[Mingw-users] union cast errors?

[Ben A. <cm...@bl...>]

Hello,

Lado, thank you for the LOCALE_XX defines!

I'm still working on getting Python 2.0 to compile using MinGW32
2.95.2-1, and I came across a compiler error I can't seem to get around.
Can anybody tell me why the following doesn't work, even though the
union casts match if they're traced back far enough?

// largeinteger.c

// Distillation of important parts from longint.h
#include <windows.h>
#define _toi (__int64)
// This line (the current implementation) does not:
#define LargeIntegerAdd(a,b) (LARGE_INTEGER)( _toi(a) + _toi(b) )
// This line works by adding an explicit cast to LONGLONG:
// #define LargeIntegerAdd(a,b) (LARGE_INTEGER)((LONGLONG)(_toi(a) +
_toi(b)))
#undef _toi


void test(void)
{
 LARGE_INTEGER a, b;

 LargeIntegerAdd(a,b);
}

-------------
C:\>gcc -c -save-temps largeinteger.c
largeinteger.c: In function `test':
largeinteger.c:16: cast to union type from type not present in union

I don't understand how the largeint.h functions ever worked (maybe they
never did?), because gcc complains every time for me. The process to add
LARGE_INTEGER unions involves casting them to __int64, which is
LONGLONG, which is long long. So, it is eventually be traced back to
implicit casts to 'long long' which are added together and recast to the
LARGE_INTEGER union, which contains a LONGLONG variable type. Everything
seems to match. Any ideas?

Thanks!

Ben Allfree