https://github.com/Kitware/CMake
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Tip revision: f65cebf51a2cf3af2017fd9b03c685c77da00c74 authored by Brad King on 27 October 2021, 13:51:39 UTC
CMake 3.21.4
Tip revision: f65cebf
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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