stdarg x86_64 problems...

[Don Clugston]

On 12/07/12 11:12, John Colvin wrote:
> When I compile the following code with -m32 and -m64 i get a totally
> different result, the documentation suggests that they should be the
> same...
>
> import core.stdc.stdarg, std.stdio;
>
> void main() {
>      foo(0,5,4,3);
> }
>
> void foo(int dummy, ...) {
>      va_list ap;
>
>      for(int i; i<10; ++i) {
>          version(X86_64) {
>              va_start(ap, __va_argsave);
>          }
>          else version(X86) {
>              va_start(ap, dummy);
>          }
>          else
>              static assert(false, "Unsupported platform");
>
>          int tmp;
>          va_arg!(int)(ap,tmp);
>          writeln(ap," ", tmp);
>      }
> }
>
> when compiled with -m32 I get:
>
> FF960278 5
> FF960278 5
> FF960278 5
> FF960278 5
> FF960278 5
>
> and with -m64 I get:
>
> 7FFFCDF941D0 5
> 7FFFCDF941D0 4
> 7FFFCDF941D0 3
> 7FFFCDF941D0 38
> 7FFFCDF941D0 -839302560
>
> (the end stuff is garbage, different every time)
>
> I'm uncertain, even after looking over the stdarg src, why this would
> happen. The correct output is all 5s obviously.

Known bug, already fixed in git for a couple of months.