NetBSD amd64: which way is the best for supporting 80 bits real/double?

[Nikolay via Digitalmars-d]

I am porting LDC to NetBSD amd64, and I ask advice how to handle 
real type. NetBSD has limited support for this type. This type 
exists, but standard library does not provide full set of math 
functions for it (e.g. sinus, cosinus, and etc). Currently I just 
forward all function calls to 64 bits version counterparts, but 
in this case a set of unit tests are failing. I see following 
approaches to handle this issue:
   - Totally remove 80 bit real type from NetBSD port (make 
real==double)
   - Change tests and skip asserts for NetBSD
There is one additional approach: implement these functions in 
druntime, but it is too big/massive work for me.