TST: extend local lib test to verify Windows support

Author: dnicolodi

tests/packages/link-against-local-lib/__init__.py

@@ -0,0 +1,20 @@
+# SPDX-FileCopyrightText: 2025 The meson-python developers
+#
+# SPDX-License-Identifier: MIT
+
+import os
+import sys
+
+
+_path = os.path.join(os.path.dirname(__file__), '..', '.link_against_local_lib.mesonpy.libs')
+if os.name == 'nt':
+    os.add_dll_directory(_path)
+elif sys.platform == 'cygwin':
+    os.environ['PATH'] = os.pathsep.join((os.environ['PATH'], _path))
+del _path
+
+
+from ._example import example_sum  # noqa: E402
+
+
+__all__ = ['example_sum']

tests/packages/link-against-local-lib/examplemod.c

@@ -25,13 +25,13 @@ static PyMethodDef methods[] = {
 
 static struct PyModuleDef module = {
     PyModuleDef_HEAD_INIT,
-    "example",
+    "_example",
     NULL,
     -1,
     methods,
 };
 
-PyMODINIT_FUNC PyInit_example(void)
+PyMODINIT_FUNC PyInit__example(void)
 {
     return PyModule_Create(&module);
 }

tests/packages/link-against-local-lib/lib/examplelib.c

@@ -2,6 +2,8 @@
 //
 // SPDX-License-Identifier: MIT
 
+#include "examplelib.h"
+
 int sum(int a, int b) {
 	return a + b;
 }

tests/packages/link-against-local-lib/lib/examplelib.h

@@ -2,4 +2,15 @@
 //
 // SPDX-License-Identifier: MIT
 
-int sum(int a, int b);
+#pragma once
+
+#if defined(EXAMPLE_DLL_EXPORTS)
+    #define EXAMPLE_DLL __declspec(dllexport)
+#elif defined(BAR_DLL_IMPORTS)
+    #define EXAMPLE_DLL __declspec(dllimport)
+#else
+    #define EXAMPLE_DLL
+#endif
+
+
+EXAMPLE_DLL int sum(int a, int b);

tests/packages/link-against-local-lib/lib/meson.build

@@ -5,5 +5,6 @@
 example_lib = shared_library(
     'example',
     'examplelib.c',
+    c_args: lib_compile_args,
     install: true,
 )

tests/packages/link-against-local-lib/meson.build

@@ -4,14 +4,28 @@
 
 project('link-against-local-lib', 'c', version: '1.0.0')
 
+if meson.get_compiler('c').get_id() in ['msvc', 'clang-cl', 'intel-cl']
+    lib_compile_args = ['-DEXAMPLE_DLL_EXPORTS']
+    link_args = ['-DEXAMPLE_DLL_IMPORTS']
+else
+    lib_compile_args = []
+    link_args = ['-Wl,-rpath,custom-rpath']
+endif
+
 subdir('lib')
 
-py = import('python').find_installation()
+py = import('python').find_installation(pure: false)
+
+py.install_sources(
+    '__init__.py',
+    subdir: 'example',
+)
 
 py.extension_module(
-    'example',
+    '_example',
     'examplemod.c',
     link_with: example_lib,
-    link_args: ['-Wl,-rpath,custom-rpath'],
+    link_args: link_args,
     install: true,
+    subdir: 'example',
 )

tests/packages/link-against-local-lib/pyproject.toml

@@ -5,3 +5,6 @@
 [build-system]
 build-backend = 'mesonpy'
 requires = ['meson-python']
+
+[tool.meson-python]
+allow-windows-internal-shared-libs = true

tests/test_wheel.py

@@ -172,7 +172,6 @@ def test_contents(package_library, wheel_library):
     }
 
 
-@pytest.mark.skipif(sys.platform not in {'linux', 'darwin', 'sunos5'}, reason='Not supported on this platform')
 def test_local_lib(venv, wheel_link_against_local_lib):
     venv.pip('install', wheel_link_against_local_lib)
     output = venv.python('-c', 'import example; print(example.example_sum(1, 2))')
@@ -200,9 +199,9 @@ def test_rpath(wheel_link_against_local_lib, tmp_path):
     artifact.extractall(tmp_path)
 
     origin = {'linux': '$ORIGIN', 'darwin': '@loader_path', 'sunos5': '$ORIGIN'}[sys.platform]
-    expected = {f'{origin}/.link_against_local_lib.mesonpy.libs', 'custom-rpath',}
+    expected = {f'{origin}/../.link_against_local_lib.mesonpy.libs', 'custom-rpath',}
 
-    rpath = set(mesonpy._rpath._get_rpath(tmp_path / f'example{EXT_SUFFIX}'))
+    rpath = set(mesonpy._rpath._get_rpath(tmp_path / 'example' / f'_example{EXT_SUFFIX}'))
     # Verify that rpath is a superset of the expected one: linking to
     # the Python runtime may require additional rpath entries.
     assert rpath >= expected