modules/qt: use append rather than extend in preprocess

Because that's what we need, of course

mesonbuild/modules/qt.py

@@ -428,11 +428,11 @@ def preprocess(self, state: 'ModuleState', args: T.List[T.Union[str, File]], kwa
  if not isinstance(args[0], str):
  raise build.InvalidArguments('First argument to qt.preprocess must be a string')
  rcc_kwargs['name'] = args[0]
- sources.extend(self.compile_resources(state, tuple(), rcc_kwargs).return_value)
+ sources.append(self.compile_resources(state, tuple(), rcc_kwargs).return_value)
 
  if kwargs['ui_files']:
  ui_kwargs: 'UICompilerKwArgs' = {'sources': kwargs['ui_files'], 'extra_args': kwargs['uic_extra_arguments'], 'method': method}
- sources.extend(self.compile_ui(state, tuple(), ui_kwargs).return_value)
+ sources.append(self.compile_ui(state, tuple(), ui_kwargs).return_value)
 
  if kwargs['moc_headers'] or kwargs['moc_sources']:
  moc_kwargs: 'MocCompilerKwArgs' = {
@@ -443,7 +443,7 @@ def preprocess(self, state: 'ModuleState', args: T.List[T.Union[str, File]], kwa
  'dependencies': kwargs['dependencies'],
  'method': method,
  }
- sources.extend(self.compile_moc(state, tuple(), moc_kwargs).return_value)
+ sources.append(self.compile_moc(state, tuple(), moc_kwargs).return_value)
 
  return ModuleReturnValue(sources, [sources])
 

test cases/frameworks/4 qt/meson.build

@@ -57,6 +57,10 @@ foreach qt : ['qt4', 'qt5', 'qt6']
  # XML files that need to be compiled with the uic tol.
  prep += qtmodule.compile_ui(sources : 'mainWindow.ui', method: get_option('method'))
 
+ qtmodule.preprocess(
+ ui_files : 'mainWindow.ui',
+ method: get_option('method'))
+
  # Resource file(s) for rcc compiler
  extra_cpp_args = []
  if meson.is_unity()
@@ -100,6 +104,12 @@ foreach qt : ['qt4', 'qt5', 'qt6']
  # The build system needs to include the cpp files from
  # headers but the user must manually include moc
  # files from sources.
+ qtmodule.preprocess(
+ moc_extra_arguments : ['-DMOC_EXTRA_FLAG'], # This is just a random macro to test `extra_arguments`
+ moc_sources : 'manualinclude.cpp',
+ moc_headers : 'manualinclude.h',
+ method : get_option('method'))
+
  manpreprocessed = qtmodule.compile_moc(
  extra_args : ['-DMOC_EXTRA_FLAG'], # This is just a random macro to test `extra_arguments`
  sources : 'manualinclude.cpp',