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6.4 Saving debugging output
===========================
Debug and tracing output can be redirected to files using either the
`--debugfile' option to `m4' ( Invoking m4), or with the builtin
macro `debugfile':
-- Builtin: debugfile ([FILE])
Sends all further debug and trace output to FILE. If FILE is
empty, debug and trace output are discarded. If `debugfile' is
called without any arguments, debug and trace output are sent to
standard error. This does not affect warnings, error messages, or
`errprint' output, which are always sent to standard error. If
FILE cannot be opened, the current debug file is unchanged.
The expansion of `debugfile' is void.
traceon(`divnum')
=>
divnum(`extra')
error-->m4:stdin:2: Warning: excess arguments to builtin `divnum' ignored
error-->m4trace: -1- divnum(`extra') -> `0'
=>0
debugfile()
=>
divnum(`extra')
error-->m4:stdin:4: Warning: excess arguments to builtin `divnum' ignored
=>0
debugfile
=>
divnum
error-->m4trace: -1- divnum -> `0'
=>0
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