diff --git a/SPIRV/spvIR.h b/SPIRV/spvIR.h
index 087a53f2..6880595e 100755
--- a/SPIRV/spvIR.h
+++ b/SPIRV/spvIR.h
@@ -65,6 +65,14 @@ const Id NoResult = 0;
 const Id NoType = 0;
 
 const Decoration NoPrecision = DecorationMax;
+
+#ifdef __GNUC__
+#   define POTENTIALLY_UNUSED __attribute__((unused))
+#else
+#   define POTENTIALLY_UNUSED
+#endif
+
+POTENTIALLY_UNUSED
 const MemorySemanticsMask MemorySemanticsAllMemory =
                 (MemorySemanticsMask)(MemorySemanticsSequentiallyConsistentMask |
                                       MemorySemanticsUniformMemoryMask |
diff --git a/glslang/MachineIndependent/iomapper.cpp b/glslang/MachineIndependent/iomapper.cpp
index 59db1ade..1758d00a 100644
--- a/glslang/MachineIndependent/iomapper.cpp
+++ b/glslang/MachineIndependent/iomapper.cpp
@@ -416,7 +416,7 @@ struct TDefaultIoResolverBase : public glslang::TIoMapResolver
 
         return 0;
     }
-    int resolveUniformLocation(EShLanguage /*stage*/, const char* /*name*/, const glslang::TType& type, bool is_live) override
+    int resolveUniformLocation(EShLanguage /*stage*/, const char* /*name*/, const glslang::TType& type, bool /*is_live*/) override
     {
         // kick out of not doing this
         if (!doAutoLocationMapping)