Improve allowness of the unexpected_cfgs lint
This pull-request improve the allowness (`#[allow(...)]`) of the `unexpected_cfgs` lint.
Before this PR only crate level `#![allow(unexpected_cfgs)]` worked, now with this PR it also work when put around `cfg!` or if it is in a upper level. Making it work ~for the attributes `cfg`, `cfg_attr`, ...~ for the same level is awkward as the current code is design to give "Some parent node that is close to this macro call" (cf. https://doc.rust-lang.org/nightly/nightly-rustc/rustc_expand/base/struct.ExpansionData.html) meaning that allow on the same line as an attribute won't work. I'm note even sure if this would be possible.
Found while working on https://github.com/rust-lang/rust/pull/94298.
r? ````````@petrochenkov````````
Adt copy suggestions
Previously we've only suggested adding `Copy` bounds when the type being moved/copied is a type parameter (generic). With this PR we also suggest adding bounds when a type
- Can be copy
- All predicates that need to be satisfied for that are based on type params
i.e. we will suggest `T: Copy` for `Option<T>`, but won't suggest anything for `Option<String>`.
An example:
```rust
fn duplicate<T>(t: Option<T>) -> (Option<T>, Option<T>) {
(t, t)
}
```
New error (current compiler doesn't provide `help`:):
```text
error[E0382]: use of moved value: `t`
--> t.rs:2:9
|
1 | fn duplicate<T>(t: Option<T>) -> (Option<T>, Option<T>) {
| - move occurs because `t` has type `Option<T>`, which does not implement the `Copy` trait
2 | (t, t)
| - ^ value used here after move
| |
| value moved here
|
help: consider restricting type parameter `T`
|
1 | fn duplicate<T: Copy>(t: Option<T>) -> (Option<T>, Option<T>) {
| ++++++
```
Fixes#93623
r? ``````````@estebank``````````
``````````@rustbot`````````` label +A-diagnostics +A-suggestion-diagnostics +C-enhancement
----
I'm not at all sure if this is the right implementation for this kind of suggestion, but it seems to work :')
Rename `BorrowedFd::borrow_raw_fd` to `BorrowedFd::borrow_raw`.
Also, rename `BorrowedHandle::borrow_raw_handle` and
`BorrowedSocket::borrow_raw_socket` to `BorrowedHandle::borrow_raw` and
`BorrowedSocket::borrow_raw`.
This is just a minor rename to reduce redundancy in the user code calling
these functions, and to eliminate an inessential difference between
`BorrowedFd` code and `BorrowedHandle`/`BorrowedSocket` code.
While here, add a simple test exercising `BorrowedFd::borrow_raw_fd`.
r? ``````@joshtriplett``````
Add documentation about `BorrowedFd::to_owned`.
Following up on #88564, this adds documentation explaining why
`BorrowedFd::to_owned` returns another `BorrowedFd` rather than an
`OwnedFd`. And similar for `BorrowedHandle` and `BorrowedSocket`.
r? `````@joshtriplett`````
Error if submodule fetch fails.
In CI, if fetching a submodule fails, the script would exit successfully. Later parts of the build will fail due to the missing files, but it is a bit confusing, and I think it would be better to error out earlier.
The reason is that in bash, `wait` without arguments will exit 0 even if a background job exits with an error. The solution here is to wait on each individual job, which will return the exit code of the job.
This was encountered in #92177.
Remove LLVM attribute removal
This was necessary before, because `declare_raw_fn` would always apply
the default optimization attributes to every declared function.
Then `attributes::from_fn_attrs` would have to remove the default
attributes in the case of, e.g. `#[optimize(speed)]` in a `-Os` build.
(see [`src/test/codegen/optimize-attr-1.rs`](03a8cc7df1/src/test/codegen/optimize-attr-1.rs (L33)))
However, every relevant callsite of `declare_raw_fn` (i.e. where we
actually generate code for the function, and not e.g. a call to an
intrinsic, where optimization attributes don't [?] matter)
calls `from_fn_attrs`, so we can remove the attribute setting
from `declare_raw_fn`, and rely on `from_fn_attrs` to apply the correct
attributes all at once.
r? `@ghost` (blocked on #94221)
`@rustbot` label S-blocked
Rollup of 9 pull requests
Successful merges:
- #94464 (Suggest adding a new lifetime parameter when two elided lifetimes should match up for traits and impls.)
- #94476 (7 - Make more use of `let_chains`)
- #94478 (Fix panic when handling intra doc links generated from macro)
- #94482 (compiler: fix some typos)
- #94490 (Update books)
- #94496 (tests: accept llvm intrinsic in align-checking test)
- #94498 (9 - Make more use of `let_chains`)
- #94503 (Provide C FFI types via core::ffi, not just in std)
- #94513 (update Miri)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Provide C FFI types via core::ffi, not just in std
Tracking issue: https://github.com/rust-lang/rust/issues/94501
The ability to interoperate with C code via FFI is not limited to crates
using std; this allows using these types without std.
