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Add support for Cygwin #2730

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Merged
briansmith merged 3 commits into from
Mar 23, 2026
+6 −4
Merged

Add support for Cygwin #2730

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eadde91
Enable `getrandom` support for Cygwin
500-internal-server-error Mar 16, 2026
db72863
Fix building asm for Cygwin
500-internal-server-error Mar 18, 2026
fc857a7
Bypass building `.S` files for Cygwin
500-internal-server-error Mar 18, 2026
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5 changes: 3 additions & 2 deletions build/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -187,7 +187,7 @@ const ASM_TARGETS: &[AsmTarget] = &[
perlasm_format: WIN32N,
},
AsmTarget {
oss: &[WINDOWS],
oss: &[WINDOWS, CYGWIN],
arch: X86_64,
perlasm_format: NASM,
},
Expand Down Expand Up @@ -253,6 +253,7 @@ const NASM: &str = "nasm";
const APPLE_ABI: &[&str] = &["ios", "macos", "tvos", "visionos", "watchos"];

const WINDOWS: &str = "windows";
const CYGWIN: &str = "cygwin";

pub fn generate_sources_and_preassemble<'a>(
tools: &Tools,
Expand Down Expand Up @@ -344,7 +345,7 @@ pub fn build_c_code(
// them.
if extension == "S"
&& (target.arch == X86_64 || target.arch == X86)
&& target.os == WINDOWS
&& (target.os == WINDOWS || target.os == CYGWIN)
{
return false;
}
Expand Down
2 changes: 1 addition & 1 deletion src/ec/curve25519/ops.rs
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Expand Up @@ -71,7 +71,7 @@ pub struct P3 {
impl P3 {
// Returns the result of multiplying the base point by the scalar in constant time.
pub(super) fn from_scalarmult_base(scalar: &Scalar, cpu: cpu::Features) -> Self {
#[cfg(all(target_arch = "x86_64", not(windows)))]
#[cfg(all(target_arch = "x86_64", not(windows), not(target_os = "cygwin")))]
if let Some(cpu) = super::adx::get_features(cpu) {
return super::adx::scalarmult_base(scalar, cpu);
}
Expand Down
2 changes: 1 addition & 1 deletion src/ec/curve25519/x25519.rs
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Expand Up @@ -119,7 +119,7 @@ fn x25519_ecdh(
return x25519_neon(out, scalar, point, cpu);
}

#[cfg(all(target_arch = "x86_64", not(windows)))]
#[cfg(all(target_arch = "x86_64", not(windows), not(target_os = "cygwin")))]
if super::adx::get_features(cpu).is_some() {
prefixed_extern! {
unsafe fn x25519_scalar_mult_adx(
Expand Down
1 change: 1 addition & 0 deletions src/rand.rs
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Expand Up @@ -128,6 +128,7 @@ impl SystemRandom {
all(feature = "less-safe-getrandom-espidf", target_os = "espidf"),
target_os = "aix",
target_os = "android",
target_os = "cygwin",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "fuchsia",
Expand Down
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