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Add custom-fallback crate feature #725

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Add custom-fallback crate feature #725

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4 changes: 4 additions & 0 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,10 @@ exclude = [".*"]
# use std to retrieve OS error descriptions
std = []

# Use the custom backend on unsupported targets
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@dhardy dhardy Sep 22, 2025 •
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Should say:

# Use the custom backend when getrandom_backend cfg is not set

# WARNING: this feature SHOULD be enabled only by fallback implementation crates!
custom-fallback = []

# Optional backend: wasm_js
# This flag enables the backend but does not select it. To use the backend, use
# this flag *and* set getrandom_backend=wasm_js (see README).
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3 changes: 3 additions & 0 deletions src/backends.rs
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Expand Up @@ -182,6 +182,9 @@ cfg_if! {
} else if #[cfg(all(target_arch = "x86_64", target_env = "sgx"))] {
mod rdrand;
pub use rdrand::*;
} else if #[cfg(feature = "custom-fallback")] {
mod custom;
pub use custom::*;
} else if #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))] {
compile_error!(concat!(
"The wasm32-unknown-unknown targets are not supported by default; \
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