The configuration is passed through cpp for file inclusion and macro substitution. C or C++ comments are removed by cpp.
Examples:
// this is a comment
/* and, of
course, this
too */
Language tokens can be separated by whitespace, which may include newlines, i.e. the usual formatting rules of C or Perl apply.
In all cases where a string is expected, one can use a string in double quotes or a string variable.
Examples:
host "localhost" /* quoted string */ host "ftp.kernel.org" /* another quoted string */ host $var /* variable */