m4-mode
m4-mode is an interactive autoloaded compiled Lisp function in `m4-mode.el
'.
(m4-mode)
Parent mode: `prog-mode'.
A major mode to edit m4 macro files.
In addition to any hooks its parent mode `prog-mode' might have run,
this mode runs the hook `m4-mode-hook', as the final step
during initialization.
key binding
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C-c Prefix Command
C-c C-b m4-m4-buffer
C-c C-c comment-region
C-c C-r m4-m4-region