Fix rmm build (#7973)

- Optionally switch to c++17
- Use rmm CMake target.
- Workaround compiler errors.
- Fix GPUMetric inheritance.
- Run death tests even if it's built with RMM support.

Co-authored-by: jakirkham <jakirkham@gmail.com>

src/data/data.cu

@@ -130,12 +130,12 @@ void MetaInfo::SetInfoFromCUDA(Context const&, StringView key, Json array) {
   }
   // uint info
   if (key == "group") {
-    auto array_interface{ArrayInterface<1>(array)};
+    ArrayInterface<1> array_interface{array};
     CopyGroupInfoImpl(array_interface, &group_ptr_);
     data::ValidateQueryGroup(group_ptr_);
     return;
   } else if (key == "qid") {
-    auto array_interface{ArrayInterface<1>(array)};
+    ArrayInterface<1> array_interface{array};
     CopyQidImpl(array_interface, &group_ptr_);
     data::ValidateQueryGroup(group_ptr_);
     return;

src/metric/metric_common.h

@@ -1,5 +1,5 @@
 /*!
- * Copyright 2018-2020 by Contributors
+ * Copyright 2018-2022 by Contributors
  * \file metric_common.h
  */
 #ifndef XGBOOST_METRIC_METRIC_COMMON_H_
@@ -9,6 +9,7 @@
 #include <string>
 
 #include "../common/common.h"
+#include "xgboost/metric.h"
 
 namespace xgboost {
 

src/metric/rank_metric.cu

@@ -27,7 +27,7 @@ DMLC_REGISTRY_FILE_TAG(rank_metric_gpu);
 
 /*! \brief Evaluate rank list on GPU */
 template <typename EvalMetricT>
-struct EvalRankGpu : public Metric, public EvalRankConfig {
+struct EvalRankGpu : public GPUMetric, public EvalRankConfig {
  public:
   double Eval(const HostDeviceVector<bst_float> &preds, const MetaInfo &info,
               bool distributed) override {