If we're using Clang add -Qunused-arguments in order to avoid a bunch

of warnings described at
http://petereisentraut.blogspot.com/2011/05/ccache-and-clang.html

svn path=/trunk/; revision=52646

CMakeLists.txt

@@ -204,8 +204,12 @@ else()
     # With clang some tests don't fail properly during testing but only
     # during real compiles
 
-    if(NOT CMAKE_C_COMPILER_ID MATCHES "Clang")
-
+    if(CMAKE_C_COMPILER_ID MATCHES "Clang")
+        set(WIRESHARK_C_FLAGS ${WIRESHARK_C_FLAGS}
+            -Qunused-arguments
+            #-fcolor-diagnostics
+        )
+    else()
         set(WIRESHARK_C_FLAGS ${WIRESHARK_C_FLAGS}
             -fexcess-precision=fast
         )

configure.ac

@@ -829,6 +829,10 @@ AC_WIRESHARK_COMPILER_FLAGS_CHECK(-Wwrite-strings)
 AC_WIRESHARK_COMPILER_FLAGS_CHECK(-Wno-long-long)
 AC_WIRESHARK_COMPILER_FLAGS_CHECK(-Wc++-compat, C)
 
+if test "x$CLANG" = "xyes" ; then
+	AC_WIRESHARK_COMPILER_FLAGS_CHECK(-Qunused-arguments)
+fi
+
 #
 # XXX - OK for C++?
 #