reproducible_builds: SOURCE_DATE_EPOCH should not be 0
A SOURCE_DATE_EPOCH of 0 might be misinterpreted by namely rpm as no SDE.
e.g.:
char *srcdate = getenv(SOURCE_DATE_EPOCH);
if (srcdate && rpmExpandNumeric(%{?clamp_mtime_to_source_date_epoch}))
Solve this by:
- providing a SOURCE_DATE_EPOCH_FALLBACK variable != 0
- changing defaults to use it
- using SOURCE_DATE_EPOCH_FALLBACK also when reading 0 out of sstate-cache
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
