[build] Move settings generation from Python to Rust code;

lib/codegen/meta-python/cdsl/settings.py

@@ -340,7 +340,7 @@ class SettingGroup(object):
         precomputed predicates.
 
         This is the size of the byte-sized settings plus all the numbered
-        predcate bits rounded up to a whole number of bytes.
+        predicate bits rounded up to a whole number of bytes.
         """
         return self.boolean_offset + (len(self.predicate_number) + 7) // 8
 

lib/codegen/meta-python/gen_settings.py

@@ -255,8 +255,8 @@ def gen_display(sgrp, fmt):
             fmt.line('Ok(())')
 
 
-def gen_constructor(sgrp, parent, fmt):
-    # type: (SettingGroup, PredContext, srcgen.Formatter) -> None
+def gen_constructor(sgrp, fmt):
+    # type: (SettingGroup, srcgen.Formatter) -> None
     """
     Generate a Flags constructor.
     """
@@ -310,7 +310,7 @@ def gen_group(sgrp, fmt):
     with fmt.indented('pub struct Flags {', '}'):
         fmt.line('bytes: [u8; {}],'.format(sgrp.byte_size()))
 
-    gen_constructor(sgrp, None, fmt)
+    gen_constructor(sgrp, fmt)
     gen_enum_types(sgrp, fmt)
     gen_getters(sgrp, fmt)
     gen_descriptors(sgrp, fmt)