[patch] Add new -gmlt option for min. debug info with line tables (issue4440072)

[Jim Wilson]

On Tue, 2011-05-03 at 16:24 -0400, Jason Merrill wrote:
> That makes sense to me; it seems appropriate for -g1 to have information 
> that makes a backtrace more informative, but not information for 
> interactive debugging.  Jim, do you have an opinion?

I'm not aware of any significant use of -g1.  It is very rare for anyone
to mention it in a bug report for instance.  Once upon a time (before
2002-03-19), it was used for compiling libgcc, but that was just to
ensure that it got tested somewhere.  From my Cisco experience, I would
agree that backtraces without line numbers are not very useful.  It
would be OK with me if these changes were added to -g1 instead of
creating a new -gmlt option.

Jim