diff --git a/libsrc/core/archive.hpp b/libsrc/core/archive.hpp
index d56e3f7f..3bab01f3 100644
--- a/libsrc/core/archive.hpp
+++ b/libsrc/core/archive.hpp
@@ -947,9 +947,9 @@ namespace ngcore
     template<typename T>
       Archive& ApplyHash(T val)
     {
-      auto n = sizeof(T);
+      size_t n = sizeof(T);
       char* pval = (char*)&val;
-      for(int i = 0; i < n; i++)
+      for(size_t i = 0; i < n; i++)
         {
           h[offset++] ^= pval[i];
           offset %= 8;
diff --git a/libsrc/core/array.hpp b/libsrc/core/array.hpp
index 752f6f64..d47e4b78 100644
--- a/libsrc/core/array.hpp
+++ b/libsrc/core/array.hpp
@@ -40,7 +40,7 @@ namespace ngcore
   };
 
   template <typename ... ARGS>
-  ostream & operator<< (ostream & ost, Tuple<ARGS...> tup)
+  ostream & operator<< (ostream & ost, Tuple<ARGS...> /* tup */)
   {
     return ost;
   }
@@ -1227,7 +1227,7 @@ namespace ngcore
 
 
   template <typename ... ARGS>
-  size_t ArraySize (Tuple<ARGS...> tup)  
+  size_t ArraySize (Tuple<ARGS...> /* tup */)  
   { return 0;}
   
   template <typename ... ARGS>
@@ -1240,7 +1240,7 @@ namespace ngcore
 
   
   template <typename T, typename ... ARGS>
-  void StoreToArray (FlatArray<T> a, Tuple<ARGS...> tup) { ; }
+  void StoreToArray (FlatArray<T> /* a */, Tuple<ARGS...> /* tup */) { ; }
   
   template <typename T, typename ... ARGS>
   void StoreToArray (FlatArray<T> a, Tuple<int,ARGS...> tup)
diff --git a/libsrc/core/localheap.hpp b/libsrc/core/localheap.hpp
index 75de3c87..bc295e79 100644
--- a/libsrc/core/localheap.hpp
+++ b/libsrc/core/localheap.hpp
@@ -198,9 +198,9 @@ public:
       return reinterpret_cast<T*> (oldp);
     }
 
-    virtual void Delete(void* p) {}
+  virtual void Delete(void* /* p */) {}
 
-    virtual void ArrayDelete(void* p) {}
+  virtual void ArrayDelete(void* /* p */) {}
   private: 
     ///
 #ifndef __CUDA_ARCH__
@@ -211,7 +211,7 @@ public:
 
   public:
     /// free memory (dummy function)
-    NETGEN_INLINE void Free (void * data) throw () 
+  NETGEN_INLINE void Free (void * /* data */) throw () 
     {
       ;
     }
diff --git a/libsrc/core/profiler.hpp b/libsrc/core/profiler.hpp
index 208b7a4e..d49b6543 100644
--- a/libsrc/core/profiler.hpp
+++ b/libsrc/core/profiler.hpp
@@ -438,21 +438,21 @@ namespace ngcore
 #else // NETGEN_TRACE_MEMORY
   public:
     MemoryTracer() {}
-    MemoryTracer( std::string name ) {}
+    MemoryTracer( std::string /* name */ ) {}
     template <typename... TRest>
-    MemoryTracer( std::string name, TRest & ... ) {}
+    MemoryTracer( std::string /* name */, TRest & ... ) {}
 
-    void Alloc(size_t size) const {}
-    void Free(size_t size) const {}
+    void Alloc(size_t /* size */) const {}
+    void Free(size_t /* size */) const {}
     void Swap(...) const {}
     int GetId() const { return 0; }
 
     template <typename... TRest>
     void Track(TRest&...) const {}
 
-    static std::string GetName(int id) { return ""; }
+    static std::string GetName(int /* id */) { return ""; }
     std::string GetName() const { return ""; }
-    void SetName(std::string name) const {}
+    void SetName(std::string /* name */) const {}
 #endif // NETGEN_TRACE_MEMORY
   };
 } // namespace ngcore
diff --git a/libsrc/core/table.hpp b/libsrc/core/table.hpp
index 7471b6a3..34f40c93 100644
--- a/libsrc/core/table.hpp
+++ b/libsrc/core/table.hpp
@@ -192,7 +192,7 @@ namespace ngcore
 
     using FlatTable<T,IndexType>::operator[];
 
-    NETGEN_INLINE void StartMemoryTracing (int mem_id)
+    NETGEN_INLINE void StartMemoryTracing (int /* mem_id */)
     {
       mt.Alloc(GetMemUsage());
     }
diff --git a/libsrc/core/taskmanager.hpp b/libsrc/core/taskmanager.hpp
index d9239be9..7025ce3d 100644
--- a/libsrc/core/taskmanager.hpp
+++ b/libsrc/core/taskmanager.hpp
@@ -1068,11 +1068,11 @@ public:
   {
     static Timer timer("ComputeColoring - "+Demangle(typeid(Tmask).name())); RegionTimer rt(timer);
     static_assert(sizeof(unsigned int)==4, "Adapt type of mask array");
-    auto n = colors.Size();
+    size_t n = colors.Size();
 
     Array<unsigned int> mask(ndofs);
 
-    int colored_blocks = 0;
+    size_t colored_blocks = 0;
 
     // We are coloring with 32 colors at once and use each bit to mask conflicts
     unsigned int check = 0;
diff --git a/libsrc/core/xbool.hpp b/libsrc/core/xbool.hpp
index 2063ebf7..fd0da95e 100644
--- a/libsrc/core/xbool.hpp
+++ b/libsrc/core/xbool.hpp
@@ -20,12 +20,12 @@ namespace ngcore
 
   public:
     xbool (bool b) : state(b ? 2 : 0) { ; }
-    xbool (TMAYBE x) : state(1) { ; }
+    xbool (TMAYBE /* x */) : state(1) { ; }
     xbool () = default;
     xbool (const xbool &) = default;
     
     xbool & operator= (bool b) { state = b ? 2 : 0; return *this; }
-    xbool & operator= (TMAYBE x) { state = 1; return *this; }
+    xbool & operator= (TMAYBE /* x */) { state = 1; return *this; }
     
     bool IsTrue () const { return state == 2; }
     bool IsMaybe () const { return state == 1; }