rust/library/std/src/sys/env, branch master

library: Migrate from `cfg_if` to `cfg_select`

2025-08-16T12:28:31+00:00

Migrate the standard library from using the external `cfg_if` crate to using the now-built-in `cfg_select` macro. This does not yet eliminate the dependency from `library/std/Cargo.toml`, because while the standard library itself no longer uses `cfg_if`, it also incorporates the `backtrace` crate, which does. Migration assisted by the following vim command (after selecting the full `cfg_if!` invocation): ``` '<,'>s/\(cfg_if::\)\?cfg_if/cfg_select/ | '<,'>s/^\( *\)} else {/\1}\r\1_ => {/c | '<,'>s/^\( *\)} else if #\[cfg(\(.*\))\] /\1}\r\1\2 => /e | '<,'>s/if #\[cfg(\(.*\))\] {/\1 => {/e ``` This is imperfect, but substantially accelerated the process. This prompts for confirmation on the `} else {` since that can also appear inside one of the arms. This also requires manual intervention to handle any multi-line conditions.

use generic Atomic type where possible

2025-04-26T23:18:08+00:00

in core/alloc/std only for now, and ignoring test files Co-authored-by: Pavel Grigorenko

Unify owned `Env` types between platforms

2025-04-22T05:38:22+00:00

Also, update the same pattern of reuse in `sys::args` to match.

Deduplicate unsupported env items

2025-04-22T04:58:58+00:00

Fix `unsafe_op_in_unsafe_fn` for Unix env

2025-04-22T04:17:16+00:00

Move `sys::pal::os::Env` into `sys::env`

2025-04-22T03:56:43+00:00

Although `Env` (as `Vars`), `Args`, path functions, and OS constants are publicly exposed via `std::env`, their implementations are each self-contained. Keep them separate in `std::sys` and make a new module, `sys::env`, for `Env`.