[MESOS-9414] Rework FindPackageHelper to allow for locating xxx_ROOT_DIR.

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 1.8.0
• Component/s: build, cmake
• Labels: cmake unbundled-dependencies
• Epic Link: cmake-unbundling
• Story Points: 2
• Assignee: Unassigned
• Reporter: Till Toenshoff
• Created: 25/Nov/18 14:28
• Updated: 29/Apr/19 09:27

Description

With the introduction of unbundled libevent, libarchive and leveldb CMake builds, code duplication within the respective FindXXX.cmake modules became apparent and a refactoring seems adequate.

See this TODO: https://github.com/apache/mesos/blob/e6b507b6469553725c98b953f9578ab3f1a40b93/3rdparty/cmake/FindLIBARCHIVE.cmake#L19