maturin: more cygwin fixes

Partly inspired from https://github.com/PyO3/maturin/pull/2765

maturin/0002-cygwin-support.patch

@@ -0,0 +1,92 @@
+--- maturin-1.9.6/src/target/mod.rs.orig	2025-10-07 14:34:28.000000000 +0200
++++ maturin-1.9.6/src/target/mod.rs	2025-10-27 18:39:27.311185000 +0100
+@@ -43,6 +43,7 @@
+     Wasi,
+     Aix,
+     Hurd,
++    Cygwin,
+ }
+ 
+ impl fmt::Display for Os {
+@@ -63,6 +64,7 @@
+             Os::Wasi => write!(f, "Wasi"),
+             Os::Aix => write!(f, "AIX"),
+             Os::Hurd => write!(f, "Hurd"),
++            Os::Cygwin => write!(f, "Cygwin"),
+         }
+     }
+ }
+@@ -209,6 +211,7 @@
+         Os::Emscripten | Os::Wasi => vec![Arch::Wasm32],
+         Os::Aix => vec![Arch::Powerpc64],
+         Os::Hurd => vec![Arch::X86, Arch::X86_64],
++        Os::Cygwin => vec![Arch::X86, Arch::X86_64],
+     }
+ }
+ 
+@@ -283,6 +286,7 @@
+             OperatingSystem::Wasi | OperatingSystem::WasiP1 | OperatingSystem::WasiP2 => Os::Wasi,
+             OperatingSystem::Aix => Os::Aix,
+             OperatingSystem::Hurd => Os::Hurd,
++            OperatingSystem::Cygwin => Os::Cygwin,
+             unsupported => bail!("The operating system {:?} is not supported", unsupported),
+         };
+ 
+@@ -463,6 +467,7 @@
+             Os::Wasi => "wasi",
+             Os::Aix => "aix",
+             Os::Hurd => "gnu",
++            Os::Cygwin => "cygwin",
+         }
+     }
+ 
+@@ -558,7 +563,8 @@
+             | Os::Emscripten
+             | Os::Wasi
+             | Os::Aix
+-            | Os::Hurd => true,
++            | Os::Hurd
++            | Os::Cygwin => true,
+         }
+     }
+ 
+--- maturin-1.9.6/src/python_interpreter/mod.rs.orig	2025-10-07 14:34:28.000000000 +0200
++++ maturin-1.9.6/src/python_interpreter/mod.rs	2025-10-27 18:57:13.775589900 +0100
+@@ -292,6 +292,7 @@
+     if bridge != &BridgeModel::Cffi
+         && target.get_python_os() != message.system
+         && !target.cross_compiling()
++        && (target.get_python_os() == "cygwin" && !message.system.to_lowercase().starts_with("cygwin"))
+     {
+         bail!(
+             "platform.system() in python, {}, and the rust target, {:?}, don't match ಠ_ಠ",
+--- maturin-1.9.6/src/target/mod.rs.orig	2025-10-07 14:34:28.000000000 +0200
++++ maturin-1.9.6/src/target/mod.rs	2025-10-27 20:03:22.265265400 +0100
+@@ -610,6 +610,12 @@
+         self.env == Environment::Msvc
+     }
+ 
++    /// Returns true if the current platform is cygwin
++    #[inline]
++    pub fn is_cygwin(&self) -> bool {
++        self.os == Os::Cygwin
++    }
++
+     /// Returns true if the current platform is illumos
+     #[inline]
+     pub fn is_illumos(&self) -> bool {
+--- maturin-1.9.6/src/module_writer.rs.orig	2025-10-07 14:34:28.000000000 +0200
++++ maturin-1.9.6/src/module_writer.rs	2025-10-27 20:04:48.501685200 +0100
+@@ -855,7 +855,11 @@
+     let ext_name = &project_layout.extension_name;
+     let so_filename = if is_abi3 {
+         if target.is_unix() {
+-            format!("{ext_name}.abi3.so")
++            if target.is_cygwin() {
++                format!("{ext_name}.abi3.dll")
++            } else {
++                format!("{ext_name}.abi3.so")
++            }
+         } else {
+             match python_interpreter {
+                 Some(python_interpreter) if python_interpreter.is_windows_debug() => {

maturin/PKGBUILD

@@ -3,7 +3,7 @@
 pkgbase=maturin
 pkgname=("python-maturin" "maturin")
 pkgver=1.9.6
-pkgrel=2
+pkgrel=3
 pkgdesc='Build and publish crates with pyo3, rust-cpython and cffi bindings'
 arch=('x86_64')
 url='https://www.maturin.rs/'
@@ -25,17 +25,21 @@ source=("https://pypi.org/packages/source/${pkgbase::1}/${pkgbase}/${pkgbase}-${
         "getrandom-0.2.15.tar.gz::https://crates.io/api/v1/crates/getrandom/0.2.15/download"
         "maturin-update-deps.patch"
         "tar-rs-update-deps.patch"
-        "getrandom-support-cygwin.patch")
+        "getrandom-support-cygwin.patch"
+        "0002-cygwin-support.patch")
 sha256sums=('2c2ae37144811d365509889ed7220b0598487f1278c2441829c3abf56cc6324a'
             'c65998313f8e17d0d553d28f91a0df93e4dbbbf770279c7bc21ca0f09ea1a1f6'
             'c4567c8db10ae91089c99af84c68c38da3ec2f087c3f82960bcdbf3656b6f4d7'
             '36bb5955216d19aed9a8fb2ec9440e7e3133de2e7d5ed1da2ad2204d449a2095'
             '2422ed08564445528695499757258aecde785bb6e95cde2d88f4b2cefe8417d8'
-            'acac76aa379bc45285f067524d7c5adceb3100698d72ae150a6b626a137e947d')
+            'acac76aa379bc45285f067524d7c5adceb3100698d72ae150a6b626a137e947d'
+            '8290bd5ee62abad58428932a739b899afa7472a959aa6629d4a54a2bf7bf59c8')
 
 prepare() {
   cp -r "${pkgbase}-${pkgver}" "python-build" && cd "python-build"
 
+  patch -Np1 -i ../0002-cygwin-support.patch
+
   # support cygwin in some deps
   patch -d ../getrandom-0.2.15 -p1 -i ../getrandom-support-cygwin.patch
   # update deps to add cygwin support