This is a known issue. GDB older then v10.1 does not support some DWARFv5 features, while clang gets DWARFv5 enabled by default. You can either use newer version of GDB or switch to DWARFv4 (-gdwarf-4).
Here are some details Gdb < 10.1 can't read clang's DWARF v5 - #12 by tstellar.
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