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GNU macro processor

7.3 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