Pick up date from SOURCE_DATE_EPOCH, for reproducible builds #18
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The goal of reproducible builds is that a rebuild of the same source code with the same compiler, libraries, etc. should result in the same binaries. SOURCE_DATE_EPOCH provides a standard way for build systems to fill in the date of the latest source change, typically from a git commit or from metadata like the debian/changelog in Debian packages. This does not change anything if SOURCE_DATE_EPOCH is not defined; the intention is that a larger build system like a Debian package will define it. Please see https://reproducible-builds.org/ for more information about reproducible builds. Originally sent to ioquake3 as commit ioquake/ioq3@9c76b54 (which also touched engine files not present here). Signed-off-by: Simon McVittie <smcv@debian.org>
With a suitable setting for SOURCE_DATE_EPOCH, this makes building qagame.qvm reproducible too. Signed-off-by: Simon McVittie <smcv@debian.org>
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The goal of reproducible builds is that a rebuild of the same source code with the same compiler, libraries, etc. should result in the same binaries. SOURCE_DATE_EPOCH provides a standard way for build systems to fill in the date of the latest source change, typically from a git commit or from metadata like the debian/changelog in Debian packages.
This does not change anything if SOURCE_DATE_EPOCH is not defined; the intention is that a larger build system like a Debian package will define it.
Please see https://reproducible-builds.org/ for more information about reproducible builds.
Most of this pull request was sent to ioquake3 as commit ioquake/ioq3@9c76b54 (which also touched engine files not present here). This version also defines
PRODUCT_DATEwhen invokingq3lcc, makingqagame.qvmreproducible if a suitableSOURCE_DATE_EPOCHis provided.