https://github.com/Kitware/CMake
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Tip revision: c1d5d5eb11e0260ffadda0851ac844ab46b6b179 authored by Brad King on 31 October 2019, 13:25:31 UTC
CMake 3.16.0-rc3
Tip revision: c1d5d5e
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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