+ if(state>PREPARING)
+ return;
+ if(state==PREPARING)
+ {
+ builder.problem((package ? package->get_name() : string()), "Dependency cycle detected at "+name);
+ return;
+ }
+
+ state = PREPARING;
+ find_dependencies();
+ if(tool)
+ {
+ if(FileTarget *tool_exe = tool->get_executable())
+ add_dependency(*tool_exe);
+ }
+
+ for(Dependencies::iterator i=depends.begin(); i!=depends.end(); ++i)
+ (*i)->prepare();
+
+ check_rebuild();
+ if(state==PREPARING)
+ state = UPTODATE;
+
+ for(Dependencies::iterator i=depends.begin(); i!=depends.end(); ++i)
+ (*i)->signal_bubble_rebuild.connect(sigc::mem_fun(this, &Target::check_rebuild));
+}
+
+Task *Target::build()
+{
+ if(!tool)
+ {
+ // This special case is needed for VirtualTargets
+ state = UPTODATE;
+ return 0;
+ }
+
+ Task *task = tool->run(*this);
+ task->signal_finished.connect(sigc::mem_fun(this, &Target::build_finished));
+ state = BUILDING;
+
+ return task;
+}
+
+void Target::build_finished(bool success)
+{
+ state = UPTODATE;
+ if(success)
+ {
+ modified();
+ for(Dependencies::const_iterator i=side_effects.begin(); i!=side_effects.end(); ++i)
+ (*i)->build_finished(success);
+ }