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CMake: Policy CMP0144 NEW (BOOST_ROOT) - #65
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Let `find_package` use upper-case `<PACKAGENAME>_ROOT` variables, e.g., `BOOST_ROOT` as set by many HPC modules. Silences the CMP0144 dev warning with CMake 3.27+. The CMake minimum stays 3.12. Close ECP-WarpX#57 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Set CMake policy CMP0144 to NEW so
find_packageuses upper-case<PACKAGENAME>_ROOTvariables, e.g., theBOOST_ROOTthat many HPC modules set. This silences the CMP0144 warning with CMake 3.27+.https://cmake.org/cmake/help/latest/policy/CMP0144.html
Close #57