[onert/train] Apply inline variable to the metadata name (#14641)

This commit applies inline variable to the metadata name.

ONE-DCO-1.0-Signed-off-by: ragmani <[email protected]>

runtime/onert/core/include/loader/TrainInfoLoader.h

@@ -26,8 +26,7 @@ namespace onert
 namespace loader
 {
 
-// TODO change this line to use inline variable after C++17
-extern const char *const TRAININFO_METADATA_NAME;
+inline const char *const TRAININFO_METADATA_NAME = "CIRCLE_TRAINING";
 
 std::unique_ptr<ir::train::TrainingInfo> loadTrainingInfo(const uint8_t *buffer, const size_t size);
 

runtime/onert/core/src/exporter/CircleExporter.cc

@@ -18,6 +18,7 @@
 
 #include "exec/Execution.h"
 #include "ir/train/TrainingInfo.h"
+#include "loader/TrainInfoLoader.h"
 #include "circle_schema_generated.h"
 #include "TrainInfoBuilder.h"
 
@@ -98,13 +99,11 @@ void CircleExporter::updateWeight(const std::unique_ptr<exec::Execution> &exec)
 
 void CircleExporter::updateMetadata(const std::unique_ptr<ir::train::TrainingInfo> &training_info)
 {
-  const char *const TRAININFO_METADATA_NAME = "CIRCLE_TRAINING";
-
   TrainInfoBuilder tbuilder(training_info);
   bool found = false;
   for (const auto &meta : _model->metadata)
   {
-    if (meta->name == std::string{TRAININFO_METADATA_NAME})
+    if (meta->name == std::string{loader::TRAININFO_METADATA_NAME})
     {
       std::lock_guard<std::mutex> guard(_mutex);
       const uint32_t buf_idx = meta->buffer;
@@ -131,7 +130,7 @@ void CircleExporter::updateMetadata(const std::unique_ptr<ir::train::TrainingInf
     memcpy(buffer->data.data(), tbuilder.get(), buffer->size);
 
     auto meta = std::make_unique<::circle::MetadataT>();
-    meta->name = std::string{TRAININFO_METADATA_NAME};
+    meta->name = std::string{loader::TRAININFO_METADATA_NAME};
     meta->buffer = _model->buffers.size();
 
     _model->buffers.push_back(std::move(buffer));

runtime/onert/core/src/loader/TrainInfoLoader.cc

@@ -24,8 +24,6 @@ namespace onert
 namespace loader
 {
 
-const char *const TRAININFO_METADATA_NAME = "CIRCLE_TRAINING";
-
 namespace
 {