Patrick Gartung 8e47b17a4d Buildcache: symlinks, externals, & install-checking (#5894) ... * When creating a tar of a package for a build cache, symlinks are preserved (the corresponding path in the newly-created tarfile will be a symlink rather than a copy of the file) * Dont add external packages to a build cache * When installing from binary cache, don't create install prefix until verification is complete		2017-10-26 11:06:59 -07:00
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spack	Buildcache: symlinks, externals, & install-checking (#5894)	2017-10-26 11:06:59 -07:00