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function(PreventInTreeBuilds)
get_filename_component(srcdir "${CMAKE_SOURCE_DIR}" REALPATH)
get_filename_component(bindir "${CMAKE_BINARY_DIR}" REALPATH)
if("${srcdir}" STREQUAL "${bindir}")
message("")
message("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
message("Neovim doesn't support in-tree builds. It's recommended that you")
message("use a build/ subdirectory:")
message(" mkdir build")
message(" cd build")
message(" cmake <OPTIONS> ..")
message("")
message("Make sure to cleanup some CMake artifacts from this failed build")
message("with:")
message(" rm -rf CMakeFiles CMakeCache.txt")
message("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
message("")
message(FATAL_ERROR "Stopping build.")
endif()
endfunction()
PreventInTreeBuilds()
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