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bfb708ad99
This is quite a useful thing to use when building since it avoids small size changes between commits. Add a -r flag for it. Also undefine CONFIG_LOCALVERSION_AUTO since this appends the git hash to the version string, causing every build to be slightly different. Signed-off-by: Simon Glass <sjg@chromium.org>
28 lines
669 B
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28 lines
669 B
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Reproducible builds
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===================
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In order to achieve reproducible builds, timestamps used in the U-Boot build
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process have to be set to a fixed value.
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This is done using the SOURCE_DATE_EPOCH environment variable which specifies
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the number of seconds since 1970-01-01T00:00:00Z.
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Example
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-------
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To build the sandbox with 2023-01-01T00:00:00Z as timestamp we can use:
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.. code-block:: bash
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make sandbox_defconfig
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SOURCE_DATE_EPOCH=1672531200 make
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This date is shown when we launch U-Boot:
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.. code-block:: console
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./u-boot -T
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U-Boot 2023.01 (Jan 01 2023 - 00:00:00 +0000)
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The same effect can be obtained with buildman using the `-r` flag.
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