https://github.com/Kitware/CMake
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Tip revision: 3bff90f8668ad24af80f1e45e2b498f4b9ec5f21 authored by Brad King on 02 July 2013, 12:39:24 UTC
CMake 2.8.11.2
Tip revision: 3bff90f
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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