed to almost 21 min, it's ok.
mingw-check-tidy job-linux-16c -> job-linux-4c small enough, so reduce to minimal
~ job-linux-16c 3 min
with current pr regressed to almost 5 min, it's ok.
x86_64-gnu-tools job-linux-16c this is top job by time in PR, so don't touch it
~ job-linux-8c 1.30 hour in auto job
~ job-linux-16c 1 hour in pr job (affected by #114613, actual time ~ 30 min)
x86_64-gnu-llvm-15 job-linux-16c don't change too
~ job-linux-8c 1.30 hour in auto job
~ job-linux-16c 30 min in pr job
Noticed while working on https://github.com/rust-lang/rust/pull/114621, so current time affected by always rebuilded docker images (but pr images always rebuilded before too, so nvm)
Mention style for new syntax in tracking issue template
`@rust-lang/style` would like the specification of new syntax in the style guide to be part of the feature stabilization process, in order to avoid situations where new syntax is stabilized and it never has style specified or formatting implemented for it. This most recently occurred with [let-else](https://blog.rust-lang.org/2023/07/01/rustfmt-supports-let-else-statements.html). We've made a lot of progress with the [nightly style procedure](https://github.com/rust-lang/style-team/blob/master/nightly-style-procedure.md) to unblock rustfmt from experimenting with formatting for new syntax, and T-style's existence means we actually have people who are willing and qualified to make decisions about formatting specification.
This check-box should also perhaps include "formatting support implemented in rustfmt", but that's really up to `@rust-lang/rustfmt,` so I'm not volunteering them for any new responsibilities in this PR just yet.
Putting this up mostly to discuss with T-lang, though feedback welcome from anyone.
---
As more of an implementation detail: alternatively, instead of a this could be just added to the existing rustc-dev-guide chapter(s) on stabilization.
r? `@ghost`
CI: include workflow name in concurrency group
Currently, this won't change anything, because we only have one relevant workflow (`CI`), but for future proofing we should probably include the workflow name in the concurrency group.
Found by ``@klensy`` [here](https://github.com/rust-lang/rust/pull/113059#discussion_r1247213606).
Currently, this won't change anything, because we only have one relevant workflow (`CI`), but for future proofing we should probably include the workflow name in the concurrency group.
Github action to periodically `cargo update` to keep dependencies current
Opens a PR periodically with the results of `cargo update`. If an unmerged PR for the branch `cargo_update` already exists, it will edit then reopen it if necessary.
~~This also uses [`cargo-upgrades`](https://gitlab.com/kornelski/cargo-upgrades) to provide a list of available major upgrades in the PR body.~~
It includes the list of changes output by `cargo update` in the commit message and PR body. Note that this output is currently sub-optimal due to https://github.com/rust-lang/cargo/issues/9408, but if updates are made more regularly that is less likely to show up.
Example PR: https://github.com/pitaj/rust/pull/2
Example action run: https://github.com/pitaj/rust/actions/runs/5035731903
Prior discussion: https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/dependabot.20updates.3F
Up for discussion:
- What period do we want? Currently weekly
- What user should it use? Currently "Github Actions"
- Do we need the extra security of provided by executing `cargo update` and `cargo-upgrades` in a separate job?
If not I can simplify it to not need artifacts.
- PR message wording
- PR should probably always be `rollup=always`?
- What branch should it use?
- What should it do if no updates are available? Currently fails the job on empty commit
- Should the yml file live in `src/ci` instead of directly under workflows?
- ~~Is using the latest nightly toolchain enough to ensure compatibility with `Cargo.lock` and `Cargo.toml`s in master?~~
Now pulls the bootstrap version from stage0.json
r? infra
- Keep Cargo.lock dependencies current
- Presents output from `cargo update` in commit and PR
- Edit existing open PR, otherwise open a new one
- Skip if existing open PR is S-waiting-on-bors
