scons: Add warning for missing declarations

This patch enables warnings for missing declarations. To avoid issues
with SWIG-generated code, the warning is only applied to non-SWIG
code.

src/mem/ruby/buffers/MessageBuffer.hh

@@ -216,6 +216,8 @@ class MessageBuffer
     int m_vnet_id;
 };
 
+Cycles random_time();
+
 inline std::ostream&
 operator<<(std::ostream& out, const MessageBuffer& obj)
 {

src/mem/ruby/network/simple/PerfectSwitch.hh

@@ -53,6 +53,8 @@ struct LinkOrder
     int m_value;
 };
 
+bool operator<(const LinkOrder& l1, const LinkOrder& l2);
+
 class PerfectSwitch : public Consumer
 {
   public:

src/mem/ruby/profiler/AddressProfiler.hh

@@ -92,6 +92,14 @@ class AddressProfiler
     int m_num_of_sequencers;
 };
 
+AccessTraceForAddress& lookupTraceForAddress(const Address& addr,
+                                             AddressProfiler::AddressMap&
+                                             record_map);
+
+void printSorted(std::ostream& out, int num_of_sequencers,
+                 const AddressProfiler::AddressMap &record_map,
+                 std::string description);
+
 inline std::ostream&
 operator<<(std::ostream& out, const AddressProfiler& obj)
 {

src/mem/ruby/system/CacheMemory.hh

@@ -170,4 +170,6 @@ class CacheMemory : public SimObject
     bool m_resource_stalls;
 };
 
+std::ostream& operator<<(std::ostream& out, const CacheMemory& obj);
+
 #endif // __MEM_RUBY_SYSTEM_CACHEMEMORY_HH__

src/mem/ruby/system/RubyMemoryControl.hh

@@ -168,4 +168,6 @@ class RubyMemoryControl : public MemoryControl
     MemCntrlProfiler* m_profiler_ptr;
 };
 
+std::ostream& operator<<(std::ostream& out, const RubyMemoryControl& obj);
+
 #endif // __MEM_RUBY_SYSTEM_MEMORY_CONTROL_HH__

src/mem/ruby/system/WireBuffer.hh

@@ -100,4 +100,6 @@ class WireBuffer : public SimObject
 
 };
 
+std::ostream& operator<<(std::ostream& out, const WireBuffer& obj);
+
 #endif // __MEM_RUBY_SYSTEM_WireBuffer_HH__