C callbacks getting a value of 0! Bug in D?

[Johnson Jones via Digitalmars-d-learn]

On Tuesday, 29 August 2017 at 00:42:45 UTC, Steven Schveighoffer 
wrote:
> On 8/28/17 7:47 PM, Johnson Jones wrote:
>> [...]
>
> Then I think possibly the port audio bindings are not correct. 
> It's also possible that long is not 64-bit even on the platform 
> you are using. Finally, it's also possible that the D compiler 
> is not generating the call correctly.
>
> When I test on my mac, c_long is 8-bytes. I'm not sure what it 
> is in your case, try this code and see what happens:
>
> import core.stdc.config;
>
> pragma(msg, c_long.sizeof); // prints 8 on my box.
>
> And in c:
>
> #include <stdio.h>
>
> int main()
> {
>    printf("%lu\n", sizeof(long)); // also prints 8 on my box
>    return 0;
> }
>
> They should match. If they don't, that's a D bug (in either 
> core.stdc.config or the compiler, I'm not sure which). If they 
> do, then one of the other two possibilities is happening, and I 
> would lean towards the bindings being incorrect.
>
> -Steve

import core.stdc.config;
pragma(msg, c_long.sizeof);

prints 4UL

both on x64 and x86

and and C:

void foo()
{
	int dummy;
	switch (dummy) {
	case sizeof(long) :
	case sizeof(long) :
		break;
	}
}


produces 4 on both x86 and x64. So, I'm not sure how you are 
getting 8.