Re: mssip.h trouble

[Ulrich Weigand]

Patrik Stridvall wrote:
> On MSVC it does matter in the following example whether n is 4 or 8.
> Or 16 for that matter eventhough that gives the same result as 8.
>
> #ifdef _MSC_VER
> typedef __int64 longlong_t;
> #else
> typedef long long longlong_t;
> #endif
>
> #pragma pack(n)
> typedef struct {
>    char x;
>    longlong_t y; /* offset is 4 if n = 4, but is 8 if n = 8 or n = 16*/
> } longlong_n;
> #pragma pack()

I would assume that MSVC and GCC use different structure
layouts even without any #pragma pack(), because the
default aligment of 8-byte data types is different.

As I mentioned in my other mail, GCC should use the same
layout as MSVC if you compile with -malign-double.

Bye,
Ulrich