llvm 3.6 and x86 (32-bit) varargs bad stack adjust

[Kai Nacke via digitalmars-d-ldc]

On Wednesday, 15 July 2015 at 06:32:32 UTC, Dan Olson wrote:
> "Kai Nacke" <kai at redstar.de> writes:
>
>> On Monday, 13 July 2015 at 17:04:55 UTC, Dan Olson wrote:
>>> "Kai Nacke" <kai at redstar.de> writes:
>>>>
>>>> There is no ldc issue yet. Did you check with LLVM 3.7? If 
>>>> we can produce a LLVM bug report then we could try to set 
>>>> this as a release blocker. Branching for the 3.7 release is 
>>>> tomorrow.
>>>
>>> No, I have not tried 3.7 and I won't have time for a couple 
>>> days.
>>>
>>> I don't understand the history of why LDC uses X86_StdCall 
>>> for Posix. It says in LLVM docs that it is mostly used by 
>>> Win32. Perhaps it is not well tested outside Windows.  I 
>>> don't think this new Issue is a problem on Windows.
>>
>> stdcall conventions does not support variadic arguments. Or am 
>> I wrong?
>>
>> Regards,
>> Kai
>
> Yeah, I read that too.  That is why I was curious about the 
> history of using X86_StdCall.  Didn't D-style variadics changed 
> in 0.15.2 from a pointer to varags to a true variadic call.  
> Could that be related?  I decided to start looks at diffs in 
> LLVM source from 3.5 to 3.6 to see what might have happened 
> there too.  Maybe LDC is just using X86_StdCall in a "non-Std" 
> way.

Yes, that is the difference. With 0.15.1 there is no variadic 
call.
I think we must change calling convention to cdecl for variadic D 
functions.

Regards,
Kai