feat: add cygwin support

.github/workflows/libloading.yml

@@ -65,6 +65,26 @@ jobs:
  env:
  TARGET: ${{ matrix.rust_target}}
 
+ msys2-test:
+ runs-on: windows-latest
+ strategy:
+ fail-fast: false
+ steps:
+ - uses: actions/checkout@v2
+ - run: rustup install nightly --profile=minimal
+ - run: rustup default nightly
+ - run: rustup component add rust-src
+ - uses: msys2/setup-msys2@v2
+ with:
+ release: false
+ install: gcc
+ - run: echo "INPUT(libmsys-2.0.a)" | Out-File -FilePath "C:\msys64\usr\lib\libcygwin.a"
+ - run: |
+ $env:PATH = "C:\msys64\usr\bin\;$env:PATH"
+ cargo test --target x86_64-pc-cygwin -Zbuild-std
+ env:
+ CARGO_TARGET_X86_64_PC_CYGWIN_LINKER: x86_64-pc-msys-gcc.exe
+
  bare-cross-build:
  runs-on: ubuntu-latest
  strategy:

Cargo.toml

@@ -34,4 +34,7 @@ all-features = true
 rustdoc-args = ["--cfg", "libloading_docs"]
 
 [lints.rust]
-unexpected_cfgs = { level = "warn", check-cfg = ['cfg(libloading_docs)'] }
+unexpected_cfgs = { level = "warn", check-cfg = [
+ 'cfg(libloading_docs)',
+ 'cfg(target_os, values("cygwin"))',
+] }

src/os/unix/consts.rs

@@ -88,6 +88,7 @@ mod posix {
  target_os = "redox",
  target_os = "nto",
  target_os = "hurd",
+ target_os = "cygwin",
  ))] {
  pub(super) const RTLD_LAZY: c_int = 1;
  } else {
@@ -127,6 +128,7 @@ mod posix {
  target_os = "redox",
  target_os = "nto",
  target_os = "hurd",
+ target_os = "cygwin",
  ))] {
  pub(super) const RTLD_NOW: c_int = 2;
  } else if #[cfg(all(target_os = "android",target_pointer_width = "32"))] {
@@ -150,6 +152,7 @@ mod posix {
  target_env = "uclibc",
  all(target_os = "linux", target_arch = "mips"),
  all(target_os = "linux", target_arch = "mips64"),
+ target_os = "cygwin",
  ))] {
  pub(super) const RTLD_GLOBAL: c_int = 4;
  } else if #[cfg(any(
@@ -224,6 +227,7 @@ mod posix {
  target_os = "fuchsia",
  target_os = "redox",
  target_os = "hurd",
+ target_os = "cygwin",
  ))] {
  pub(super) const RTLD_LOCAL: c_int = 0;
  } else {

src/os/unix/mod.rs

@@ -278,7 +278,8 @@ impl Library {
  target_os = "solaris",
  target_os = "illumos",
  target_os = "redox",
- target_os = "fuchsia"
+ target_os = "fuchsia",
+ target_os = "cygwin",
  ))] {
  self.get_singlethreaded(symbol)
  } else {

tests/functions.rs

@@ -191,6 +191,8 @@ fn test_static_ptr() {
 // the target. Especially since it is very unlikely to be fixed given the state of support its
 // support.
 #[cfg(not(all(target_arch = "x86", target_os = "windows", target_env = "gnu")))]
+// Cygwin returns errors on `close`.
+#[cfg(not(target_os = "cygwin"))]
 fn manual_close_many_times() {
  make_helpers();
  let join_handles: Vec<_> = (0..16)
@@ -224,6 +226,8 @@ fn library_this_get() {
  .get::<unsafe extern "C" fn()>(b"test_identity_u32")
  .is_err());
  // Something obscure from libc...
+ // Cygwin behaves like Windows so ignore it.
+ #[cfg(not(target_os = "cygwin"))]
  assert!(this.get::<unsafe extern "C" fn()>(b"freopen").is_ok());
  }
 }

tests/library_filename.rs

@@ -2,7 +2,7 @@ extern crate libloading;
 use libloading::library_filename;
 use std::path::Path;
 
-#[cfg(target_os = "windows")]
+#[cfg(any(target_os = "windows", target_os = "cygwin"))]
 const EXPECTED: &str = "audioengine.dll";
 #[cfg(target_os = "linux")]
 const EXPECTED: &str = "libaudioengine.so";