* decl2.c (maybe_emit_vtables): Produce same comdat group when outputting

	comdat vtables.
	(cxx_callgraph_analyze_expr): Remove code marking vtables needed.

	* cgraph.h (struct varpool_node): Add same_comdat_group.
	* lto-cgrpah.c (lto_output_varpool_node): Output same_comdat_group
	pointer.
	(output_varpool): Update call of lto_output_varpool_node.
	(input_varpool): Read same_comdat_group pointer.
	(input_varpool_1): Fixup same_comdat_group pointer.
	* ipa.c (cgraph_remove_unreachable_nodes): WHen one of same comdat
	group is needed, all are.
	* varpool.c (varpool_remove_node): Remove node from same comdat group
	linklist too.
	(varpool_analyze_pending_decls): Walk same comdat groups.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@159699 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 15 insertions, 0 deletions

diff --git a/gcc/ipa.c b/gcc/ipa.c
index c8b0d7b385d..319a3f1b8bb 100644
--- a/gcc/ipa.c
+++ b/gcc/ipa.c
@@ -334,6 +334,21 @@ cgraph_remove_unreachable_nodes (bool before_inlining_p, FILE *file)
 	  first_varpool = (struct varpool_node *)first_varpool->aux;
 	  vnode->aux = NULL;
 	  process_references (&vnode->ref_list, &first, &first_varpool, before_inlining_p);
+	  /* If any function in a comdat group is reachable, force
+	     all other functions in the same comdat group to be
+	     also reachable.  */
+	  if (vnode->same_comdat_group)
+	    {
+	      struct varpool_node *next;
+	      for (next = vnode->same_comdat_group;
+		   next != vnode;
+		   next = next->same_comdat_group)
+		if (!next->needed)
+		  {
+		    varpool_mark_needed_node (next);
+		    enqueue_varpool_node (next, &first_varpool);
+		  }
+	    }
 	}
     }