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Robert Dailey authored
FindDoxygen generates some files based on the version of Doxygen whose content will not vary across a project and are therefore a global resource that can be shared by all calls to `find_package(Doxygen)` and to `doxygen_add_docs`. We currently use `${PROJECT_BINARY_DIR}` to reference their location, but this is not stable because `project()` calls in a subdirectory can change it. Use `${CMAKE_BINARY_DIR}` instead. Reviewed-by: Craig Scott <craig.scott@crascit.com> Fixes: #17022
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