https://github.com/Kitware/CMake
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Tip revision: e6897c72e7c59f7a0b82ed19c1bdb40d42f7adaa authored by Brad King on 15 February 2019, 12:46:43 UTC
CMake 3.14.0-rc2
Tip revision: e6897c7
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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