Re: [PATCH 01/27] [AARCH64] Fix utmp struct for compatibility reasons.

[Yury Norov]

On Tue, Jun 21, 2016 at 11:14:54AM +0100, Szabolcs Nagy wrote:
> On 21/06/16 06:06, Yury Norov wrote:
> > From: Andrew Pinski <apinski@xxxxxxxxxx>
> > 
> > NOTE This is an ABI change for AARCH64.
> > If you have some AARCH32 and AARCH64 applications and they both use
> > utmp, one of them will fail due to the use of time_t inside the
> > utmp binary format.
> > 
> > This fixes the problem by setting __WORDSIZE_TIME64_COMPAT32.
> 
> i think changing the abi now is not ok.
> 
> this is BZ 17470 and i think it should be discussed separately
> from ilp32.
> 
> if it's possible to detect the utmp file format, that would
> allow a reasonable fix, the way glibc changes the struct def
> based on lp64 targets is non-conforming.

Hi Joseph, Szabolcs,

I revised it and found that we don't need __WORDSIZE_TIME64_COMPAT32
because ilp32 already has 32-bit time_t.
So for now sysdeps/aarch64/bits/wordsize.h is looking like this:
        #ifdef __LP64__
        # define __WORDSIZE                    64
        #else
        # define __WORDSIZE                    32
        # define __WORDSIZE32_SIZE_ULONG       1
        # define __WORDSIZE32_PTRDIFF_LONG     1
        #endif

is it OK? Andrew?