https://github.com/Kitware/CMake
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Tip revision: 7700df9b1ef66761cad08cfc08344d5b27660e9f authored by Brad King on 22 April 2019, 11:42:52 UTC
CMake 3.14.3
Tip revision: 7700df9
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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