[PATCH] Enable deterministic archives

[Gedare Bloom]

On Tue, Feb 5, 2013 at 11:40 AM, Ralf Corsepius
<ralf.corsepius at rtems.org> wrote:
> On 02/05/2013 09:00 AM, Sebastian Huber wrote:
>>
>> The GNU AR program as a 'D' option
>> (http://sourceware.org/binutils/docs/binutils/ar-cmdline.html#ar-cmdline):
>>
>> [...]
>> `D'
>>      Operate in deterministic mode. When adding files and the archive
>> index use zero for UIDs, GIDs, timestamps, and use consistent file modes
>> for all files. When this option is used, if ar is used with identical
>> options and identical input files, multiple runs will create identical
>> output files regardless of the input files' owners, groups, file modes,
>> or modification times.
>>
>>      If binutils was configured with --enable-deterministic-archives,
>> then this mode is on by default. It can be disabled with the `U'
>> modifier, below.
>> [...]
>>
>> This helps to avoid artificial differences in archives and thus makes it
>> easier to use version control for archives (e.g. static libraries).
>
>
> This introduces a gnu-binutils proprietary/non-portable feature into
> gnu-binutils. It definitely adds artifical contraints to gnu-ar and
> activates a bleeding-edge feature, whose downsides are not yet known.
>
We should introduce and test it now rather than later. Unless we are
close to cutting a new release, which I haven't heard anything.

> That said, I feel this change is overzealous and based on the very specific
> demands of a very small circle. Making RTEMS relying upon it at the moment
> seems premature to me.
>
RTEMS is driven by demands of small circles.

> Apart of this, this patch is incomplete, because it also activates this
> stuff for non-rtems targets.
>
What do you mean "non-rtems targets"? It looks like this just enables
use of a flag available in binutils while generating rtems' binutils.
Did I miss something?

I don't see the problem here.

> I am not going to apply this patch - May-be re-visited with binutils-2.25 or
> so.
>
> Ralf
>
>
>
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