https://github.com/Kitware/CMake
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Tip revision: ffa164736ec78f27583ca4515ff3dfc7a82fc702 authored by Brad King on 07 September 2017, 16:14:26 UTC
CMake 3.9.2
Tip revision: ffa1647
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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