https://github.com/Kitware/CMake
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Tip revision: 1eed682d7cca9bb2c2b0709a6c3202a3b08613b2 authored by Brad King on 14 December 2023, 15:47:27 UTC
CMake 3.28.1
Tip revision: 1eed682
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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