Given the lack of feedback, I'm sending a sample scenario and
results:
union Foo
{
struct
{
void* v;
int i;
}
double d;
}
static assert(Foo.sizeof == 8);
void copy(Foo* a, Foo* b)
{
version(one)
{
a.v = b.v;
a.i = b.i;
}
version(two)
{
a.d = b.d;
}
}
void main()
{
Foo a;
Foo b;
b.i = 0x7ff7a502;
copy(&a, &b);
writef("%x\n", a.i);
writeln(a.d);
}
Linux (32-bits):
$ dmd -version=one test.d && ./test
7ff7a502
nan
$ dmd -version=two test.d && ./test
7fffa502 <-- different
nan
OS X (64-bits, binary forced to 32-bits):
$ dmd -m32 -version=one test.d && ./test
7ff7a502
nan
$ dmd -m32 -version=two test.d && ./test
7ff7a502 <-- equal
nan
