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2.4 Command line options for frozen state
GNU m4
comes with a feature of freezing internal state
(see section Fast loading of frozen state). 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.
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