https://github.com/Kitware/CMake
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Tip revision: 3a0db0223b8c10cfaa6984253d794ab97425adf9 authored by Brad King on 23 July 2015, 12:49:45 UTC
CMake 3.3.0
Tip revision: 3a0db02
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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