(m4.info.gz) Changecom

 
 Changing comment delimiters
 ===========================
 
    The default comment delimiters can be changed with the builtin macro
 `changecom':
 
      changecom(opt START, opt END)
 
 where START is the new start-comment delimiter and END is the new
 end-comment delimiter.  If any of the arguments are void, the default
 comment delimiters (`#' and newline) are used instead of the void
 arguments.  The comment delimiters can be of any length.
 
    The expansion of `changecom' is void.
 
      define(`comment', `COMMENT')
      =>
      # A normal comment
      =># A normal comment
      changecom(`/*', `*/')
      =>
      # Not a comment anymore
      =># Not a COMMENT anymore
      But: /* this is a comment now */ while this is not a comment
      =>But: /* this is a comment now */ while this is not a COMMENT
 
    Note how comments are copied to the output, much as if they were
 quoted strings.  If you want the text inside a comment expanded, quote
 the start comment delimiter.
 
    Calling `changecom' without any arguments disables the commenting
 mechanism completely.
 
      define(`comment', `COMMENT')
      =>
      changecom
      =>
      # Not a comment anymore
      =># Not a COMMENT anymore

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