--- Source/JavaScriptCore/runtime/Executable.cpp	2013-04-28 10:29:32.661800765 +0200
+++ Source/JavaScriptCore/runtime/Executable.cpp	2013-04-28 10:30:09.717607709 +0200
@@ -515,7 +515,7 @@ 
     UNUSED_PARAM(bytecodeIndex);
 #endif
     ASSERT((jitType == JITCode::bottomTierJIT()) == !m_codeBlockForCall);
-    JSObject* exception;
+    JSObject* exception = 0;
     OwnPtr<FunctionCodeBlock> newCodeBlock = produceCodeBlockFor(scopeChainNode, !!m_codeBlockForCall ? OptimizingCompilation : FirstCompilation, CodeForCall, exception);
     if (!newCodeBlock)
         return exception;
@@ -558,7 +558,7 @@ 
 #endif
     
     ASSERT((jitType == JITCode::bottomTierJIT()) == !m_codeBlockForConstruct);
-    JSObject* exception;
+    JSObject* exception = 0;
     OwnPtr<FunctionCodeBlock> newCodeBlock = produceCodeBlockFor(scopeChainNode, !!m_codeBlockForConstruct ? OptimizingCompilation : FirstCompilation, CodeForConstruct, exception);
     if (!newCodeBlock)
         return exception;
--- Source/WTF/wtf/Compiler.h	2013-04-28 10:29:34.641789776 +0200
+++ Source/WTF/wtf/Compiler.h	2013-04-28 10:31:07.477226240 +0200
@@ -122,6 +122,11 @@ 
 
 /* Specific compiler features */
 #if COMPILER(GCC) && !COMPILER(CLANG)
+
+#if GCC_VERSION_AT_LEAST(4, 8, 0)
+#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
+#endif
+
 #if GCC_VERSION_AT_LEAST(4, 7, 0) && __cplusplus >= 201103L
 #define WTF_COMPILER_SUPPORTS_CXX_RVALUE_REFERENCES 1
 #define WTF_COMPILER_SUPPORTS_CXX_DELETED_FUNCTIONS 1