Function: global-flycheck-mode

Toggle Flycheck mode in all buffers.
With prefix ARG, enable Global-Flycheck mode if ARG is positive;
otherwise, disable it. If called from Lisp, enable the mode if
ARG is omitted or nil.

Flycheck mode is enabled in all buffers where
`flycheck-mode-on-safe' would do it.
See `flycheck-mode' for more information on Flycheck mode. (fn &optional ARG)

Variable: global-flycheck-mode

Non-nil if Global-Flycheck mode is enabled.
See the command `global-flycheck-mode' for a description of this minor mode.
Setting this variable directly does not take effect;
either customize it (see the info node `Easy Customization')
or call the function `global-flycheck-mode'.