https://github.com/Kitware/CMake
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Tip revision: 43ddc6403227cc749916d47dd9f6c634f1aa4cc1 authored by Brad King on 15 September 2020, 12:11:59 UTC
CMake 3.16.9
Tip revision: 43ddc64
check_mark.cmake
if(EXISTS "${MARK_FILE}")
  message(FATAL_ERROR "Custom command run more than once!")
else()
  file(WRITE "${MARK_FILE}" "check for running custom command twice\n")
endif()
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