D7693: Enable reproducible packaging of template archives

[Aaron Puchert]

aaronpuchert created this revision.

REVISION SUMMARY
  Builds of KDevelop are not reproducible right now because the archives
  containing templates contain metadata related to the build environment,
  such as the time of checkout. The order of files in an archive is also
  not guaranteed.
  
  The Reproducible Builds project recommends [1] to use (in addition to
  what we have) --mtime="@${SOURCE_DATE_EPOCH}" and --sort=name. This will
  only be used if the environment variable is set. The latter option is
  available only since tar 1.28 (from 2014), but we assume that people
  have it if they know about reproducible builds.
  
  [1] https://reproducible-builds.org/docs/archives/

REPOSITORY
  R32 KDevelop

BRANCH
  reproducible-build

REVISION DETAIL
  https://phabricator.kde.org/D7693

AFFECTED FILES
  kdevplatform/cmake/modules/KDevPlatformMacros.cmake

To: aaronpuchert, #kdevelop
Cc: kdevelop-devel
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