https://github.com/Kitware/CMake
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Tip revision: d5401de605af11ad3cd1c6faa64bf319af6b67c6 authored by Brad King on 15 February 2021, 16:48:33 UTC
CMake 3.19.5
Tip revision: d5401de
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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