[DCS] Make DataPointValue streamable and macOS compatible

Author: aphecetche

Detectors/DCS/include/DetectorsDCS/DataPointValue.h

@@ -459,7 +459,7 @@ struct alignas(64) DataPointValue final {
          */
   inline std::unique_ptr<std::string> get_timestamp() const noexcept
   {
-#ifdef __linux__
+#if defined(__linux__) || defined(__APPLE__)
     // time_t should be uint64_t (compatible) on 64-bit Linux platforms:
     char buffer[17];
     std::time_t ts((uint64_t)sec);

Detectors/DCS/src/DetectorsDCSLinkDef.h

@@ -15,7 +15,7 @@
 #pragma link off all functions;
 
 #pragma link C++ struct o2::dcs::DataPointCompositeObject + ;
-#pragma link C++ class o2::dcs::DataPointIdentifier + ;
+#pragma link C++ struct o2::dcs::DataPointIdentifier + ;
 #pragma link C++ struct o2::dcs::DataPointValue + ;
 #pragma link C++ class o2::dcs::DCSProcessor + ;
 #pragma link C++ class std::unordered_map < o2::dcs::DataPointIdentifier, o2::dcs::DataPointValue> + ;