cmake_minimum_required(VERSION 2.8.12)
project(relative_path_test)

function(check_relative_path _src _dest _expected)
    file(RELATIVE_PATH _rel_path "${_src}" "${_dest}")
    if ("${_rel_path}" STREQUAL "${_expected}")
        message(STATUS "Test passed: relative path from ${_src} to ${_dst} is ${_rel_path}")
    else()
        message(WARNING "Test failed: relative path from ${_src} to ${_dst} returned ${_rel_path}, should be ${_expected}")
    endif()
endfunction()

check_relative_path("/usr/share" "/bin/bash" "../../bin/bash")
check_relative_path("/usr/./share/" "/bin/bash" "../../bin/bash")
check_relative_path("/usr/share/../bin/" "/bin/bash" "../../bin/bash")