https://github.com/Kitware/CMake
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Tip revision: c5541cf0da1093635fea7da5a40e64e481b5477e authored by Brad King on 09 March 2018, 13:33:11 UTC
CMake 3.11.0-rc3
Tip revision: c5541cf
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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