https://github.com/Kitware/CMake
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Tip revision: 166bf4c490b8f46eca057fc23c3f3c2e042e9cb3 authored by Brad King on 13 December 2017, 13:34:28 UTC
CMake 3.10.1
Tip revision: 166bf4c
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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