__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]
            }
            ^
In file included from Source/GmmLib/Platform/GmmGen11Platform.cpp:23:
In file included from Source/GmmLib/inc/Internal/Common/GmmLibInc.h:38:
Source/GmmLib/inc/../Platform/GmmPlatforms.h:86:9: error: control reaches end of non-void function [-Werror,-Wreturn-type]
        }
        ^
In file included from Source/GmmLib/Platform/GmmGen11Platform.cpp:23:
In file included from Source/GmmLib/inc/Internal/Common/GmmLibInc.h:42:
In file included from Source/GmmLib/inc/../Texture/GmmTexture.h:27:
In file included from Source/GmmLib/inc/External/Common/GmmInfoExt.h:25:
Source/GmmLib/inc/External/Common/GmmInfo.h:134:9: error: control reaches end of non-void function [-Werror,-Wreturn-type]
        }
        ^
In file included from Source/GmmLib/CachePolicy/GmmGen11CachePolicy.cpp:23:
In file included from Source/GmmLib/inc/Internal/Common/GmmLibInc.h:42:
In file included from Source/GmmLib/inc/../Texture/GmmTexture.h:31:
Source/GmmLib/inc/Internal/Common/Texture/GmmTextureCalc.h:163:13: error: control reaches end of non-void function [-Werror,-Wreturn-type]
            }
            ^

Author: jbeich

Source/GmmLib/Platform/GmmPlatforms.h

@@ -86,7 +86,7 @@ namespace GmmLib {
         {
 #if defined(__GMM_KMD__) || _WIN32
             InterlockedIncrement((LONG *)&RefCount);
-#elif defined(__linux__)
+#elif defined(__GNUC__)
             __sync_fetch_and_add(&RefCount, 1);
 #endif
             //TODO[Android]
@@ -96,7 +96,7 @@ namespace GmmLib {
         {
 #if defined(__GMM_KMD__) || _WIN32
             return(InterlockedDecrement((LONG *)&RefCount));
-#elif defined(__linux__)
+#elif defined(__GNUC__)
             return(__sync_sub_and_fetch(&RefCount, 1));
 #endif
             //TODO[Android]

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

@@ -58,7 +58,7 @@ namespace GmmLib
             {
                 #if defined(__GMM_KMD__) || _WIN32
                     InterlockedIncrement((LONG *)&RefCount);
-                #elif defined(__linux__)
+                #elif defined(__GNUC__)
                     __sync_fetch_and_add(&RefCount, 1);
                 #endif
                 //TODO[Android]
@@ -68,7 +68,7 @@ namespace GmmLib
             {
                 #if defined(__GMM_KMD__) || _WIN32
                     return(InterlockedDecrement((LONG *)&RefCount));
-                #elif defined(__linux__)
+                #elif defined(__GNUC__)
                     return(__sync_sub_and_fetch(&RefCount, 1));
                 #endif
                 //TODO[Android]

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

@@ -127,7 +127,7 @@ 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
         }
@@ -149,7 +149,7 @@ 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
 

Source/GmmLib/inc/Internal/Common/Texture/GmmTextureCalc.h

@@ -176,7 +176,7 @@ namespace GmmLib
             {
                 #if defined(__GMM_KMD__) || _WIN32
                     InterlockedIncrement((LONG *)&RefCount);
-                #elif defined(__linux__)
+                #elif defined(__GNUC__)
                     __sync_fetch_and_add(&RefCount, 1);
                 #endif
                     //TODO[Android]
@@ -186,7 +186,7 @@ namespace GmmLib
             {
                 #if defined(__GMM_KMD__) || _WIN32
                     return(InterlockedDecrement((LONG *)&RefCount));
-                #elif defined(__linux__)
+                #elif defined(__GNUC__)
                     return(__sync_sub_and_fetch(&RefCount, 1));
                 #endif
                     //TODO[Android]