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2.4 Command line options for frozen state

GNU m4 comes with a feature of freezing internal state (see Frozen files). This can be used to speed up m4 execution when reusing a common initialization script.

-F FILE
--freeze-state=FILE
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'.
-R FILE
--reload-state=FILE
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 read.