https://github.com/Kitware/CMake
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Tip revision: 344f9ed96a4cc457810ca84cf6549f7a4218fd8a authored by Brad King on 05 June 2017, 14:32:40 UTC
CMake 3.9.0-rc1 version update
Tip revision: 344f9ed
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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