https://github.com/Kitware/CMake
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Tip revision: f478fa633daeb1432805821adddc40730ffd283d authored by Brad King on 07 September 2018, 10:40:49 UTC
CMake 3.12.2
Tip revision: f478fa6
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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