diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParseASTTest.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParseASTTest.java
index e7ddde25205..e24d13be73a 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParseASTTest.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParseASTTest.java
@@ -2514,5 +2514,23 @@ public class CompleteParseASTTest extends CompleteParseBaseTest
 		}
 	}
     	
+    public void testBug79810A() throws Exception {
+    	Writer writer = new StringWriter();
+    	writer.write("void foo() {\n"); //$NON-NLS-1$
+    	writer.write("int test;\n"); //$NON-NLS-1$
+    	writer.write("if ((__extension__ ({ union { int __in; int __i; } __u; __u.__in = (test); __u.__i; })) & 0x7f) {}\n}\n"); //$NON-NLS-1$
+    	parse(writer.toString());
+    	
+    	writer = new StringWriter();
+    	writer.write("#define __WTERMSIG(status) ((status) & 0x7f)\n"); //$NON-NLS-1$
+    	writer.write("#define __WIFEXITED(status) (__WTERMSIG(status) == 0)\n"); //$NON-NLS-1$
+    	writer.write("#define __WAIT_INT(status) (__extension__ ({ union { int __in; int __i; } __u; \\\n"); //$NON-NLS-1$
+    	writer.write("           __u.__in = (test); __u.__i; }))\n"); //$NON-NLS-1$
+    	writer.write("#define WIFEXITED(status)	__WIFEXITED(__WAIT_INT(status))\n"); //$NON-NLS-1$
+    	writer.write("void foo() {\n"); //$NON-NLS-1$
+    	writer.write("int test;\n"); //$NON-NLS-1$
+    	writer.write("if (WIFEXITED(test)) {}\n}\n"); //$NON-NLS-1$
+    	parse(writer.toString());
+    }
 }
 
diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParsePluginTest.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParsePluginTest.java
index 911348f1382..337c9437154 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParsePluginTest.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParsePluginTest.java
@@ -222,4 +222,53 @@ public class CompleteParsePluginTest extends FileBasePluginTest {
 	    assertEquals(foo.getName(), "foo"); //$NON-NLS-1$
 	    assertTrue(new String(foo.getFilename()).indexOf("header.h") > 0); //$NON-NLS-1$
 	}
+	
+	public void testBug79810B() throws Exception {
+    	Writer writer = new StringWriter();
+    	writer.write("#define __WTERMSIG(status) ((status) & 0x7f)\n"); //$NON-NLS-1$
+    	writer.write("#define __WIFEXITED(status) (__WTERMSIG(status) == 0)\n"); //$NON-NLS-1$
+    	writer.write("#define __WAIT_INT(status) (__extension__ ({ union { int __in; int __i; } __u; \\\n"); //$NON-NLS-1$
+    	writer.write("           __u.__in = (test); __u.__i; }))\n"); //$NON-NLS-1$
+    	writer.write("#define WIFEXITED(status)	__WIFEXITED(__WAIT_INT(status))\n"); //$NON-NLS-1$
+    	importFile( "header.h", writer.toString() ); //$NON-NLS-1$
+    	
+    	writer = new StringWriter();
+    	writer.write( "#include \"header.h\"  \n"); //$NON-NLS-1$
+    	writer.write("void foo() {\n"); //$NON-NLS-1$
+    	writer.write("int test;\n"); //$NON-NLS-1$
+    	writer.write("if (WIFEXITED(test)) {}\n}\n"); //$NON-NLS-1$
+    	IFile cpp = importFile( "test.cpp", writer.toString() ); //$NON-NLS-1$
+    	
+    	List calls = new ArrayList();
+        parse( cpp, calls );
+        
+        Iterator i = calls.iterator();
+        
+        assertEquals( i.next(), CallbackTracker.ENTER_COMPILATION_UNIT );
+        assertEquals( i.next(), CallbackTracker.ENTER_INCLUSION );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_MACRO );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_MACRO );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_MACRO );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_MACRO );
+        assertEquals( i.next(), CallbackTracker.EXIT_INCLUSION );
+        assertEquals( i.next(), CallbackTracker.ENTER_FUNCTION );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_VARIABLE );
+        assertEquals( i.next(), CallbackTracker.ENTER_CODE_BLOCK );
+        assertEquals( i.next(), CallbackTracker.ENTER_CLASS_SPEC );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_FIELD );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_FIELD );
+        assertEquals( i.next(), CallbackTracker.EXIT_CLASS );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_VARIABLE );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_REFERENCE );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_REFERENCE );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_REFERENCE );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_REFERENCE );
+        assertEquals( i.next(), CallbackTracker.ACCEPT_REFERENCE );
+        assertEquals( i.next(), CallbackTracker.EXIT_CODE_BLOCK );
+        assertEquals( i.next(), CallbackTracker.ENTER_CODE_BLOCK );
+        assertEquals( i.next(), CallbackTracker.EXIT_CODE_BLOCK );
+        assertEquals( i.next(), CallbackTracker.EXIT_FUNCTION );
+        assertEquals( i.next(), CallbackTracker.EXIT_COMPILATION_UNIT );
+        assertFalse( i.hasNext() );
+    }
 }
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/ast/complete/CompleteParseASTFactory.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/ast/complete/CompleteParseASTFactory.java
index 6420fc84aaf..8fe1efc44d0 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/ast/complete/CompleteParseASTFactory.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/ast/complete/CompleteParseASTFactory.java
@@ -1391,6 +1391,21 @@ public class CompleteParseASTFactory extends BaseASTFactory implements IASTFacto
 			rhs = rhs.getTypeSymbol().getTypeInfo();  
 		}
 
+		boolean checkInvalidConversion = true;
+		IASTExpression expLeftTest = lhsExp.getLHSExpression();
+		IASTExpression expRightTest = rhsExp.getLHSExpression();
+		while (expLeftTest != null && !(expLeftTest instanceof ASTEmptyExpression)) {
+			expLeftTest = expLeftTest.getLHSExpression();
+		} 
+		
+		while (expRightTest != null && !(expRightTest instanceof ASTEmptyExpression)) {
+			expRightTest = expRightTest.getLHSExpression();
+		} 
+		
+		if ((expLeftTest != null && expLeftTest instanceof ASTEmptyExpression) || (expRightTest != null && expRightTest instanceof ASTEmptyExpression))
+			checkInvalidConversion = false;
+		
+		if (checkInvalidConversion) {
 		// invalid arithmetic detection TODO add support for 4.5 Integral Promotions/4.7 Integral Conversions if necessary 
 		// 5.6 Multiplicative Operators: The operands of * and / shall have arithmetic or enumeration type; the operands of % shall have integral or enumeration type.
 		if (kind == IASTExpression.Kind.MULTIPLICATIVE_MULTIPLY || kind == IASTExpression.Kind.MULTIPLICATIVE_DIVIDE) {
@@ -1435,7 +1450,8 @@ public class CompleteParseASTFactory extends BaseASTFactory implements IASTFacto
 			if( !(isIntegralType(rhs, isRhsPointer) || rhs.isType(ITypeInfo.t__Bool, ITypeInfo.t_enumerator )) )
 				handleProblem( scope, IProblem.SEMANTIC_INVALID_CONVERSION_TYPE, null, rhsExp.getStartingOffset(), rhsExp.getEndingOffset(), rhsExp.getStartingLine(), true );			
 		}
-
+		} 
+		
 		ITypeInfo info = TypeInfoProvider.newTypeInfo( );
 		if( 
 		   ( lhs.checkBit(ITypeInfo.isLong)  && lhs.getType() == ITypeInfo.t_double)