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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: C11 threads
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* Morten Welinder <mwelinder@gmail.com> [2014-07-25 09:42:52 -0400]:
> > the musl math library currently defines distinct long double [...]
> 
> You cannot compare a "double" function pointer to a "long double"
> function pointer.  The types are incompatible, even if they have the
> same representation.
> 
> Hence I don't believe a C program can even tell if they are the same.
> 

conversion between incompatible function pointers is allowed

and i think == should work on converted pointers too:

void f(void) {}
void g(int x) {}
int h() {return f == (void(*)(void))g;}