https://github.com/Kitware/CMake
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Tip revision: ff7a2e37bfff23ce1751a93b3eba179fbf32a9b6 authored by Brad King on 14 July 2021, 14:10:23 UTC
CMake 3.21.0
Tip revision: ff7a2e3
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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