https://github.com/Kitware/CMake
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Tip revision: 50fc9d5b45a7dcbb11152ea77b2d47c66e277265 authored by Brad King on 16 February 2021, 17:11:10 UTC
CMake 3.20.0-rc1
Tip revision: 50fc9d5
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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