• Brad King's avatar
    find_package: Use PackageName_ROOT variables as search prefixes · eb35d888
    Brad King authored
    This feature was originally added by commit v3.9.0-rc1~71^2~2 (find_*:
    Add a new PackageRoot search path group, 2017-05-03) and documented by
    commit v3.9.0-rc1~71^2 (find_*: Add docs for PackageRoot search path
    group, 2017-05-03).  However, we had to disable the feature and remove
    the documentation in commit v3.9.1~2^2 (find_*: Disable the PACKAGE_ROOT
    search path group for CMake 3.9, 2017-08-08) due to breaking projects
    that used `PackageName_ROOT` variables themselves.
    
    Add policy `CMP0074` to restore the `PackageName_ROOT` variable behavior
    in a compatible way.  Also revise the stack of root paths to store the
    paths themselves rather than the package names.  This way the policy can
    be considered at the `find_package` call site instead of individual
    `find_` calls inside a find module.
    
    Co-Author: Chuck Atkins <chuck.atkins@kitware.com>
    Issue: #17144
    eb35d888