Other Dwarf version mismatch: GCC6 libs vs GDB

I'm running a Fortran program under GDB and GDB complains that the Dwarf version in several GCC6 libraries is 4 and should be 2. I had the same problem with my program and fixed (?) it by compiling with -gdwarf-2, but I can't do that with the GCC libraries. I'm wondering if I should somehow update GDB to be consistent with GCC6 and Dwarf version 4. The GDB version is 6.1.1.
I was told by a FreeBSD developer that gdb in the base is quite old and almost useless. You need to install gdb from ports to get the latest version.
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