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# Extend the path in `base_path` with the path in `current_segment`, returning
# the result in `joined_path`. If `current_segment` is an absolute path then
# just return it, in effect overriding `base_path`, and issue a warning.
#
# Note that the code returns a relative path (avoiding introducing leading
# slashes) if `base_path` is empty.
function(extend_path joined_path base_path current_segment)
if("${current_segment}" STREQUAL "")
set(temp_path "${base_path}")
elseif("${base_path}" STREQUAL "")
set(temp_path "${current_segment}")
elseif(IS_ABSOLUTE "${current_segment}")
message(WARNING "Since \"${current_segment}\" is absolute, it overrides install path: \"${base_path}\".")
set(temp_path "${current_segment}")
else()
set(temp_path "${base_path}/${current_segment}")
endif()
set(${joined_path} "${temp_path}" PARENT_SCOPE)
endfunction()
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