2.4 Command line options for frozen state
GNU `m4' comes with a feature of freezing internal state (Note: Frozen
files). This can be used to speed up `m4' execution when reusing a
common initialization script.
Once execution is finished, write out the frozen state on the
specified FILE. It is conventional, but not required, for FILE to
end in `.m4f'.
Before execution starts, recover the internal state from the
specified frozen FILE. The options `-D', `-U', and `-t' take
effect after state is reloaded, but before the input files are
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