Review Request 128278: Re-use tar macro from kdevplatform. To fix dependent builds reproducibility.

[Nicolás Alvarez]

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This brings compatibility problems with non-Linux and old Linux distros, as it will need GNU tar 1.28. I'll see if I can do something about it, maybe checking for tar's presence and using `cmake -E tar` as a fallback (printing a warning).

- Nicolás Alvarez


On June 24, 2016, 10:27 a.m., Scarlett Clark wrote:
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> https://git.reviewboard.kde.org/r/128278/
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> (Updated June 24, 2016, 10:27 a.m.)
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> Review request for Extra Cmake Modules, Sune Vuorela and Simon Wächter.
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> Repository: extra-cmake-modules
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> Description
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> Cmake tar command does not allow for switches that fix umask and user/group inconsistancy which cause unreproducible builds. This patch takes the tar command used in kdevplatform that has all the required switches to make builds that use this macro reproducible.
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> Diffs
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>   kde-modules/KDEPackageAppTemplates.cmake c0eb8b9 
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> Diff: https://git.reviewboard.kde.org/r/128278/diff/
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> Testing
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> Build and installed ECM and then rebuilt an affected project ( plasma-framework ) which is now reproducible.
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> Thanks,
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> Scarlett Clark
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