file(GENERATE) behavior for relative paths.
CMake 3.10 and newer define that relative paths given to
OUTPUT arguments of
file(GENERATE) are interpreted relative to the current source and binary directories, respectively. CMake 3.9 and lower did not define any behavior for relative paths but did not diagnose them either and accidentally treated them relative to the process working directory. Policy
CMP0070 provides compatibility with projects that used the old undefined behavior.
This policy affects behavior of relative paths given to
OLD behavior for this policy is to treat the paths relative to the working directory of CMake. The
NEW behavior for this policy is to interpret relative paths with respect to the current source or binary directory of the caller.
This policy was introduced in CMake version 3.10. CMake version 3.15.2 warns when the policy is not set and uses
OLD behavior. Use the
cmake_policy() command to set it to
OLD behavior of a policy is
deprecated by definition and may be removed in a future version of CMake.
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