fixed a few conflicts of size_t and uint64_t on mac

source/adios2/ADIOS.inl

@@ -24,7 +24,7 @@ VariableCompound &ADIOS::DefineVariableCompound(const std::string &name,
     CheckVariableInput(name, dimensions);
     const unsigned int size = m_Compound.size();
     m_Compound.emplace(size, VariableCompound(name, sizeof(T), dimensions,
-                                              globalDimensions, globalOffsets,
+                                              globalDimensions, globalOffsets, false,
                                               m_DebugMode));
     m_Variables.emplace(name, std::make_pair(GetType<T>(), size));
     return m_Compound.at(size);

source/adios2/core/Engine.cpp

@@ -224,6 +224,7 @@ Variable<unsigned int> *
 Engine::InquireVariableUInt(const std::string & /*name*/, const bool /*readIn*/)
 {
     EngineThrowUp(m_EngineType, "InquireVariableUInt");
+    return nullptr;
 }
 Variable<long int> *Engine::InquireVariableLInt(const std::string & /*name*/,
                                                 const bool /*readIn*/)

source/adios2/core/VariableBase.h

@@ -155,8 +155,10 @@ public:
                 "Variable.SetSelection() for local or joined array '" + m_Name +
                 "' should pass an empty 'start' argument\n");
         }
-        ConvertUint64VectorToSizetVector(count, m_Count);
-        ConvertUint64VectorToSizetVector(start, m_Start);
+//        ConvertUint64VectorToSizetVector(count, m_Count);
+//        ConvertUint64VectorToSizetVector(start, m_Start);
+        m_Count = count;
+        m_Start = start;
     }
 
     /**
@@ -165,7 +167,10 @@ public:
      */
     void SetSelection(const SelectionBoundingBox &sel)
     {
-        SetSelection(sel.m_Start, sel.m_Count);
+        Dims start, count;
+        ConvertUint64VectorToSizetVector(sel.m_Start, start);
+        ConvertUint64VectorToSizetVector(sel.m_Count, count);
+        SetSelection(start, count);
     }
 
     /**