CMAKE_CONFIGURE_DEPENDS

Tell CMake about additional input files to the configuration process. If any named file is modified the build system will re-run CMake to re-configure the file and generate the build system again.

Specify files as a semicolon-separated list of paths. Relative paths are interpreted as relative to the current source directory.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.6/prop_dir/CMAKE_CONFIGURE_DEPENDS.html