The existing types in `std::os::raw` become type aliases for the ones in
`core::ffi`. This uses type aliases rather than re-exports, to allow the
std types to remain stable while the core types are unstable.
This also moves the currently unstable `NonZero_` variants and
`c_size_t`/`c_ssize_t`/`c_ptrdiff_t` types to `core::ffi`, while leaving
them unstable.
Historically, we didn't do this because these types are target-dependent.
However, `core` itself is also target-dependent. `core` should not call
any OS services, but it knows the target and the target's ABI.
tests: accept llvm intrinsic in align-checking test
This changed in upstream change https://reviews.llvm.org/D98152 (aka
a266af7211)
wherein LLVM got smarter about using intrinsics. As best I can tell the
change I've made here preserves the intent of the test on LLVM 14 and
before while also passing on LLVM 15 and later.
Update books
## nomicon
1 commits in 90993eeac93dbf9388992de92965f99cf6f29a03..f6d6126fc96ecf4a7f7d22da330df9506293b0d0
2022-02-13 12:44:12 +0900 to 2022-02-26 02:21:21 +0900
- ffi: explicitly declare hello_from_rust for C99 (rust-lang/nomicon#343)
## reference
20 commits in 70fc73a6b908e08e66aa0306856c5211312f6c05..9d289c05fce7254b99c6a0d354d84abb7fd7a032
2022-02-14 19:33:01 -0800 to 2022-02-23 08:58:20 -0800
- Fix typo in `functions.md` (rust-lang/reference#1173)
- Fix CI
- Unify global_asm/asm directive list
- Update src/inline-assembly.md
- Update src/inline-assembly.md
- Fix changes unintentional reverted in d5d3d80
- Add note about operand interpolations
- Sort lists, add syntax control directives
- Add another missed batch suggestion
- Add missed batch suggestion
- Apply suggestions from code review
- Add .type, .size, and .p2align
- Reformat directive lists
- Add `.inst` directive
- Add missing directives
- Add additional directives in use
- Add `.fill` directive
- Style fixes
- Fix code block
- Add supported Directives list
## book
13 commits in 67b768c0b660a069a45f0e5d8ae2f679df1022ab..3f255ed40b8c82a0434088568fbed270dc31bf00
2022-02-09 21:52:41 -0500 to 2022-02-27 21:26:12 -0500
- Add a back reference about enum variant initializer fns. Fixesrust-lang/book#800.
- Update ch01-03-hello-cargo.md
- ch03-05: Add definite article for the block of code
- Change variable names from "slice" to "values"
- Remove reference to advanced lifetime section that no longer exists
- Fix link to go to the right newtype section
- Remove confusing and redundant part of a sentence about newtypes
- Make transition less repetitive
- Correct wording about associated functions.
- Remove unnecessary extern crate proc_macro
- Clarify that this code is defining, not using a procedural macro
- Add manual regeneration steps for cargo new test
- Update Listing 11-1 to reflect current contents
## rust-by-example
11 commits in 18c0055b8aea49391e8f758a4400097999c9cf1e..2a928483a20bb306a7399c0468234db90d89afb5
2022-01-19 08:51:55 -0300 to 2022-02-28 11:36:59 -0300
- Update destructure_slice.md (rust-lang/rust-by-example#1513)
- Update iter_find.md (rust-lang/rust-by-example#1512)
- Add an example of collecting errors while iterating successes (rust-lang/rust-by-example#1509)
- Fix broken link on asm (rust-lang/rust-by-example#1508)
- Update abort_unwind.md (rust-lang/rust-by-example#1505)
- Remove duplicate text in asm.md (rust-lang/rust-by-example#1506)
- Improve asm clobber example (rust-lang/rust-by-example#1504)
- Add +1 to next_age (rust-lang/rust-by-example#1503)
- fix comment on into_iter() for arrays (rust-lang/rust-by-example#1502)
- Added new Rust 1.58 direct format args (rust-lang/rust-by-example#1501)
- documentation for cfg_panic (rust-lang/rust-by-example#1500)
## rustc-dev-guide
13 commits in 62f58394ba7b203f55ac35ddcc4c0b79578f5706..32f2a5b4e7545318846185198542230170dd8a42
2022-02-11 08:42:50 -0500 to 2022-03-01 10:45:24 -0600
- Add architecture suggestion for Apple silicon (rust-lang/rustc-dev-guide#1320)
- cargo timings has been stabilized (rust-lang/rustc-dev-guide#1319)
- Add known-bug header. (rust-lang/rustc-dev-guide#1311)
- Fix typo (rust-lang/rustc-dev-guide#1315)
- Typo (rust-lang/rustc-dev-guide#1313)
- instrument-coverage has been stabilized.
