environment: don't load project options from a native file in a cross build

mesonbuild/environment.py

@@ -786,7 +786,9 @@ class Environment:
                     if key.subproject:
                         raise MesonException('Do not set subproject options in [built-in options] section, use [subproject:built-in options] instead.')
                     self.options[key.evolve(subproject=subproject, machine=machine)] = v
-            elif section == 'project options':
+            elif section == 'project options' and machine is MachineChoice.HOST:
+                # Project options are only for the host machine, we don't want
+                # to read these from the native file
                 for k, v in values.items():
                     # Project options are always for the host machine
                     key = OptionKey.from_string(k)

run_unittests.py

@@ -9202,7 +9202,7 @@ class CrossFileTests(BasePlatformTests):
             for section, entries in values.items():
                 f.write(f'[{section}]\n')
                 for k, v in entries.items():
-                    f.write(f"{k}='{v}'\n")
+                    f.write(f"{k}={v!r}\n")
         return filename
 
     def test_cross_file_dirs(self):
@@ -9368,6 +9368,22 @@ class CrossFileTests(BasePlatformTests):
                 break
         self.assertEqual(found, 2, 'Did not find all sections.')
 
+    def test_project_options_native_only(self) -> None:
+        # Do not load project options from a native file when doing a cross
+        # build
+        testcase = os.path.join(self.unit_test_dir, '19 array option')
+        config = self.helper_create_cross_file({'project options': {'list': ['bar', 'foo']}})
+        cross = self.helper_create_cross_file({'binaries': {}})
+
+        self.init(testcase, extra_args=['--native-file', config, '--cross-file', cross])
+        configuration = self.introspect('--buildoptions')
+        for each in configuration:
+            if each['name'] == 'list':
+                self.assertEqual(each['value'], ['foo', 'bar'])
+                break
+        else:
+            self.fail('Did not find expected option.')
+
 
 class TAPParserTests(unittest.TestCase):
     def assert_test(self, events, **kwargs):