std: deduplicate errno accesses#139081
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By marking `__errno_location` as `#[ffi_const]` and `std::sys::os::errno` as `#[inline]`, this PR allows merging multiple calls to `io::Error::last_os_error()` into one.
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r? @Noratrieb rustbot has assigned @Noratrieb. Use |
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https://github.com/bminor/glibc/blob/b0897944cc3081e019b39981790051f7ee127406/stdlib/errno.h#L37 in glibc, the function is indeed declared const, so this should be correct. |
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Note that e.g. Apple's
So a libc that changes the address of |
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std: deduplicate `errno` accesses By marking `__errno_location` as `#[ffi_const]` and `std::sys::os::errno` as `#[inline]`, this PR allows merging multiple calls to `io::Error::last_os_error()` into one.
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#137928 (stabilize const_cell) - rust-lang#138431 (Fix `uclibc` LLVM target triples) - rust-lang#138832 (Start using `with_native_path` in `std::sys::fs`) - rust-lang#139060 (replace commit placeholder in vendor status with actual commit) - rust-lang#139081 (std: deduplicate `errno` accesses) - rust-lang#139100 (compiletest: Support matching diagnostics on lines below) - rust-lang#139105 (`BackendRepr::is_signed`: comment why this may panics) - rust-lang#139106 (Mark .pp files as Rust) r? `@ghost` `@rustbot` modify labels: rollup
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…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#137928 (stabilize const_cell) - rust-lang#138431 (Fix `uclibc` LLVM target triples) - rust-lang#138832 (Start using `with_native_path` in `std::sys::fs`) - rust-lang#139081 (std: deduplicate `errno` accesses) - rust-lang#139100 (compiletest: Support matching diagnostics on lines below) - rust-lang#139105 (`BackendRepr::is_signed`: comment why this may panics) - rust-lang#139106 (Mark .pp files as Rust) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#139081 - joboet:errno_dedup, r=Noratrieb std: deduplicate `errno` accesses By marking `__errno_location` as `#[ffi_const]` and `std::sys::os::errno` as `#[inline]`, this PR allows merging multiple calls to `io::Error::last_os_error()` into one.
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std: deduplicate `errno` accesses By marking `__errno_location` as `#[ffi_const]` and `std::sys::os::errno` as `#[inline]`, this PR allows merging multiple calls to `io::Error::last_os_error()` into one.
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…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#137928 (stabilize const_cell) - rust-lang#138431 (Fix `uclibc` LLVM target triples) - rust-lang#138832 (Start using `with_native_path` in `std::sys::fs`) - rust-lang#139081 (std: deduplicate `errno` accesses) - rust-lang#139100 (compiletest: Support matching diagnostics on lines below) - rust-lang#139105 (`BackendRepr::is_signed`: comment why this may panics) - rust-lang#139106 (Mark .pp files as Rust) r? `@ghost` `@rustbot` modify labels: rollup
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By marking
__errno_locationas#[ffi_const]andstd::sys::os::errnoas#[inline], this PR allows merging multiple calls toio::Error::last_os_error()into one.