[PATCH] Enable deterministic archives
ralf.corsepius at rtems.org
Tue Feb 5 16:40:02 UTC 2013
On 02/05/2013 09:00 AM, Sebastian Huber wrote:
> The GNU AR program as a 'D' option
> 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.
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.
Apart of this, this patch is incomplete, because it also activates this
stuff for non-rtems targets.
I am not going to apply this patch - May-be re-visited with
binutils-2.25 or so.
More information about the devel