Re: Phasing out Dwarf 1?

[mec dot gnu at mindspring dot com (Michael Elizabeth Chastain)]

Hi Andrew,

> I believe that you've already demonstrated that there are no dwarf-1 
> cross compilers left (they've all migrated to dwarf-2).

I'm a bit confused by the "cross compiler" part.  For gcc I looked at
the config/ bits for all the targets without regard to hosts, so I've
always been looking at both natives and crosses.  For diab and absoft I
read their online manuals and release notes.

> That just leaves us with dwarf-1 systems.  How many dwarf-1 systems does 
> GDB still support?  If we've also eliminated all our dwarf-1 systems, 
> there's little sense in retaining dwarf-1 support.

What do you mean by 'dwarf-1 system'?  If you include systems that
support both dwarf-1 and dwarf-2, even if dwarf-1 is not the default,
then up to gcc 3.3.3, that includes most ELF-based systems.  But all
those users have upgrade paths to dwarf-2.

If you mean, 'systems where prefer dwarf-1 is the preferred debugging
format', here's a table.

  gcc 3.4.0
    none

  gcc 3.3.2
    i[34567]86-sequent-ptx4*	no longer supported by gdb
    i[34567]86-sequent-sysv4*	no longer supported by gdb
    mips-sni-sysv4		no longer supported by gdb
    sparc-hal-solaris2*		still supported by gdb (i think)

  gcc 3.2.2
    all targets from gcc 3.3.3, plus
     i[34567]86-dg-dgux*	still supported by gdb
     m88k-dg-dgux*		no longer supported by gdb

  gcc 2.95.3
    all targets from gcc 3.2.2, plus
     i[34567]86-ncr-sysv4*	still supported by gdb
     i[34567]86-*-osf1*		no longer supported by gdb
     i[34567]86-*-sco3.2v5*	still supported by gdb
     i[34567]86-*-sysv4*	still supported by gdb
     i860-alliant-*		no longer supported by gdb
     i860-*-sysv4*		no longer supported by gdb
     m68k-atari-sysv4*		no longer supported by gdb
     m68k-cbm-sysv4*		no longer supported by gdb
     m68k-*-sysv4*		no longer supported by gdb
     m88k-*-sysv4*		no longer supported by gdb
     mips-*-gnu*		no longer supported by gdb
     sh-*-elf*			still supported by gdb
     sh-*-rtemself*		still supported by gdb
     sparc-*-sysv4*		still supported by gdb

That's just gcc.  It doesn't include systems with non-gcc compilers
that still emit dwarf-1.  I don't know if any such systems exist.

So if somebody has an i386-dg-dgux system, they could still be
using gcc 3.2.2 and dwarf-1.  Or i686-unknown-sco3.2v5 and
gcc 2.95.3.  Or sparc-*-sysv4* and gcc 2.95.3.

I'm not sure what the thrust of your question is so I don't know
if this is the info that you're looking for.

Michael C