https://github.com/Kitware/CMake
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Tip revision: 7f1569d2d8c1a647cf4d1b0696834952cf8f00fb authored by Brad King on 09 July 2018, 12:06:27 UTC
CMake 3.12.0-rc3
Tip revision: 7f1569d
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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