GDB DWARF-1 C++ support

GDB DWARF-1 C++ support

[David Carlton]

[ I've retitled this bit of the thread and moved it to gdb@. ]

On Fri, 17 Jan 2003 13:28:08 -0600, Michael Elizabeth Chastain <mec@shout.net> said:

> Here is what I want to do about gdb DWARF-1 C++ support:

>   make a policy decision whether gdb supports DWARF-1 with C++

>   if yes:
>     remove all the setup_xfail_format DWARF-1 calls
>     add regular DWARF-1 testing
>     file about 50 new PR's for all the new FAIL's
>     file PR's against gcc for the external bugs (and they will hate us)

>   if no:
>     document that gdb supports C++ with DWARF-2 or stabs+ but not DWARF-1
>     add a DWARF-1 check to "skip_cplus_tests"
>     remove all the setup_xfail_format DWARF-1 calls

Yup.  I'm not familiar with DWARF-1, so conceivably it's possible
that we want to support C++ DWARF-1 debugging but that DWARF-1 is by
nature incapable of supporting the full range of C++ features, in
which case we'd only skip certain C++ tests under DWARF-1.  But I'm
really not worried about that possibility for now.

Anyways, my kneejerk reaction is that no, we shouldn't support it: I
have a hard time imagining a scenario where it would be a profitable
use of resources to work on supporting DWARF-1.  What platforms use it
as their native debugging format?  What C++ compilers run on those
platforms?

David Carlton
carlton@math.stanford.edu

Re: GDB DWARF-1 C++ support

[Daniel Jacobowitz]

On Fri, Jan 17, 2003 at 11:54:59AM -0800, David Carlton wrote:
> [ I've retitled this bit of the thread and moved it to gdb@. ]
> 
> On Fri, 17 Jan 2003 13:28:08 -0600, Michael Elizabeth Chastain <mec@shout.net> said:
> 
> > Here is what I want to do about gdb DWARF-1 C++ support:
> 
> >   make a policy decision whether gdb supports DWARF-1 with C++
> 
> >   if yes:
> >     remove all the setup_xfail_format DWARF-1 calls
> >     add regular DWARF-1 testing
> >     file about 50 new PR's for all the new FAIL's
> >     file PR's against gcc for the external bugs (and they will hate us)
> 
> >   if no:
> >     document that gdb supports C++ with DWARF-2 or stabs+ but not DWARF-1
> >     add a DWARF-1 check to "skip_cplus_tests"
> >     remove all the setup_xfail_format DWARF-1 calls
> 
> Yup.  I'm not familiar with DWARF-1, so conceivably it's possible
> that we want to support C++ DWARF-1 debugging but that DWARF-1 is by
> nature incapable of supporting the full range of C++ features, in
> which case we'd only skip certain C++ tests under DWARF-1.  But I'm
> really not worried about that possibility for now.
> 
> Anyways, my kneejerk reaction is that no, we shouldn't support it: I
> have a hard time imagining a scenario where it would be a profitable
> use of resources to work on supporting DWARF-1.  What platforms use it
> as their native debugging format?  What C++ compilers run on those
> platforms?

I believe no recent version of GCC uses DWARF-1 that does not also
support DWARF-2.  We support oddball C compilers, but not oddball C++
compilers, in general.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

Re: GDB DWARF-1 C++ support

[Daniel Berlin]

On Friday, January 17, 2003, at 02:56  PM, Daniel Jacobowitz wrote:

> On Fri, Jan 17, 2003 at 11:54:59AM -0800, David Carlton wrote:
>> [ I've retitled this bit of the thread and moved it to gdb@. ]
>
> I believe no recent version of GCC uses DWARF-1 that does not also
> support DWARF-2.  We support oddball C compilers, but not oddball C++
> compilers, in general.
>
Err, I wasn't aware there *was* any other kind of C++ compiler.
:P
--Dan

Re: GDB DWARF-1 C++ support

[Elena Zannoni]

Sorry, I am really busy, and didn't participate in this thread, but
NO! dwarf1 support should be dead.  I am looking at gcc:

% grep DWARF config/*
these are the only references to DWARF1 I can spot, and I bet are really old.


config/elfos.h:/* System V Release 4 uses DWARF debugging info.  */
config/elfos.h:#define DWARF_DEBUGGING_INFO 1
config/ptx4.h:/* Use DWARF debugging info by default.  */
config/ptx4.h:#define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG

Elena



David Carlton writes: > [ I've retitled this bit of the thread and
moved it to gdb@. ]
 > 
 > On Fri, 17 Jan 2003 13:28:08 -0600, Michael Elizabeth Chastain <mec@shout.net> said:
 > 
 > > Here is what I want to do about gdb DWARF-1 C++ support:
 > 
 > >   make a policy decision whether gdb supports DWARF-1 with C++
 > 
 > >   if yes:
 > >     remove all the setup_xfail_format DWARF-1 calls
 > >     add regular DWARF-1 testing
 > >     file about 50 new PR's for all the new FAIL's
 > >     file PR's against gcc for the external bugs (and they will hate us)
 > 
 > >   if no:
 > >     document that gdb supports C++ with DWARF-2 or stabs+ but not DWARF-1
 > >     add a DWARF-1 check to "skip_cplus_tests"
 > >     remove all the setup_xfail_format DWARF-1 calls
 > 
 > Yup.  I'm not familiar with DWARF-1, so conceivably it's possible
 > that we want to support C++ DWARF-1 debugging but that DWARF-1 is by
 > nature incapable of supporting the full range of C++ features, in
 > which case we'd only skip certain C++ tests under DWARF-1.  But I'm
 > really not worried about that possibility for now.
 > 
 > Anyways, my kneejerk reaction is that no, we shouldn't support it: I
 > have a hard time imagining a scenario where it would be a profitable
 > use of resources to work on supporting DWARF-1.  What platforms use it
 > as their native debugging format?  What C++ compilers run on those
 > platforms?
 > 
 > David Carlton
 > carlton@math.stanford.edu