https://github.com/Kitware/CMake
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Tip revision: 4771c4e447c88a0e6a361d98c2c6f44ac7746ad3 authored by Brad King on 10 December 2019, 14:40:28 UTC
CMake 3.16.1
Tip revision: 4771c4e
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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