posix_spawn is not supported on Android
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Description
Current posix_spawn implementation is available for Linux target_os but not Android:
https://github.com/rust-lang/rust/blob/main/library/std/src/sys/process/unix/unix.rs#L421-L436
Also, I don't quite understand why Android is considered as a completely different OS than Linux. This is making conditional compilation harder to support Android properly. It could have been just a different target_env like it is currently done with gnu and musl. Is there a specific reason to use a separate target_os?
Meta
rustc --version --verbose:
rustc 1.91.1 (ed61e7d7e 2025-11-07)
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Research direction
Start with library/std/src/sys/process/unix/unix.rs around lines 421-436 and compare the existing Linux and Android target conditionals. Determine what Android needs for posix_spawn support and clarify whether the target_os distinction affects this path; done means Android builds can use the supported implementation with appropriate coverage.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100