[Bug binutils/30702] objcopy and strip invalidate the effect of ld option --no-insert-timestamp

[jon.turney at dronecode dot org.uk]

https://sourceware.org/bugzilla/show_bug.cgi?id=30702

Jon Turney <jon.turney at dronecode dot org.uk> changed:

           What    |Removed                     |Added
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                 CC|                            |jon.turney at dronecode dot 
org.uk

--- Comment #3 from Jon Turney <jon.turney at dronecode dot org.uk> ---
I think for reproducible builds, we should really be doing whatever MS LINK's
/Brepro flag does, which I believe is:

* Add a IMAGE_DEBUG_TYPE_REPRO entry to the debug directory
* Use a hash value for the "timestamp"

I wrote some support for objdump to show these in [1], but skated out of the
hard work of creating them.

See https://sourceware.org/bugzilla/show_bug.cgi?id=16887 for why setting
timestamps to zero should perhaps be approached with caution.

[1] https://sourceware.org/pipermail/binutils/2020-January/109656.html

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