Silence some encoding warnings

By specifiying explicit encodings, we can silence warnings like:

 /__w/meson/meson/test cases/common/100 postconf with args/postconf.py:15: EncodingWarning: 'encoding' argument not specified
  with open(input_file) as f:

in CI.

test cases/common/100 postconf with args/postconf.py

@@ -12,7 +12,7 @@ template = '''#pragma once
 input_file = os.path.join(os.environ['MESON_SOURCE_ROOT'], 'raw.dat')
 output_file = os.path.join(os.environ['MESON_BUILD_ROOT'], 'generated.h')
 
-with open(input_file) as f:
+with open(input_file, encoding='utf-8') as f:
     data = f.readline().strip()
-with open(output_file, 'w') as f:
+with open(output_file, 'w', encoding='utf-8') as f:
     f.write(template.format(data, sys.argv[1], sys.argv[2]))

test cases/common/99 postconf/postconf.py

@@ -10,7 +10,7 @@ template = '''#pragma once
 input_file = os.path.join(os.environ['MESON_SOURCE_ROOT'], 'raw.dat')
 output_file = os.path.join(os.environ['MESON_BUILD_ROOT'], 'generated.h')
 
-with open(input_file) as f:
+with open(input_file, encoding='utf-8') as f:
     data = f.readline().strip()
-with open(output_file, 'w') as f:
+with open(output_file, 'w', encoding='utf-8') as f:
     f.write(template.format(data))

unittests/allplatformstests.py

@@ -2718,7 +2718,7 @@ class AllPlatformTests(BasePlatformTests):
     def test_native_dep_pkgconfig(self):
         testdir = os.path.join(self.unit_test_dir,
                                '45 native dep pkgconfig var')
-        with tempfile.NamedTemporaryFile(mode='w', delete=False) as crossfile:
+        with tempfile.NamedTemporaryFile(mode='w', delete=False, encoding='utf-8') as crossfile:
             crossfile.write(textwrap.dedent(
                 '''[binaries]
                 pkgconfig = '{}'
@@ -2745,7 +2745,7 @@ class AllPlatformTests(BasePlatformTests):
     def test_pkg_config_libdir(self):
         testdir = os.path.join(self.unit_test_dir,
                                '45 native dep pkgconfig var')
-        with tempfile.NamedTemporaryFile(mode='w', delete=False) as crossfile:
+        with tempfile.NamedTemporaryFile(mode='w', delete=False, encoding='utf-8') as crossfile:
             crossfile.write(textwrap.dedent(
                 '''[binaries]
                 pkgconfig = 'pkg-config'
@@ -4196,7 +4196,7 @@ class AllPlatformTests(BasePlatformTests):
         cmd = self.meson_command + ['devenv', '-C', self.builddir, '--dump', fname]
         o = self._run(cmd)
         self.assertEqual(o, '')
-        o = Path(fname).read_text()
+        o = Path(fname).read_text(encoding='utf-8')
         expected = os.pathsep.join(['/prefix', '$TEST_C', '/suffix'])
         self.assertIn(f'TEST_C="{expected}"', o)
         self.assertIn('export TEST_C', o)
@@ -4697,7 +4697,7 @@ class AllPlatformTests(BasePlatformTests):
 
         testdir = os.path.join(self.unit_test_dir, '102 rlib linkage')
         gen_file = os.path.join(testdir, 'lib.rs')
-        with open(gen_file, 'w') as f:
+        with open(gen_file, 'w', encoding='utf-8') as f:
             f.write(template.format(0))
         self.addCleanup(windows_proof_rm, gen_file)
 
@@ -4705,7 +4705,7 @@ class AllPlatformTests(BasePlatformTests):
         self.build()
         self.run_tests()
 
-        with open(gen_file, 'w') as f:
+        with open(gen_file, 'w', encoding='utf-8') as f:
             f.write(template.format(39))
 
         self.build()

unittests/internaltests.py

@@ -453,7 +453,7 @@ class InternalTests(unittest.TestCase):
         # Can not be used as context manager because we need to
         # open it a second time and this is not possible on
         # Windows.
-        configfile = tempfile.NamedTemporaryFile(mode='w+', delete=False)
+        configfile = tempfile.NamedTemporaryFile(mode='w+', delete=False, encoding='utf-8')
         configfilename = configfile.name
         config.write(configfile)
         configfile.flush()
@@ -469,7 +469,7 @@ class InternalTests(unittest.TestCase):
             'needs_exe_wrapper': 'true' if desired_value else 'false'
         }
 
