Ignore "warning: argument unused during compilation" in cc-build on clang

git-svn-id: file:///git/lcgcool.svndb/cool/trunk@19920 4525493e-7705-40b1-a816-d608a930855b

cc-build

@@ -110,7 +110,11 @@ if [ "${out#logs/}" != "$out" ]; then
     echo "No build warnings found"
   else
     echo "WARNING! Build warnings found!"
-    grep warning $out
+    grep warning $out | grep -v "warning: argument unused during compilation"
+    grep "warning: argument unused during compilation" $out > /dev/null 2>&1 
+    if [ "$?" == "0" ]; then
+      echo "[Omitted all occurrences of 'warning: argument unused during compilation']"
+    fi
   fi
 fi