[jmgao]

There's an optimization that targets specifically this case: identical code folding. It's not safe in general, because the standard requires that the different versions must have different addresses, but if the compiler can prove that at least one of the functions doesn't have its address taken (or if the user passes in a flag saying "no, I don't care about that bit of the standard"), they can be merged.

[leni536]

Isn't it trivial to satisfy the standard by making one of the functions to use a trivial indirection? Or just prepend the function body with a nop and one of the functions point there.

I am curious which part of the standard specifically disallows aliasing function pointers though. I guess it's only a problem for static member functions that have the same signature for both instantiations, since only these can have the same type.

Edit: Actually is it the opposite? Aliasing is allowed for pointers of the same type, the problem would be the aliasing of function pointers of different type. Then again, I think the nop solution should work.