-        configfile = tempfile.NamedTemporaryFile(mode='w+', delete=False)
+        configfile = tempfile.NamedTemporaryFile(mode='w+', delete=False, encoding='utf-8')
         configfilename = configfile.name
         config.write(configfile)
         configfile.close()

unittests/linuxliketests.py

@@ -1024,7 +1024,7 @@ class LinuxlikeTests(BasePlatformTests):
 
     def test_cross_find_program(self):
         testdir = os.path.join(self.unit_test_dir, '11 cross prog')
-        crossfile = tempfile.NamedTemporaryFile(mode='w')
+        crossfile = tempfile.NamedTemporaryFile(mode='w', encoding='utf-8')
         print(os.path.join(testdir, 'some_cross_tool.py'))
 
         tool_path = os.path.join(testdir, 'some_cross_tool.py')
@@ -1517,14 +1517,14 @@ class LinuxlikeTests(BasePlatformTests):
     def test_identity_cross(self):
         testdir = os.path.join(self.unit_test_dir, '60 identity cross')
 
-        constantsfile = tempfile.NamedTemporaryFile(mode='w')
+        constantsfile = tempfile.NamedTemporaryFile(mode='w', encoding='utf-8')
         constantsfile.write(textwrap.dedent('''\
             [constants]
             py_ext = '.py'
             '''))
         constantsfile.flush()
 
-        nativefile = tempfile.NamedTemporaryFile(mode='w')
+        nativefile = tempfile.NamedTemporaryFile(mode='w', encoding='utf-8')
         nativefile.write(textwrap.dedent('''\
             [binaries]
             c = ['{}' + py_ext]
@@ -1532,7 +1532,7 @@ class LinuxlikeTests(BasePlatformTests):
         nativefile.flush()
         self.meson_native_files = [constantsfile.name, nativefile.name]
 
-        crossfile = tempfile.NamedTemporaryFile(mode='w')
+        crossfile = tempfile.NamedTemporaryFile(mode='w', encoding='utf-8')
         crossfile.write(textwrap.dedent('''\
             [binaries]
             c = ['{}' + py_ext]
@@ -1549,7 +1549,7 @@ class LinuxlikeTests(BasePlatformTests):
             'CC_FOR_BUILD': '"' + os.path.join(testdir, 'build_wrapper.py') + '"',
             'CC': '"' + os.path.join(testdir, 'host_wrapper.py') + '"',
         }
-        crossfile = tempfile.NamedTemporaryFile(mode='w')
+        crossfile = tempfile.NamedTemporaryFile(mode='w', encoding='utf-8')
         crossfile.write('')
         crossfile.flush()
         self.meson_cross_files = [crossfile.name]

unittests/machinefiletests.py

@@ -754,7 +754,7 @@ class CrossFileTests(BasePlatformTests):
         with tempfile.TemporaryDirectory() as d:
             dir_ = os.path.join(d, 'meson', 'cross')
             os.makedirs(dir_)
-            with tempfile.NamedTemporaryFile('w', dir=dir_, delete=False) as f:
+            with tempfile.NamedTemporaryFile('w', dir=dir_, delete=False, encoding='utf-8') as f:
                 f.write(cross_content)
             name = os.path.basename(f.name)
 
@@ -770,7 +770,7 @@ class CrossFileTests(BasePlatformTests):
         with tempfile.TemporaryDirectory() as d:
             dir_ = os.path.join(d, '.local', 'share', 'meson', 'cross')
             os.makedirs(dir_)
-            with tempfile.NamedTemporaryFile('w', dir=dir_, delete=False) as f:
+            with tempfile.NamedTemporaryFile('w', dir=dir_, delete=False, encoding='utf-8') as f:
                 f.write(cross_content)
             name = os.path.basename(f.name)
 

unittests/platformagnostictests.py

@@ -246,10 +246,10 @@ class PlatformAgnosticTests(BasePlatformTests):
 
         self.init(testdir)
         self._run(self.meson_command + ['--internal', 'regenerate', '--profile-self', testdir, self.builddir])
-        with open(os.path.join(self.builddir, 'meson-logs', 'profile-startup-modules.json')) as f:
+        with open(os.path.join(self.builddir, 'meson-logs', 'profile-startup-modules.json'), encoding='utf-8') as f:
                 data = json.load(f)['meson']
 
-        with open(os.path.join(testdir, 'expected_mods.json')) as f:
+        with open(os.path.join(testdir, 'expected_mods.json'), encoding='utf-8') as f:
             expected = json.load(f)['meson']['modules']
 
         self.assertEqual(data['modules'], expected)