When i compilation the FUEL ,can't generate the liblkh_tsp_solver.so

[LiuL0ngl0ng]

fuel_planner/utils/lkh_tsp_solver/CMakeFiles/lkh_tsp.dir/build.make:2842: recipe for target '/home/user/fuel/devel/lib/lkh_tsp_solver/lkh_tsp' failed
make[2]: *** [/home/user/fuel/devel/lib/lkh_tsp_solver/lkh_tsp] Error 1
CMakeFiles/Makefile2:447: recipe for target 'fuel_planner/utils/lkh_tsp_solver/CMakeFiles/lkh_tsp.dir/all' failed
make[1]: *** [fuel_planner/utils/lkh_tsp_solver/CMakeFiles/lkh_tsp.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
fuel_planner/utils/lkh_tsp_solver/CMakeFiles/lkh_tsp_solver.dir/build.make:2850: recipe for target '/home/user/fuel/devel/lib/liblkh_tsp_solver.so' failed
make[2]: *** [/home/bit/fuel/devel/lib/liblkh_tsp_solver.so] Error 1
CMakeFiles/Makefile2:548: recipe for target 'fuel_planner/utils/lkh_tsp_solver/CMakeFiles/lkh_tsp_solver.dir/all' failed
make[1]: *** [fuel_planner/utils/lkh_tsp_solver/CMakeFiles/lkh_tsp_solver.dir/all] Error 2
Makefile:140: recipe for target 'all' failed
make: *** [all] Error 2
then,I want to see the files "/home/user/fuel/devel/lib",it is empty!!!,i think "liblkh_tsp_solver.so" should keep in the "/home/user/fuel/devel/lib".

[LiuL0ngl0ng]

When i switch my g++/gcc to 8.4 version, the issue is solved.