+ mark_rebuild(d->get_name()+" has changed");
+ else if(d->needs_rebuild())
+ mark_rebuild(d->get_name()+" needs rebuilding");
+ if(needs_rebuild())
+ break;
+ }
+ }
+
+ if(!needs_rebuild())
+ {
+ // Some side effects might not exist
+ auto i = find_if(side_effects, [](const Target *s){ return s->needs_rebuild(); });
+ if(i!=side_effects.end())
+ mark_rebuild((*i)->get_name()+" needs rebuilding");
+ }
+
+ if(!needs_rebuild() && package)
+ {
+ if(package->get_config().get_mtime()>mtime)
+ mark_rebuild("Package options changed");
+
+ if(tool->get_executable())
+ {
+ string build_sig = create_build_signature();
+ if(package->get_cache().has_key(this, "build_sig"))
+ {
+ if(package->get_cache().get_value(this, "build_sig")!=build_sig)
+ mark_rebuild("Build signature changed");
+ }
+ }
+ }
+}
+
+string FileTarget::create_build_signature() const
+{
+ if(!package)
+ return string();
+
+ const BuildInfo &binfo = (component ? component->get_build_info() : package->get_build_info());
+ vector<string> sigs;
+
+ if(arch_in_build_sig)
+ if(const Architecture *arch = tool->get_architecture())
+ sigs.push_back(arch->get_name());
+
+ sigs.push_back(tool->create_build_signature(binfo));
+
+ if(nested_build_sig && component)
+ {
+ vector<const Tool *> seen_tools;
+ vector<string> tool_sigs;
+ for(Target *d: depends)
+ if(const Tool *t = d->get_tool())
+ if(d->get_component()==component && !any_equals(seen_tools, t))
+ {
+ seen_tools.push_back(t);
+ tool_sigs.push_back(t->create_build_signature(binfo));
+ }
+
+ sort(tool_sigs);
+ sigs.insert(sigs.end(), make_move_iterator(tool_sigs.begin()), make_move_iterator(tool_sigs.end()));
+ }
+
+ return join(sigs.begin(), sigs.end(), ";");
+}
+
+void FileTarget::build(Task &task)
+{
+ task.add_file(path);
+ task.set_unlink(true);
+}
+
+void FileTarget::build_finished(bool success)
+{
+ if(success)
+ {
+ stat();
+ if(package)
+ {
+ string build_sig = create_build_signature();
+ if(!build_sig.empty())
+ package->get_cache().set_value(this, "build_sig", build_sig);