[LIBXGBOOST] pass demo running.

src/objective/objective.cc

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+/*!
+ * Copyright 2015 by Contributors
+ * \file objective.cc
+ * \brief Registry of all objective functions.
+ */
+#include <xgboost/objective.h>
+#include <dmlc/registry.h>
+
+namespace dmlc {
+DMLC_REGISTRY_ENABLE(::xgboost::ObjFunctionReg);
+}  // namespace dmlc
+
+namespace xgboost {
+// implement factory functions
+ObjFunction* ObjFunction::Create(const std::string& name) {
+  auto *e = ::dmlc::Registry< ::xgboost::ObjFunctionReg>::Get()->Find(name);
+  if (e == nullptr) {
+    for (const auto& entry : ::dmlc::Registry< ::xgboost::ObjFunctionReg>::List()) {
+      LOG(INFO) << "Objective candidate: " << entry->name;
+    }
+    LOG(FATAL) << "Unknown objective function " << name;
+  }
+  return (e->body)();
+}
+}  // namespace xgboost
+
+namespace xgboost {
+namespace obj {
+// List of files that will be force linked in static links.
+DMLC_REGISTRY_LINK_TAG(regression_obj);
+DMLC_REGISTRY_LINK_TAG(multiclass_obj);
+DMLC_REGISTRY_LINK_TAG(rank_obj);
+}  // namespace obj
+}  // namespace xgboost