__sync* are GCC/Clang atomic builtins supported on any platform

In file included from Source/GmmLib/Platform/GmmGen11Platform.cpp:23:
In file included from Source/GmmLib/inc/Internal/Common/GmmLibInc.h:35:
In file included from Source/GmmLib/inc/External/Common/GmmCachePolicy.h:332:
Source/GmmLib/inc/External/Common/GmmCachePolicyCommon.h:74:13: error: control reaches end of non-void function [-Werror,-Wreturn-type]
            }
            ^

Source/GmmLib/GlobalInfo/GmmInfo.cpp:600:1: error: non-void function does not return a value in all control paths [-Werror,-Wreturn-type]
}
^
Source/GmmLib/GlobalInfo/GmmInfo.cpp:635:5: error: expected 'while' in do/while loop
    else
    ^
Source/GmmLib/GlobalInfo/GmmInfo.cpp:616:9: note: to match this 'do'
        do
        ^
Source/GmmLib/GlobalInfo/GmmInfo.cpp:803:18: error: qualified reference to 'Context' is a constructor name rather than a type in this context
GmmLib::Context::Context()
                 ^
Source/GmmLib/GlobalInfo/GmmInfo.cpp:804:5: error: expected ';' after expression
    : ClientType(),
    ^
[...]

Author: jbeich

Source/GmmLib/GlobalInfo/GmmInfo.cpp

@@ -756,7 +756,7 @@ int32_t GMM_STDCALL GmmLib::GmmMultiAdapterContext::IncrementRefCount(ADAPTER_BD
     {
         int32_t *Ref = &pNode->RefCount;
 
-#if defined(__linux__)
+#if defined(__GNUC__)
         // returns 0 only when registering the first client
         return (__sync_fetch_and_add(Ref, 1));
 #endif
@@ -802,7 +802,7 @@ int32_t GMM_STDCALL GmmLib::GmmMultiAdapterContext::DecrementRefCount(ADAPTER_BD
             }
 #if defined(_WIN32)
         } while(!(InterlockedCompareExchange((LONG *)Ref, TargetValue, CurrentValue) == CurrentValue));
-#elif defined(__linux__) 
+#elif defined(__GNUC__)
         } while(!__sync_bool_compare_and_swap(Ref, CurrentValue, TargetValue));
 #endif
 

Source/GmmLib/inc/External/Common/GmmInfo.h

@@ -128,7 +128,7 @@ namespace GmmLib
         {
 #if defined(_WIN32)
             return(InterlockedIncrement((LONG *)&RefCount) - 1);  //InterLockedIncrement() returns incremented value
-#elif defined(__linux__)
+#elif defined(__GNUC__)
             return(__sync_fetch_and_add(&RefCount, 1));
 #endif
         }
@@ -150,7 +150,7 @@ namespace GmmLib
                 }
 #if defined(_WIN32)
             } while (!(InterlockedCompareExchange((LONG *)&RefCount, TargetValue, CurrentValue) == CurrentValue));
-#elif defined(__linux__)
+#elif defined(__GNUC__)
             } while (!__sync_bool_compare_and_swap(&RefCount, CurrentValue, TargetValue));
 #endif