https://github.com/Kitware/CMake
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Tip revision: 6784acfbe0fde03b577ab814946b309821ca6242 authored by Brad King on 09 October 2018, 13:04:28 UTC
CMake 3.13.0-rc1
Tip revision: 6784acf
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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