https://github.com/Kitware/CMake
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Tip revision: 57622bd19d3fd013038d34f497b106a7e2bfd26d authored by Brad King on 20 January 2015, 16:04:44 UTC
CMake 3.1.1
Tip revision: 57622bd
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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