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List:       koffice-devel
Subject:    Re: Portable Code (am I dreaming? :))
From:       Clarence Dang <CTRL_CD () bigpond ! com>
Date:       2002-01-24 11:35:29
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On Thu, 24 Jan 2002 08:53, shaheed wrote:
> Nicolas,
>
> > > 1. Write all your code in terms of Q_{U,}INT{8,16,32} to maximise
> > > portability on all Qt supported platforms. In your header file, do
> > > something like this:
> > >
> > > #ifndef Q_UINT8
> > >
> > > ...as many platform-specific defs enclose in platform #ifdef guards
> > >
> > > #endif
> > >
> > > to maximise portability on non Qt supported platforms. Or vice versa.
> >
> > I do not think that you need it.
> >
> > The MS Write import filter does define its base types (BYTE, WORD,
> > DWORD...) correctly (apart perhaps from the comment I made about
> > signess).
>
> No, the mswrite filter does it *wrong* for DWORD on any modern 64 bit
> machine. Basically, most 32 bit machines (e.g. "modern" x86) uses the
> so-called "ILP32" model where Integers Longs and Pointers are all 32 bit.
> However, AFAIK, all the major 64 bit platforms use "LP64" (once you get
> over the crappy transitional compiler environments that certain Unixes used
> to "help" application porters migrate) so that where mswritelib.h says:
>
> typedef signed long DWORD;                      // 4 bytes
>
> it will break on Digital UNIX, Solaris 8 and Irix in their 64 bit clean
> compilation environments. Note that these have always been, or are
> becoming, the defaults for those platforms. I suspect, but don't have
> proof, that Qt is more likely to get this right on a range of platforms
> than me, for example
>
> :-), and I was taking the liberty of extrapolating to others too!
>
I thought that in a 16-bit environment, int=short (16 bits) and
in a 32-bit environment, int=long (32bits).  This is purely from observation however.
How big are short and long in 64bit?

Thanks!
Clarence
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