[PATCH 2/3] Fix inheritance of scope_decl::insert_member_decl

[Giuliano Procida <gprocida@google.com>]

The classes class_decl, class_or_union and scope_decl derive from each
other. The method insert_member_decl is declared virtual and defined
in each of these. Unfortunately, it has different argument types in
the base scope_decl class.

Most calls to insert_member_decl are at a statically known class, but
in insert_decl_into_scope the method is called via a scope_decl
pointer. There is the possibility that this could be a type derived
from scope_decl rather than scope_decl itself, in which case the base
method would be called, not as intended.

This commit adjusts the type of the member argument to
scope_decl::insert_member_decl to match the other two classes and
eliminates the last trigger of Clang's -Werror-overloaded-virtual.

	* include/abg-ir.h (scope_decl::insert_member_decl): Change
	type of member argument from const decl_base_sptr& to plain
	decl_base_sptr.
	* src/abg-ir.cc (scope_decl::insert_member_decl): Likewise.

Signed-off-by: Giuliano Procida <gprocida@google.com>
---
 include/abg-ir.h | 3 +--
 src/abg-ir.cc    | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/include/abg-ir.h b/include/abg-ir.h
index c2b66c4c..ea6a7ce4 100644
--- a/include/abg-ir.h
+++ b/include/abg-ir.h
@@ -1653,8 +1653,7 @@ protected:
   add_member_decl(const decl_base_sptr& member);
 
   virtual decl_base_sptr
-  insert_member_decl(const decl_base_sptr& member,
-		     declarations::iterator before);
+  insert_member_decl(decl_base_sptr member, declarations::iterator before);
 
   virtual void
   remove_member_decl(decl_base_sptr member);
diff --git a/src/abg-ir.cc b/src/abg-ir.cc
index a434ec69..a257cf67 100644
--- a/src/abg-ir.cc
+++ b/src/abg-ir.cc
@@ -6081,7 +6081,7 @@ scope_decl::add_member_decl(const decl_base_sptr& member)
 /// @param before an interator pointing to the element before which
 /// the new member should be inserted.
 decl_base_sptr
-scope_decl::insert_member_decl(const decl_base_sptr& member,
+scope_decl::insert_member_decl(decl_base_sptr member,
 			       declarations::iterator before)
 {
   ABG_ASSERT(!member->get_scope());
-- 
2.27.0.383.g050319c2ae-goog