+/* Look for externally_visible and used attributes and mark cgraph nodes
+ accordingly.
+
+ We cannot mark the nodes at the point the attributes are processed (in
+ handle_*_attribute) because the copy of the declarations available at that
+ point may not be canonical. For example, in:
+
+ void f();
+ void f() __attribute__((used));
+
+ the declaration we see in handle_used_attribute will be the second
+ declaration -- but the front end will subsequently merge that declaration
+ with the original declaration and discard the second declaration.
+
+ Furthermore, we can't mark these nodes in cgraph_finalize_function because:
+
+ void f() {}
+ void f() __attribute__((externally_visible));
+
+ is valid.
+
+ So, we walk the nodes at the end of the translation unit, applying the
+ attributes at that point. */
+
+static void
+process_function_and_variable_attributes (struct cgraph_node *first,
+ struct varpool_node *first_var)
+{
+ struct cgraph_node *node;
+ struct varpool_node *vnode;
+
+ for (node = cgraph_nodes; node != first; node = node->next)
+ {
+ tree decl = node->decl;
+ if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
+ {
+ mark_decl_referenced (decl);
+ if (node->local.finalized)
+ cgraph_mark_needed_node (node);
+ }
+ if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl)))
+ {
+ if (! TREE_PUBLIC (node->decl))
+ warning (OPT_Wattributes,
+ "%J%<externally_visible%> attribute have effect only on public objects",
+ node->decl);
+ else
+ {
+ if (node->local.finalized)
+ cgraph_mark_needed_node (node);
+ node->local.externally_visible = true;
+ }
+ }
+ }
+ for (vnode = varpool_nodes; vnode != first_var; vnode = vnode->next)
+ {
+ tree decl = vnode->decl;
+ if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
+ {
+ mark_decl_referenced (decl);
+ if (vnode->finalized)
+ varpool_mark_needed_node (vnode);
+ }
+ if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl)))
+ {
+ if (! TREE_PUBLIC (vnode->decl))
+ warning (OPT_Wattributes,
+ "%J%<externally_visible%> attribute have effect only on public objects",
+ vnode->decl);
+ else
+ {
+ if (vnode->finalized)
+ varpool_mark_needed_node (vnode);
+ vnode->externally_visible = true;
+ }
+ }
+ }
+}
+