mirror of
https://github.com/saymrwulf/curve25519-dalek-source.git
synced 2026-09-04 20:24:10 +00:00
cb42e87096
build.rs was using cfg(target) but it has to evaluate this from env TARGET as build.rs cfg(target) in build context is the builder host and not the target. This change fixes curve25519_dalek_bits lottery to determine the correct automatic curve25119_dalek_bits with the help of platforms crate. As discussed in #456 this also prepares for well known defaults for wasm and arm serial backend via cfg(curve25519_dalek_bits = "64") If the wasm32 or armv7 are going to be u64 serial by default these will be followed up on later.
47 lines
1.7 KiB
Rust
47 lines
1.7 KiB
Rust
//! This selects the curve25519_dalek_bits either by default from target_pointer_width or explicitly set
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#[allow(non_camel_case_types)]
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enum DalekBits {
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#[cfg_attr(curve25519_dalek_bits = "64", allow(dead_code))]
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Dalek32,
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#[cfg_attr(curve25519_dalek_bits = "32", allow(dead_code))]
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Dalek64,
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}
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#[cfg(all(not(curve25519_dalek_bits = "64"), not(curve25519_dalek_bits = "32")))]
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#[deny(dead_code)]
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fn lotto_curve25519_dalek_bits() -> DalekBits {
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use platforms::target::PointerWidth;
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let target_triplet = std::env::var("TARGET").unwrap();
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let platform = platforms::Platform::find(&target_triplet).unwrap();
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match platform.target_arch {
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//Issues: 449 and 456
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//TODO(Arm): Needs tests + benchmarks to back this up
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//platforms::target::Arch::Arm => DalekBits::Dalek64,
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//TODO(Wasm32): Needs tests + benchmarks to back this up
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//platforms::target::Arch::Wasm32 => DalekBits::Dalek64,
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_ => match platform.target_pointer_width {
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PointerWidth::U64 => DalekBits::Dalek64,
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PointerWidth::U32 => DalekBits::Dalek32,
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_ => DalekBits::Dalek32,
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},
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}
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}
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fn main() {
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#[cfg(curve25519_dalek_bits = "32")]
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let curve25519_dalek_bits = DalekBits::Dalek32;
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#[cfg(curve25519_dalek_bits = "64")]
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let curve25519_dalek_bits = DalekBits::Dalek64;
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#[cfg(all(not(curve25519_dalek_bits = "64"), not(curve25519_dalek_bits = "32")))]
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let curve25519_dalek_bits = lotto_curve25519_dalek_bits();
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match curve25519_dalek_bits {
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DalekBits::Dalek64 => println!("cargo:rustc-cfg=curve25519_dalek_bits=\"64\""),
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DalekBits::Dalek32 => println!("cargo:rustc-cfg=curve25519_dalek_bits=\"32\""),
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}
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}
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