(m4.info)Debugging

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7 How to debug macros and input
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When writing macros for 'm4', they often do not work as intended on the
first try (as is the case with most programming languages).
Fortunately, there is support for macro debugging in 'm4'.

Dumpdef

Displaying macro definitions

Trace

Tracing macro calls

Debug Levels

Controlling debugging output

Debug Output

Saving debugging output