[PATCH v2] Xmd.h: Treat __ILP32__ targets as LONG32 ones

Lu, Hongjiu hongjiu.lu at intel.com
Sun Jun 10 11:04:26 PDT 2012

> On 06/10/12 09:22 AM, Lu, Hongjiu wrote:
> > We are proposing to extend x86-64 psABI to support
> > ILP32 model:
> >
> > http://gcc.gnu.org/ml/gcc/2012-05/msg00258.html
> >
> > If a software package needs update to support ILP32
> > in x86-64, __ILP32__ can used to distinguish LP64 model
> > from ILP32 model.  If there are no differences
> > between ILP32 and LP64 models, no changes are needed.  If
> > an x86-64 compiler doesn't support ILP32 model, checking
> > __ILP32__ will make sure that it will works.
> If the software didn't care about the ABI, they wouldn't check for
> __amd64__ in the first place.   This is a compatibility breaking
> change that should not be allowed.   Define a new __x32__ symbol,
> don't break __amd64__.

If a package doesn't support x32, it won't work on x32
anyway. Please show me one example of adding __ILP32__ check
breaks anything.


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