https://github.com/Kitware/CMake
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Tip revision: 512ab500f06d6c645985cc8014c5e6291b9a059f authored by Brad King on 19 December 2019, 14:54:31 UTC
CMake 3.16.2
Tip revision: 512ab50
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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