dnl @ ../doc/m4.texi:2717: Origin of test dnl @ expected status: 0 dnl @ extra options: dnl @ Copyright (C) 2006, 2007, 2008, 2009 Free Software dnl @ Foundation, Inc. dnl @ This file is free software; the Free Software Foundation dnl @ gives unlimited permission to copy and/or distribute it dnl @ with or without modifications, as long as this notice dnl @ is preserved. ifdef(`foo', ``foo' is defined', ``foo' is not defined') dnl @result{}foo is not defined define(`foo', `') dnl @result{} ifdef(`foo', ``foo' is defined', ``foo' is not defined') dnl @result{}foo is defined ifdef(`no_such_macro', `yes', `no', `extra argument') dnl @error{}m4:stdin:4: Warning: excess arguments to builtin `ifdef' ignored dnl @result{}no