-gdwarf-version not working properly in GCC 11

[Sebastian Perta]

I'm using a debugger which doesn't support DWARF 5 so I used the -gdwarf-version (-gdwarf-4) option since DWARF 5 has become the default in GCC 11 (GNU Toolchain for the Arm Architecture 11.2-2022.02 (arm-11.16)) 11.2.1 20220111)
Unfortunately, although the my object files are DWARF 4, I still end up with object files from libraries which have debug information with DWARF 5 which renders the option useless.
In order to make it work I had to use "arm-none-eabi-objcopy --strip-debug" to remove the debug information from the *.a files in question.

For example <install folder>\arm-none-eabi\11.2.1\thumb\v7e-m+fp\hard\libg_nano.a is 4.5 KB after after debug striping it shrinks to <1KB just like in GCC 10 ((GNU Arm Embedded Toolchain 10.3-2021.10) 10.3.1 20210824 (release)) where the libraries don't include debug information.

This seems to be reason why the size of the whole install folder in GCC 11 is almost 3.6 GB while GCC 10 is less than 800 MB.