+AC_CACHE_CHECK([if compiler supports -Qunused-arguments],
+[libgo_cv_c_unused_arguments],
+[CFLAGS_hold=$CFLAGS
+CFLAGS="$CFLAGS -Qunused-arguments"
+AC_COMPILE_IFELSE([[int i;]],
+[libgo_cv_c_unused_arguments=yes],
+[libgo_cv_c_unused_arguments=no])
+CFLAGS=$CFLAGS_hold])
+