https://github.com/Kitware/CMake
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Tip revision: ceb742a8fbadbda57bd288c1677a5d2dc791234f authored by Brad King on 27 November 2023, 18:48:12 UTC
CMake 3.26.6
Tip revision: ceb742a
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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