bschoenmaeckers · Oct 21, 2026 · Oct 21, 2026 · Oct 21, 2026 · Oct 22, 2026 · Oct 28, 2026
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
@@ -588,7 +588,7 @@ jobs:
 
       # Keep features in sync with update-caches.yml CARGO_ARGS.
       - name: build rustpython
-        run: cargo build --locked --release --verbose --features=threading,jit ${{ env.CARGO_ARGS }}
+        run: cargo build --locked --release --verbose --features=threading,jit,capi ${{ env.CARGO_ARGS }}
 
       - name: run snippets
         run: python -m pip install -r requirements.txt && pytest -v

diff --git a/.github/workflows/update-caches.yml b/.github/workflows/update-caches.yml
@@ -20,7 +20,7 @@ env:
   CARGO_PROFILE_DEV_DEBUG: 0
   CARGO_PROFILE_RELEASE_DEBUG: 0
   # Keep feature list in sync with CI's release build in .github/workflows/ci.yaml.
-  CARGO_ARGS: --workspace --no-default-features --features stdlib,importlib,stdio,encodings,sqlite,ssl-rustls-aws-lc,host_env,threading,jit,doc --exclude rustpython_wasm --exclude rustpython-venvlauncher
+  CARGO_ARGS: --workspace --no-default-features --features stdlib,importlib,stdio,encodings,sqlite,ssl-rustls-aws-lc,host_env,threading,jit,doc,capi --exclude rustpython_wasm --exclude rustpython-venvlauncher
 
 jobs:
   build-caches:

diff --git a/Lib/test/test_ctypes/test_python_api.py b/Lib/test/test_ctypes/test_python_api.py
@@ -7,7 +7,6 @@
 
 
 class PythonAPITestCase(unittest.TestCase):
-    @unittest.expectedFailure  # TODO: RUSTPYTHON; - requires pythonapi (Python C API)
     def test_PyBytes_FromStringAndSize(self):
         PyBytes_FromStringAndSize = pythonapi.PyBytes_FromStringAndSize
 
@@ -58,7 +57,6 @@ def test_PyObj_FromPtr(self):
         del pyobj
         self.assertEqual(sys.getrefcount(s), ref)
 
-    @unittest.expectedFailure  # TODO: RUSTPYTHON; - requires pythonapi (Python C API)
     def test_PyOS_snprintf(self):
         PyOS_snprintf = pythonapi.PyOS_snprintf
         PyOS_snprintf.argtypes = POINTER(c_char), c_size_t, c_char_p

diff --git a/Lib/test/test_frame.py b/Lib/test/test_frame.py
@@ -678,7 +678,6 @@ def test_eq(self):
 
 
 class TestFrameCApi(unittest.TestCase):
-    @unittest.expectedFailure  # TODO: RUSTPYTHON
     def test_basic(self):
         x = 1
         ctypes = import_helper.import_module('ctypes')

diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
@@ -476,7 +476,6 @@ def fail_new_thread(*args, **kwargs):
         finally:
             threading._start_joinable_thread = _start_joinable_thread
 
-    @unittest.expectedFailure  # TODO: RUSTPYTHON; ctypes.pythonapi is not supported
     def test_finalize_running_thread(self):
         # Issue 1402: the PyGILState_Ensure / _Release functions may be called
         # very late on python exit: on deallocation of a running thread for

diff --git a/build.rs b/build.rs
@@ -10,6 +10,10 @@ fn main() {
             println!("cargo:rustc-link-arg-bin=rustpython=-Wl,-export_dynamic");
         }
         "windows" => {
+            if capi_enabled {
+                export_capi_symbols_for_windows_exe();
+            }
+
             println!("cargo:rerun-if-changed=logo.ico");
             let mut res = winresource::WindowsResource::new();
             if std::path::Path::new("logo.ico").exists() {
@@ -27,3 +31,21 @@ fn main() {
         _ => {}
     }
 }
+
+fn export_capi_symbols_for_windows_exe() {
+    let exports_def_filename = "rustpython-capi-exports.def";
+    println!("cargo:rerun-if-changed={exports_def_filename}");
+
+    let exports = std::fs::read_to_string(exports_def_filename)
+        .expect("Failed to read exports definition file");
+
+    for export in exports
+        .lines()
+        .skip(1)
+        .filter(|line| !line.trim().is_empty())
+    {
+        println!("cargo:rustc-link-arg-bin=rustpython=/INCLUDE:{export}");
+    }
+
+    println!("cargo:rustc-link-arg-bin=rustpython=/DEF:{exports_def_filename}",);
+}