python-cryptography: patch pyo3 for cygwin support

and remove the MSYSTEM hack since maturin now works without it.

python-cryptography/0001-Explicitely-link-with-libpython-on-Cygwin.patch

@@ -0,0 +1,28 @@
+From be3b2f227a6cc60e27f2b74e9f301bcc136183e6 Mon Sep 17 00:00:00 2001
+From: Christoph Reiter <reiter.christoph@gmail.com>
+Date: Wed, 29 Oct 2025 08:26:50 +0100
+Subject: [PATCH 1/2] Explicitely link with libpython on Cygwin
+
+Like with Windows Python, under Cygwin we need to explicitely
+link with libpython.
+
+Thix fixes the build under Cygwin.
+---
+ pyo3-build-config/src/impl_.rs | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/pyo3-build-config/src/impl_.rs b/pyo3-build-config/src/impl_.rs
+index cca9393d..b977ac79 100644
+--- a/pyo3-build-config/src/impl_.rs
++++ b/pyo3-build-config/src/impl_.rs
+@@ -890,6 +890,7 @@ pub fn is_linking_libpython_for_target(target: &Triple) -> bool {
+         || target.operating_system == OperatingSystem::Aix
+         || target.environment == Environment::Android
+         || target.environment == Environment::Androideabi
++        || target.operating_system == OperatingSystem::Cygwin
+         || !is_extension_module()
+ }
+ 
+-- 
+2.51.2
+

python-cryptography/0002-Link-against-limited-API-DLL-under-Cygwin-when-abi3-.patch

@@ -0,0 +1,52 @@
+From 3fe4e71b229a0c9d01ab3df500b2ca4779e48ee5 Mon Sep 17 00:00:00 2001
+From: Christoph Reiter <reiter.christoph@gmail.com>
+Date: Wed, 29 Oct 2025 08:28:46 +0100
+Subject: [PATCH 2/2] Link against limited API DLL under Cygwin when abi3 is
+ used
+
+Like with Windows Python, we need to link to a different
+DLL which exports the limited API when using abi3.
+
+This makes pyo3 link against python3.dll instead of
+python3.XY.dll when abi3 is enabled.
+
+Note: The limited API DLL is currently not provided in
+cygwin upstream, but only in MSYS2 for now:
+https://github.com/msys2/MSYS2-packages/pull/5751
+---
+ pyo3-build-config/src/impl_.rs | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/pyo3-build-config/src/impl_.rs b/pyo3-build-config/src/impl_.rs
+index b977ac79..90a79e35 100644
+--- a/pyo3-build-config/src/impl_.rs
++++ b/pyo3-build-config/src/impl_.rs
+@@ -263,6 +263,7 @@ print_if_set("base_prefix", base_prefix)
+ print("executable", sys.executable)
+ print("calcsize_pointer", struct.calcsize("P"))
+ print("mingw", get_platform().startswith("mingw"))
++print("cygwin", get_platform().startswith("cygwin"))
+ print("ext_suffix", get_config_var("EXT_SUFFIX"))
+ print("gil_disabled", get_config_var("Py_GIL_DISABLED"))
+ "#;
+@@ -315,6 +316,8 @@ print("gil_disabled", get_config_var("Py_GIL_DISABLED"))
+             _ => panic!("Unknown Py_GIL_DISABLED value"),
+         };
+ 
++        let cygwin = map["cygwin"].as_str() == "True";
++
+         let lib_name = if cfg!(windows) {
+             default_lib_name_windows(
+                 version,
+@@ -327,6 +330,8 @@ print("gil_disabled", get_config_var("Py_GIL_DISABLED"))
+                 map["ext_suffix"].starts_with("_d."),
+                 gil_disabled,
+             )?
++        } else if cygwin && abi3 {
++            "python3".to_string()
+         } else {
+             default_lib_name_unix(
+                 version,
+-- 
+2.51.2
+

python-cryptography/PKGBUILD

@@ -22,18 +22,32 @@ makedepends=(
   'openssl-devel'
   'pkgconf'
 )
-source=("https://pypi.org/packages/source/${_realname::1}/${_realname}/${_realname}-${pkgver}.tar.gz")
-sha256sums=('a8b17438104fed022ce745b362294d9ce35b4c2e45c1d958ad4a4b019285f4a1')
+source=("https://pypi.org/packages/source/${_realname::1}/${_realname}/${_realname}-${pkgver}.tar.gz"
+        "https://github.com/PyO3/pyo3/archive/refs/tags/v0.26.0.tar.gz"
+        "0001-Explicitely-link-with-libpython-on-Cygwin.patch"
+        "0002-Link-against-limited-API-DLL-under-Cygwin-when-abi3-.patch")
+sha256sums=('a8b17438104fed022ce745b362294d9ce35b4c2e45c1d958ad4a4b019285f4a1'
+            '8b6ed2db5038ad30cd6e408bbfa514182e9ae30c50aa34c3184a4e98df1603cf'
+            '2c2eddb7793eed07bdc389be4e853b63897475f93cc59e64b298c73919ff6337'
+            '177e197e4f54c1300d5bf29472080c0c3e2c13f5501968ae8678b83b32750485')
+
+prepare() {
+  cd "pyo3-0.26.0"
+  patch -p1 -i ../0001-Explicitely-link-with-libpython-on-Cygwin.patch
+  patch -p1 -i ../0002-Link-against-limited-API-DLL-under-Cygwin-when-abi3-.patch
+
+  cd "${srcdir}/${_realname}-${pkgver}"
+cat >> Cargo.toml <<END
+
+[patch.crates-io]
+pyo3-build-config = { path = "../pyo3-0.26.0/pyo3-build-config" }
+END
+  cargo update -p pyo3-build-config
+}
 
 build() {
   cd "${_realname}-${pkgver}"
 
-  # XXX: to fix maturin OS detection
-  export MSYSTEM=CYGWIN
-
-  # XXX: this should be handled by maturin/pyo3 somehow
-  export RUSTFLAGS="-C link-arg=-lpython3"
-
   python -m build --wheel --no-isolation
 }