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Makefile: add '-n' to gzip invocations to improve reproducibility

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Default invocation to gzip include timestamp in output file. This feature is
incompatible with BR2_REPRODUCIBLE. It is possible to disable it with '-n'.

The environment variable GZIP can hold a set of default options for gzip. So
instead to find all gzip invocation in build process, we just export 'GZIP=-n'.

Notice bzip2, lzma and xz are not impacted by this problem. On the other hand, lzop
does include timestamp and does not provide any way to disable it.

This work was sponsored by `BA Robotic Systems'.

Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Jérôme Pouiller 2016-11-23 13:58:42 +01:00 committed by Thomas Petazzoni
parent 9befe94baf
commit 9b91b21dae
1 changed files with 1 additions and 0 deletions
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Makefile
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@ -251,6 +251,7 @@ ifeq ($(BR2_REPRODUCIBLE),y)
export TZ=UTC
export LANG=C
export LC_ALL=C
export GZIP = -n
BR2_VERSION_GIT_EPOCH = $(shell GIT_DIR=$(TOPDIR)/.git $(GIT) log -1 --format=%at)
export SOURCE_DATE_EPOCH = $(if $(wildcard $(TOPDIR)/.git),$(BR2_VERSION_GIT_EPOCH),$(BR2_VERSION_EPOCH))
endif