- symbol-mangling-version has been stabilized
- Fix `Ty` link (rust-lang/rustc-dev-guide#1308)
- Edit glossary (rust-lang/rustc-dev-guide#1302)
- Fix heading levels in the query chapter (rust-lang/rustc-dev-guide#1305)
- Fix link
- Edit "Queries" chapter (rust-lang/rustc-dev-guide#1301)
- Link to The Rust Performance Book (rust-lang/rustc-dev-guide#1300)
## edition-guide
1 commits in beea0a3cdc3885375342fd010f9ad658e6a5e09a..c55611dd6c58bdeb52423b5c52fd0f3c93615ba8
2021-12-05 07:06:45 -0800 to 2022-02-21 14:21:39 +0100
- Remove `+nightly` for `cargo new` (rust-lang/edition-guide#276)
Suggest adding a new lifetime parameter when two elided lifetimes should match up for traits and impls.
Suggest adding a new lifetime parameter when two elided lifetimes should match up for functions in traits and impls.
Issue #94462
Direct users towards using Rust target feature names in CLI
This PR consists of a couple of changes on how we handle target features.
In particular there is a bug-fix wherein we avoid passing through features that aren't prefixed by `+` or `-` to LLVM. These appear to be causing LLVM to assert, which is pretty poor a behaviour (and also makes it pretty clear we expect feature names to be prefixed).
The other commit, I anticipate to be somewhat more controversial is outputting a warning when users specify a LLVM-specific, or otherwise unknown, feature name on the CLI. In those situations we request users to either replace it with a known Rust feature name (e.g. `bmi` -> `bmi1`) or file a feature request. I've a couple motivations for this: first of all, if users are specifying these features on the command line, I'm pretty confident there is also a need for these features to be usable via `#[cfg(target_feature)]` machinery. And second, we're growing a fair number of backends recently and having ability to provide some sort of unified-ish interface in this place seems pretty useful to me.
Sponsored by: standard.ai
When CStr moves to core with an alias in std, this can link to
`crate::ffi::CStr`. However, linking in the reverse direction (from core
to std) requires a relative path, and that path can't work from both
core::ffi and std::os::raw (different number of `../` traversals
required).
The ability to interoperate with C code via FFI is not limited to crates
using std; this allows using these types without std.
The existing types in `std::os::raw` become type aliases for the ones in
`core::ffi`. This uses type aliases rather than re-exports, to allow the
std types to remain stable while the core types are unstable.
This also moves the currently unstable `NonZero_` variants and
`c_size_t`/`c_ssize_t`/`c_ptrdiff_t` types to `core::ffi`, while leaving
them unstable.
core can't depend on external crates the way std can. Rather than revert
usage of cfg_if, add a copy of it to core. This does not export our
copy, even unstably; such a change could occur in a later commit.
This changed in upstream change https://reviews.llvm.org/D98152 (aka
a266af7211)
wherein LLVM got smarter about using intrinsics. As best I can tell the
change I've made here preserves the intent of the test on LLVM 14 and
before while also passing on LLVM 15 and later.
For some reason, `tar` behaves differently in such a way that it does
not create symlinks on Windows correctly, resulting in
`Cannot create symlink to 'ld.gold': No such file or directory`
errors.
Previously we've only suggested adding `Copy` bounds when the type being
moved/copied is a type parameter (generic). With this commit we also
suggest adding bounds when a type
- Can be copy
- All predicates that need to be satisfied for that are based on type
params
i.e. we will suggest `T: Copy` for `Option<T>`, but won't suggest
anything for `Option<String>`.
Future work: it would be nice to also suggest adding `.clone()` calls
Rollup of 3 pull requests
Successful merges:
- #94359 (Fix inconsistent symbol mangling of integers constants with -Zverbose)
- #94465 (6 - Make more use of `let_chains`)
- #94470 (⬆️ rust-analyzer)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Fix inconsistent symbol mangling of integers constants with -Zverbose
The `PrettyPrinter` changes formatting of array size and integer
constants based on `-Zverbose`, so its implementation cannot be used in
legacy symbol mangling.
Example symbol demangling before changes:
```console
$ cat a.rs
pub struct A<T>(T);
impl A<[u8; 128]> { pub fn f() {} }
$ rustc --crate-type=lib a.rs -Zverbose=n && nm -C ./liba.rlib
00000000 T a::A<[u8; 128]>::f
$ rustc --crate-type=lib a.rs -Zverbose=y && nm -C ./liba.rlib
00000000 T a::A<[u8; Const { ty. usize, val. Value(Scalar(0x0000000000000080)) }]>::f
```
Add `rustc_middle::ty::suggest_constraining_type_params` that suggests
adding multiple constraints.
`suggest_constraining_type_param` now just forwards params to this new
function.
