options: give priority to parent augments over child default_options

Restore behavior of 1.7.

Signed-off-by: Paolo Bonzini <[email protected]>

Author: bonzini

mesonbuild/options.py

@@ -1357,16 +1357,32 @@ def initialize_from_subproject_call(self,
                                         project_default_options: OptionDict,
                                         cmd_line_options: OptionDict,
                                         machine_file_options: OptionDict) -> None:
-        # pick up pending per-project settings from the toplevel project() invocation
-        options = {k: v for k, v in self.pending_subproject_options.items() if k.subproject == subproject}
 
-        # apply project() and subproject() default_options
-        for key, valstr in itertools.chain(project_default_options.items(), spcall_default_options.items()):
+        options: OptionDict = {}
+
+        # project() default_options
+        for key, valstr in project_default_options.items():
+            if key.subproject == subproject:
+                without_subp = key.evolve(subproject=None)
+                raise MesonException(f'subproject name not needed in default_options; use "{without_subp}" instead of "{key}"')
+
             if key.subproject is None:
                 key = key.evolve(subproject=subproject)
-            elif key.subproject == subproject:
+            options[key] = valstr
+
+        # augments from the toplevel project() default_options
+        for key, valstr in self.pending_subproject_options.items():
+            if key.subproject == subproject:
+                options[key] = valstr
+
+        # subproject() default_options
+        for key, valstr in spcall_default_options.items():
+            if key.subproject == subproject:
                 without_subp = key.evolve(subproject=None)
                 raise MesonException(f'subproject name not needed in default_options; use "{without_subp}" instead of "{key}"')
+
+            if key.subproject is None:
+                key = key.evolve(subproject=subproject)
             options[key] = valstr
 
         # then global settings from machine file and command line

unittests/optiontests.py

@@ -274,6 +274,26 @@ def test_subproject_cmdline_override_global(self):
         self.assertEqual(optstore.get_value_for(name, subp), new_value)
         self.assertEqual(optstore.get_value_for(name), new_value)
 
+    def test_subproject_parent_override_subp(self):
+        name = 'optimization'
+        subp = 'subp'
+        default_value = 's'
+        subp_value = '0'
+
+        optstore = OptionStore(False)
+        prefix = UserStringOption('prefix', 'This is needed by OptionStore', '/usr')
+        optstore.add_system_option('prefix', prefix)
+        o = UserComboOption(name, 'Optimization level', '0', choices=['plain', '0', 'g', '1', '2', '3', 's'])
+        optstore.add_system_option(name, o)
+
+        toplevel_proj_default = {OptionKey(name, subproject=subp): subp_value, OptionKey(name): default_value}
+        subp_proj_default = {OptionKey(name): '3'}
+
+        optstore.initialize_from_top_level_project_call(toplevel_proj_default, {}, {})
+        optstore.initialize_from_subproject_call(subp, {}, subp_proj_default, {}, {})
+        self.assertEqual(optstore.get_value_for(name, subp), subp_value)
+        self.assertEqual(optstore.get_value_for(name), default_value)
+
     def test_subproject_cmdline_override_global_and_augment(self):
         name = 'optimization'
         subp = 'subp'