CMAKE_CODEBLOCKS_EXCLUDE_EXTERNAL_FILES
Change the way the CodeBlocks generator creates project files.
If this variable evaluates to ON the generator excludes from the project file any files that are located outside the project root.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.17/variable/CMAKE_CODEBLOCKS_EXCLUDE_EXTERNAL_FILES.html