https://github.com/Kitware/CMake
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Tip revision: 3a77329c40803b02fe33ffc86197c1baf291aaff authored by Brad King on 02 November 2018, 12:05:07 UTC
CMake 3.12.4
Tip revision: 3a77329
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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