batch-byte-recompile-directory is an autoloaded compiled Lisp function in `
(batch-byte-recompile-directory &optional ARG)
Run `byte-recompile-directory' on the dirs remaining on the command line.
Must be used only with `-batch', and kills Emacs on completion.
For example, invoke `emacs -batch -f batch-byte-recompile-directory .'.
Optional argument ARG is passed as second argument ARG to
`byte-recompile-directory'; see there for its possible values
and corresponding effects.