+ if(state>PREPARING)
+ return;
+ if(state==PREPARING)
+ {
+ builder.get_logger().log("problems", "Dependency cycle detected at %s", name);
+ problems.push_back("Dependency cycle detected");
+ state = BROKEN;
+ return;
+ }
+
+ state = PREPARING;
+ if(tool)
+ tool->prepare();
+
+ find_dependencies();
+ bool broken = !problems.empty();
+
+ if(tool)
+ {
+ if(FileTarget *tool_exe = tool->get_executable())
+ add_dependency(*tool_exe);
+ broken |= !tool->get_problems().empty();
+
+ // Only check package and component problems for buildable targets
+ // XXX How to propagate nested package problems?
+ broken |= (package && !package->get_problems().empty());
+ broken |= (component && !component->get_problems().empty());
+ }
+
+ for(Target *d: depends)
+ {
+ d->prepare();
+ broken |= d->is_broken();
+ }
+ for(Target *d: trans_depends)
+ d->prepare();
+
+ check_rebuild();
+ if(broken)
+ state = BROKEN;
+ else if(state==PREPARING)
+ state = UPTODATE;
+
+ for(Target *d: depends)
+ d->signal_bubble_rebuild.connect(sigc::mem_fun(this, &Target::check_rebuild));
+}
+
+Task *Target::build()
+{
+ if(primary_target)
+ return primary_target->build();
+
+ Task *task = tool->run(*this);
+ task->signal_finished.connect(sigc::mem_fun(this, &Target::build_finished));
+ state = BUILDING;
+
+ build(*task);
+ for(Target *s: side_effects)
+ s->build(*task);
+
+ return task;
+}
+
+void Target::build_finished(bool success)
+{
+ state = UPTODATE;
+ if(success)
+ {
+ modified();
+ for(Target *s: side_effects)
+ s->build_finished(success);
+ signal_modified.emit();
+ }