https://github.com/Kitware/CMake
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Tip revision: 62942969062fcc9f24ca057b6983532a973cfad6 authored by Brad King on 28 November 2018, 11:49:16 UTC
CMake 3.13.1
Tip revision: 6294296
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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