conflict between libstdc++ nan and c99/builtin nan functions

[Gabriel Dos Reis]

"Kaveh R. Ghazi" <ghazi@caip.rutgers.edu> writes:

| I'm getting this warning (several times) when building libstdc++-v3:
| 
|  > libstdc++-v3/libmath/mathconf.h:84: warning: conflicting types for
|  > built-in function `nan'
| 
| mathconf.h contains:
| 
|  > #ifndef NAN
|  > # define NAN (nan())
|  > double nan (void);
|  > #endif

Now that we have built-in NaNs (thanks rth!), this hackery should just
go away.

[...]

| My question is whether libstdc++-v3 needs to provide `nan' as an
| exportable function or whether it just needs it internally.

It just used it internally (I can't recall for what exactly)

|  If it's
| just internally, perhaps I can change the NAN macro to just call
| __builtin_nan(""), otherwise I'll correct the definition in nan.c.

Well, the NAN thingy should be removed.

Thanks,

-- Gaby