https://github.com/Kitware/CMake
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Tip revision: 0d5a2252ef8a586f4fc70a66aabd17fb3fd52110 authored by Brad King on 31 May 2017, 13:47:47 UTC
CMake 3.8.2
Tip revision: 0d5a225
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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