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Commit 3a6402a0 authored by Matthias Maennich's avatar Matthias Maennich
Browse files

Revert "ANDROID: Revert "kheaders: make headers archive reproducible"" 



This reverts commit 35e8b5100df4b80a440c3137d57a299970135eaa.

The revert of the original commit had been partially done by merging
5.4-rc4, this is the left over piece to get back to the mainline version.

Change-Id: I9e82048210062fd7ae0eb918167e4607009487c4
Signed-off-by: default avatarMatthias Maennich <maennich@google.com>
parent feaba17c

Documentation/kbuild/reproducible-builds.rst

+9 −4
Original line number Diff line number Diff line
@@ -16,16 +16,21 @@ the kernel may be unreproducible, and how to avoid them. 
Timestamps

----------



The kernel embeds a timestamp in two places:

The kernel embeds timestamps in three places:



* The version string exposed by ``uname()`` and included in

  ``/proc/version``



* File timestamps in the embedded initramfs



By default the timestamp is the current time.  This must be overridden

using the `KBUILD_BUILD_TIMESTAMP`_ variable.  If you are building

from a git commit, you could use its commit date.

* If enabled via ``CONFIG_IKHEADERS``, file timestamps of kernel

  headers embedded in the kernel or respective module,

  exposed via ``/sys/kernel/kheaders.tar.xz``



By default the timestamp is the current time and in the case of

``kheaders`` the various files' modification times. This must

be overridden using the `KBUILD_BUILD_TIMESTAMP`_ variable.

If you are building from a git commit, you could use its commit date.



The kernel does *not* use the ``__DATE__`` and ``__TIME__`` macros,

and enables warnings if they are used.  If you incorporate external