Gdb < 10.1 can't read clang's DWARF v5

[tstellar]

@pogo59

It could well be the case that gcc/gdb originally assumed that this form and its friends would be seen only with split DWARF, and that assumption percolated into other utilities. But, by the time split DWARF was standardized, these forms were all made applicable to non-split DWARF as well.

This is correct, from what I’ve been told gdb assumes this will only be seen with split DWARF.

@pogo59

@dblaikie @tstellar I’d say there is a decision to make here, whether to revert the change in default until after the release branch (next week?) and then put it back in place. That will hopefully give distros more time to catch up with the DWARF v5 realities?

I would lean towards keeping dwarf-5 the default upstream and for the LLVM-14 release. I think this is the best way to get the GNU tools to support clang’s DWARF output better. It’s not that hard for distros to roll it back if they want.