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Makefile: release: make manual build reproducible

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The manual contains build timestamps like:

Buildroot 2025.08-rc1 manual generated on 2025-08-12 06:43:37 UTC

Making it not reproducible.  Luckily asciidoc respects SOURCE_DATE_EPOCH, so
use that to use the timestamp of the latest git commit instead.

Notice: The release and manual targets are marked as noconfig targets (and
need to stay like that for make release), so we cannot use the
BR2_REPRODUCIBLE logic.  Instead manually set SOURCE_DATE_EPOCH.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit 3fc5d821eb)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>
This commit is contained in:
Peter Korsgaard
2025-08-12 09:36:43 +02:00
committed by Thomas Perale
parent 9fa033bb1d
commit f1745c0482
1 changed files with 2 additions and 1 deletions
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Makefile
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@@ -1250,7 +1250,8 @@ release: OUT = buildroot-$(BR2_VERSION)
# documentation to the git output
release:
git archive --format=tar --prefix=$(OUT)/ HEAD > $(OUT).tar
$(MAKE) O=$(OUT) manual-html manual-text manual-pdf
SOURCE_DATE_EPOCH=$$(git log -1 --format=%at 2> /dev/null) \
$(MAKE) O=$(OUT) manual-html manual-text manual-pdf
$(MAKE) O=$(OUT) distclean
tar rf $(OUT).tar $(OUT)
gzip -9 -c < $(OUT).tar > $(OUT).tar.gz