Different struct sizeof between linux and windows

[Andre Pany via Digitalmars-d-learn]

Hi,

I try to write a wrapper for a library. I translated the C++ 
header coding.
While the wrapper is working fine in linux, on windows the 
library complains
the struct size is too small while calling it.
This is the reduced example:
import core.stdc.time: time_t;
import std.stdio;
        
enum Bar
{
        UNDEFINED = 0,
}
        
struct Foo1
{
   Bar bar;
}
        
struct Foo2
{
   time_t issuedAt;
   Bar bar;
}
        
struct Foo3
{
   time_t issuedAt;
}

void main()     
{
        writeln(Foo1.sizeof);
        writeln(Foo2.sizeof);
        writeln(Foo3.sizeof);
}


I compile the application using dub --arch=x86_64 on windows and
just dub on linux.

Results on linux:
4
16
8

Results on windows:
4
8
4

Is this behavior correct?

Kind regards
André