Use getrandom syscall on riscv32/riscv64 linux #699
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Minimum kernel needed on RISCV is fairly new (4.15+) so we are sure to have getrandom syscall, on glibc there is mimimal ABI kernel to denote it but musl does not have any other way to indicate it, so add it as a condition here to choose getrandom backend for rv32/rv64 on linux when using musl. Signed-off-by: Khem Raj <[email protected]>
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Looks reasonable to me!
I think we should probably go through and clean up that large case statement, to more systematically consider particular libc being used, but that shouldn't block this PR.
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## [0.3.4] - 2025-10-14 ### Major change to `wasm_js` backend Now, when the `wasm_js` feature is enabled, the `wasm_js` backend will be used by default. Users of `wasm32-unknown-unknown` targeting JavaScript environments like the Web and Node.js will no longer need to specify: ``` --cfg getrandom_backend="wasm_js" ``` in `RUSTFLAGS` for the crate to compile. They can now simple enable a feature. Note: this should not affect non-JS users of the `wasm32-unknown-unknown` target. Using `--cfg getrandom_backend` will still override the source of randomness _even if_ the `wasm_js` feature is enabled. This includes `--cfg getrandom_backend=custom` and `--cfg getrandom_backend=unsupported`. For more information, see the discussions in [#671], [#675], and [#730]. ### Added - `unsupported` opt-in backend [#667] - `windows_legacy` opt-in backend [#724] ### Changed - Implement Memory Sanitizer unpoisoning more precisely [#678] - Relax MSRV for the `linux_raw` opt-in backend on ARM targets [#688] - Use `getrandom` syscall on all RISC-V Linux targets [#699] - Replaced `wasi` dependency with `wasip2` [#721] - Enable `wasm_js` backend by default if the `wasm_js` feature is enabled [#730] ### Removed - Unstable `rustc-dep-of-std` crate feature [#694] [#667]: #667 [#671]: #671 [#675]: #675 [#678]: #678 [#688]: #688 [#694]: #694 [#699]: #699 [#721]: #721 [#724]: #724 [#730]: #730 --------- Signed-off-by: Joe Richey <[email protected]>
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Minimum kernel needed on RISCV is fairly new (4.15+) so we are sure to have getrandom syscall, on glibc there is mimimal ABI kernel to denote it but musl does not have any other way to indicate it, so add it as a condition here to choose getrandom backend for rv32/rv64 on linux when using musl.