PR c++/5857
* decl.c (duplicate_decls): Use merge_types instead of common_type.
* typeck.c (common_type): Just hand off to
type_after_usual_arithmetic_conversions and
composite_pointer_type.
(merge_types): New fn.
(commonparms): Use it instead of common_type.
(type_after_usual_arithmetic_conversions): Also handle COMPLEX_TYPE.
(composite_pointer_type): Also handle attributes.
* cp-tree.h: Declare merge_types.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@50820
138bc75d-0d04-0410-961f-
82ee72b054a4