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Add `read_buf` equivalents for positioned reads
Adds the following items under the ~~`read_buf` (rust-lang/rust#78485)~~ `read_buf_at` (rust-lang/rust#140771) feature:
- `std::os::unix::fs::FileExt::read_buf_at`
- `std::os::unix::fs::FileExt::read_buf_exact_at`
- `std::os::windows::fs::FileExt::seek_read_buf`
try-job: `x86_64-msvc*`
try-job: `test-various*`
try-job: `dist-various*`
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Adds the following items under the `read_buf_at` feature:
- `std::os::unix::fs::FileExt::read_buf_at`
- `std::os::unix::fs::FileExt::read_buf_exact_at`
- `std::os::windows::fs::FileExt::seek_read_buf`
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Darwin's `read`/`write` syscalls emit `EINVAL` only when `nbyte > INT_MAX`.
The case `nbyte == INT_MAX` is valid, so the subtraction can be removed.
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cfi: Remove #[no_sanitize(cfi)] for extern weak functions
Previously (https://github.com/rust-lang/rust/pull/115200, https://github.com/rust-lang/rust/pull/138002), we added `#[no_sanitize(cfi)]` to all code paths that call to a weakly linked function.
In https://github.com/rust-lang/rust/pull/138349 we fixed the root cause for this issue, which means we can now remove the corresponding attributes.
r? `@rcvalle`
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Previously (https://github.com/rust-lang/rust/pull/115200,
https://github.com/rust-lang/rust/pull/138002), we
added `#[no_sanitize(cfi)]` to all code paths that call to a weakly
linked function.
In https://github.com/rust-lang/rust/pull/138349 we fixed the root cause
for this issue, which means we can now remove the corresponding
attributes.
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Fix std build for all NuttX targets. It is the single largest set of
failures on <https://does-it-build.noratrieb.dev/>. Although, ESP-IDF
also requires these same gates, there are other issues for those
targets.
This can verified be running `x check library/std --target=` for all
NuttX targets.
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