https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83437
--- Comment #5 from Bernd Edlinger <bernd.edlinger at hotmail dot de> --- I think the best solution would be to use "V = void (*)(void);" I quote from Joseph Myers e-mail from 10/10/2017 because I could not express it any better: "Sometimes an interface needs to store an arbitrary function type [...] That's the sort of thing libffi does - so it inherently needs to be able to take pointers to arbitrary function types, which thus need to be converted to a generic function type, and the de facto generic function pointer type in C is void (*) (void). (C11 6.11.6 says "The use of function declarators with empty parentheses (not prototype-format parameter type declarators) is an obsolescent feature.", so void (*) () is best avoided.) Likewise interfaces such as dlsym (which happens to return void * along with a special case in POSIX requiring conversions between void * and function pointers to work, but void (*) (void) is the natural type for such interfaces to use).
