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Re: function reference from standard library

   Date: Tue, 13 Oct 1998 08:16:20 -0700 (PDT)
   From: Art Berggreen <art@acc.com>

   You can also use volatile on functions (I think this is a GNU extension).
   This specifies that the function will never return.

This has been deprecated, don't use it [it may not work anymore for that
matter].  Instead use __attribute__ ((__noreturn__)).

e.g.

extern void exit (int) __attribute__ ((__noreturn__));
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