GNU Info

(m4.info)Debug Output

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Saving debugging output
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   Debug and tracing output can be redirected to files using either the
`-o' option to `m4', or with the builtin macro `debugfile':

     debugfile(opt FILENAME)

will send all further debug and trace output to FILENAME.  If FILENAME
is empty, debug and trace output are discarded and if `debugfile' is
called without any arguments, debug and trace output are sent to the
standard error output.