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CMP0009
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FILE GLOB_RECURSE calls should not follow symlinks by default.
In CMake 2.6.1 and below, FILE GLOB_RECURSE calls would follow through
symlinks, sometimes coming up with unexpectedly large result sets
because of symlinks to top level directories that contain hundreds of
thousands of files.
This policy determines whether or not to follow symlinks encountered
during a FILE GLOB_RECURSE call. The OLD behavior for this policy is
to follow the symlinks. The NEW behavior for this policy is not to
follow the symlinks by default, but only if FOLLOW_SYMLINKS is given
as an additional argument to the FILE command.
This policy was introduced in CMake version 2.6.2. CMake version
|release| warns when the policy is not set and uses OLD behavior. Use
the cmake_policy command to set it to OLD or NEW explicitly.
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