https://github.com/Kitware/CMake
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Tip revision: 732d8a467ab8a295b1bbf580f865980f8a1a9b29 authored by Brad King on 10 March 2015, 13:15:35 UTC
CMake 3.2.1
Tip revision: 732d8a4
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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