feat: allow-empty and simpler testing

cibuildwheel/__main__.py

@@ -95,6 +95,9 @@ def main() -> None:
     parser.add_argument('--print-build-identifiers',
                         action='store_true',
                         help='Print the build identifiers matched by the current invocation and exit.')
+    parser.add_argument('--allow-empty',
+                        action='store_true',
+                        help='Do not report an error code if the build does not match any wheels.')
 
     args = parser.parse_args()
 
@@ -267,8 +270,9 @@ def main() -> None:
         assert_never(platform)
 
     if not identifiers:
-        print("ERROR: No build identifiers selected!")
-        sys.exit(3)
+        print(f'cibuildwheel: No build identifiers selected: {build_selector}', file=sys.stderr)
+        if not args.allow_empty:
+            sys.exit(3)
 
 
 def detect_obsolete_options() -> None:

pyproject.toml

@@ -5,9 +5,3 @@ requires = [
 ]
 
 build-backend = "setuptools.build_meta"
-
-
-[tool.pytest.ini_options]
-markers = [
-    "allow_empty(platform): Allow main tests on this platform(s) to be empty",
-]

unit_test/main_tests/conftest.py

@@ -52,8 +52,15 @@ def fake_package_dir(monkeypatch):
         else:
             return real_path_exists(path)
 
+    args = ['cibuildwheel', str(MOCK_PACKAGE_DIR)]
     monkeypatch.setattr(Path, 'exists', mock_path_exists)
-    monkeypatch.setattr(sys, 'argv', ['cibuildwheel', str(MOCK_PACKAGE_DIR)])
+    monkeypatch.setattr(sys, 'argv', args)
+    return args
+
+
+@pytest.fixture
+def allow_empty(request, monkeypatch, fake_package_dir):
+    monkeypatch.setattr(sys, 'argv', fake_package_dir + ['--allow-empty'])
 
 
 @pytest.fixture(params=['linux', 'macos', 'windows'])
@@ -66,14 +73,6 @@ def platform(request, monkeypatch):
     else:
         monkeypatch.setattr(platform_module, 'machine', lambda: 'x86_64')
 
-    marker = request.node.get_closest_marker('allow_empty')
-    if marker is not None and (len(marker.args) == 0 or platform_value in marker.args):
-        def pass_exit(val: int):
-            if val not in {3}:
-                sys.exit(val)
-
-        monkeypatch.setattr(sys, 'exit', pass_exit)
-
     return platform_value
 
 

unit_test/main_tests/main_options_test.py

@@ -40,8 +40,7 @@ def test_output_dir_argument(also_set_environment, platform, intercepted_build_a
     assert intercepted_build_args.args[0].output_dir == OUTPUT_DIR
 
 
-@pytest.mark.allow_empty
-def test_build_selector(platform, intercepted_build_args, monkeypatch):
+def test_build_selector(platform, intercepted_build_args, monkeypatch, allow_empty):
     BUILD = 'some build* *-selector'
     SKIP = 'some skip* *-selector'
 
@@ -223,7 +222,6 @@ def test_build_verbosity(build_verbosity, platform_specific, platform, intercept
     assert intercepted_build_args.args[0].build_verbosity == expected_verbosity
 
 
-@pytest.mark.allow_empty
 @pytest.mark.parametrize('option_name', ['CIBW_BUILD', 'CIBW_SKIP'])
 @pytest.mark.parametrize('option_value, build_selector_patterns', [
     ('*-manylinux1_*', ['*-manylinux_*']),
@@ -231,7 +229,7 @@ def test_build_verbosity(build_verbosity, platform_specific, platform, intercept
     ('*-macosx_10_9_x86_64', ['*-macosx_x86_64']),
     ('cp37-macosx_10_9_x86_64', ['cp37-macosx_x86_64']),
 ])
-def test_build_selector_migrations(intercepted_build_args, monkeypatch, option_name, option_value, build_selector_patterns):
+def test_build_selector_migrations(intercepted_build_args, monkeypatch, option_name, option_value, build_selector_patterns, allow_empty):
     monkeypatch.setenv(option_name, option_value)
 
     main()

unit_test/main_tests/main_platform_test.py

@@ -67,22 +67,25 @@ def test_platform_environment(platform, intercepted_build_args, monkeypatch):
     assert intercepted_build_args.args[0].package_dir == MOCK_PACKAGE_DIR
 
 
-@pytest.mark.allow_empty('windows')
 def test_archs_default(platform, intercepted_build_args, monkeypatch):
-    monkeypatch.setattr(platform_module, 'machine', lambda: 'x86_64')
+    monkeypatch.setattr(platform_module, 'machine', lambda: 'AMD64' if platform == 'windows' else 'x86_64')
 
     main()
     build_options = intercepted_build_args.args[0]
 
     if platform == 'linux':
         assert build_options.architectures == {Architecture.x86_64, Architecture.i686}
+    elif platform == 'windows':
+        assert build_options.architectures == {Architecture.AMD64, Architecture.x86}
     else:
         assert build_options.architectures == {Architecture.x86_64}
 
 
-@pytest.mark.allow_empty('windows')
 @pytest.mark.parametrize('use_env_var', [False, True])
 def test_archs_argument(platform, intercepted_build_args, monkeypatch, use_env_var):
+    if platform == 'windows':
+        pytest.skip('Will have empty build selectors on Windows')
+
     monkeypatch.setattr(platform_module, 'machine', lambda: 'x86_64')
     if use_env_var:
         monkeypatch.setenv('CIBW_ARCHS', 'ppc64le')
@@ -114,9 +117,8 @@ def test_archs_platform_specific(platform, intercepted_build_args, monkeypatch):
         assert build_options.architectures == {Architecture.x86_64}
 
 
-@pytest.mark.allow_empty('windows')
 def test_archs_platform_native(platform, intercepted_build_args, monkeypatch):
-    monkeypatch.setattr(platform_module, 'machine', lambda: 'x86_64')
+    monkeypatch.setattr(platform_module, 'machine', lambda: 'AMD64' if platform == 'windows' else 'x86_64')
     monkeypatch.setenv('CIBW_ARCHS', 'native')
 
     main()
@@ -125,7 +127,7 @@ def test_archs_platform_native(platform, intercepted_build_args, monkeypatch):
     if platform == 'linux':
         assert build_options.architectures == {Architecture.x86_64}
     elif platform == 'windows':
-        assert build_options.architectures == {Architecture.x86_64}
+        assert build_options.architectures == {Architecture.AMD64}
     elif platform == 'macos':
         assert build_options.architectures == {Architecture.x86_64}