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- Reproducible builds
- ===================
- In order to achieve reproducible builds, timestamps used in the U-Boot build
- process have to be set to a fixed value.
- This is done using the SOURCE_DATE_EPOCH environment variable which specifies
- the number of seconds since 1970-01-01T00:00:00Z.
- Example
- -------
- To build the sandbox with 2023-01-01T00:00:00Z as timestamp we can use:
- .. code-block:: bash
- make sandbox_defconfig
- SOURCE_DATE_EPOCH=1672531200 make
- This date is shown when we launch U-Boot:
- .. code-block:: console
- ./u-boot -T
- U-Boot 2023.01 (Jan 01 2023 - 00:00:00 +0000)
- The same effect can be obtained with buildman using the `-r` flag.
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