https://github.com/Kitware/CMake
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Tip revision: 91ccfa330240ccd9766f59d9efcac595c4a1b033 authored by Brad King on 01 November 2022, 13:36:33 UTC
CMake 3.23.5
Tip revision: 91ccfa3
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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