https://github.com/Kitware/CMake
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Tip revision: 6fb747a01c27a2226fe4cbf77bc19e6d21286f81 authored by Brad King on 30 September 2019, 19:30:00 UTC
CMake 3.15.4
Tip revision: 6fb747a
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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