core.math.rndtonl: invalid return type or description?

[ketmar via Digitalmars-d]

ag0aep6g wrote:

> On 06/19/2017 10:04 AM, ketmar wrote:
>> core.math.rndtonl is declared as this:
>> extern (C) real rndtonl(real x);
>
> Is rndtonl a Digital Mars C thing?

yes, it looks like DMC library function. thus, is should be versioned out 
on non-DMC builds. another bug. ;-)

> It has no implementation in druntime, and I get an undefined reference  
> when I try to call it on Linux.
>
> It compiles on Windows (wine, -m32), but only ever returns -nan.

> If this is the same function: 
> <http://www.digitalmars.com/rtl/fltpnt.html#rndtol>, then it should 
> return a C long, which I guess is a D int on 32 bits. And surprise: that 
> works.

no, there is `rndtol()` and `rndtonl()` in `core.math`,  they are different functions.

also, `rndtol()` should return D `long` (i.e. 64 bit value). at least this 
is what `core.math` says.