https://github.com/Kitware/CMake
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Tip revision: b3ebb8f4344d4a3665d7be45a34773fecb94c67f authored by Brad King on 13 May 2014, 13:34:03 UTC
CMake 3.0.0-rc5
Tip revision: b3ebb8f
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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