GNU Info

(m4.info)Debugging

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How to debug macros and input
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   When writing macros for `m4', most of the time they woould not work
as intended (as is the case with most programming languages).  There is
a little support for macro debugging in `m4'.

Dumpdef

Displaying macro definitions

Trace

Tracing macro calls

Debug Levels

Controlling debugging output

Debug Output

Saving debugging output