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Created by Kris Thielemans@krthieContributor

ExternalProject_Add and git tags

in our SuperBuild we use

  ExternalProject_Add(${proj}
 GIT_REPOSITORY ${${proj}_URL}
 GIT_TAG ${${proj}_TAG}
 ...)

We run into a problem when using a tag (as opposed to a hash or remote branch), the tag isn't recognised.

fatal: ambiguous argument 'rel_4.0.1': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'

Steps to reproduce

  1. git clone the superbuild
  2. build, everything is fine
  3. update one of the external projects and tag it
  4. build the superbuild with the new tag

It seems that ExternalProject_Add does a git fetch but not git fetch --tags. Some more info is at https://github.com/SyneRBI/SIRF-SuperBuild/issues/388

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