GDC release 0.23

[Sean Kelly]

Anders F Björklund wrote:
> Sean Kelly wrote:
> 
>>> The double+double type has caused me no end of trouble, but I think 
>>> it is important to maintain interoperability with C.  If I make the D 
>>> 'real' implementation IEEE double, there would be no way interact 
>>> with C code that uses 'long double'.  I could add another floating 
>>> point type for this purpose, but that would diverge from the D spec 
>>> more than what I have now.
>>
>> Yeah that doesn't sound like a very attractive option.  Some of the 
>> later replies in the Darwin thread mention a compiler switch:
>>
>> http://lists.apple.com/archives/Darwin-development/2001/Jan/msg00471.html
>>
>> Is that a possibility?  Or did that switch not make it into an actual 
>> release?
> 
> There are two switches: -mlong-double-64 and -mlong-double-128,
> just that the second one ("double-double") is now the default...

Oh I see.  That thread above suggested the opposite.  Could GDC simply 
key the size of real off this switch as well then?  If the point is for 
real to map to double-double, then it must be aware of it, correct?  I 
know it's not ideal to have the size of any variable change dynamically, 
but this seems like a case where doing so may actually be desirable.


Sean