Compiling to 68K processor (Maybe GDC?)

[Patrick Schluter]

On Saturday, 19 January 2019 at 12:54:28 UTC, rikki cattermole 
wrote:
> On 20/01/2019 1:38 AM, Edgar Vivar wrote:
>> Hi,
>> 
>> I have a project aiming to old 68K processor. While I don't 
>> think DMD would be able for this on the other hand I think GDC 
>> can, am I right?
>> 
>> If yes would be any restriction of features to be used? Or the 
>> compiler would be smart enough to handle this properly?
>> 
>> Edgar V.
>
> Potentially.
>
> D is designed to only work on 32bit+ architectures. The 68k 
> series did have 32bit versions of them.
>
> After a quick check it does look like LDC is out as LLVM has 
> not yet got support for M68k target. Which is unfortunate 
> because with the -betterC flag it could have pretty much out of 
> the box worked. Even if you don't have most of D at your 
> disposal e.g. classes and GC (but hey old cpu! can't expect 
> that).
>
> I have no idea about GDC, but the -betterC flag is pretty 
> recent so its support may not be what you would consider first 
> class there yet.

At least 68030 (or 68020+68851) would be necessary for proper 
segfault managing (MMU) and an OS that uses it. Afaict NULL 
pointer derefernecing must fault for D to be "usable". At least 
all code is written with that assumption.