https://github.com/Kitware/CMake
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Tip revision: b5c54d9c8a1fdfdbf1a133040029a4924b69185e authored by Brad King on 25 July 2023, 17:58:09 UTC
CMake 3.27.1
Tip revision: b5c54d9
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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