Implement stdsplit builtin option.

mesonbuild/backend/ninjabackend.py

@@ -583,7 +583,10 @@ int dummy;
         valgrind = environment.find_valgrind()
         script_root = self.environment.get_script_dir()
         test_data = os.path.join(self.environment.get_scratch_dir(), 'meson_test_setup.dat')
-        cmd = [sys.executable, self.environment.get_build_command(), '--internal', 'test', test_data]
+        cmd = [ sys.executable, self.environment.get_build_command(), '--internal', 'test' ]
+        if not self.environment.coredata.get_builtin_option('stdsplit'):
+            cmd += ['--no-stdsplit']
+        cmd += [ test_data ]
         elem = NinjaBuildElement(self.all_outputs, 'test', 'CUSTOM_COMMAND', ['all', 'PHONY'])
         elem.add_item('COMMAND', cmd)
         elem.add_item('DESC', 'Running all tests.')

mesonbuild/coredata.py

@@ -210,6 +210,7 @@ builtin_options = {
         'layout'            : [ UserComboOption, 'Build directory layout.', ['mirror', 'flat' ], 'mirror' ],
         'default_library'   : [ UserComboOption, 'Default library type.', [ 'shared', 'static' ], 'shared' ],
         'backend'           : [ UserComboOption, 'Backend to use.', [ 'ninja', 'vs2010', 'xcode' ], 'ninja' ],
+        'stdsplit'          : [ UserBooleanOption, 'Split stdout and stderr in test logs.', True ],
         }
 
 forbidden_target_names = {'clean': None,