[dmd-beta] dmd 1.059 and 2.044 beta

[Robert Clipsham]

On 02/05/10 20:33, Jason House wrote:
> Maybe I'm just cursed with getting gdb to work with D :(  I've tried the
> plain vanilla gdb from my fresh install of ubuntu 10.04 as well as
> compiling the latest gdb from source.  I believe the basic things I'm
> doing should work with the plain vanilla gdb.
>
> $ ls *.d hb/*.d hb/*/*.d | wc -l
> 16
>
> $ dmd -gc -unittest -version=test *.d hb/*.d hb/*/*.d
> tango/core/Atomic.d tango/core/Traits.d -ofhousebot-test
>
> $ gdb ./housebot-test
> GNU gdb (GDB) 7.1-ubuntu
> <snip>
> Reading symbols from /home/jhouse/go/housebot/0.8/housebot-test...done.
> (gdb) break _Dmain
> Dwarf Error: Cannot find DIE at 0x0 referenced from DIE at 0x3f83 [in
> module /home/jhouse/go/housebot/0.8/housebot-test]
> (gdb) break main
> Breakpoint 1 at 0x805d097
> (gdb) run
> Starting program: /home/jhouse/go/housebot/0.8/housebot-test
> [Thread debugging using libthread_db enabled]
>
> Breakpoint 1, 0x0805d097 in main ()
> (gdb) list
> Dwarf Error: Cannot find DIE at 0x0 referenced from DIE at 0x3f83 [in
> module /home/jhouse/go/housebot/0.8/housebot-test]
> <snip>

You didn't say which dmd version, so I'll assume you're using dmd 1.059. 
If you're using anything earlier these errors are expected. The first 
step is to make sure that *everything* that has debug symbols is 
rebuilt. If you have a debug runtime or user library for tango that were 
built with -g, or with dmd <=1.058 then that will also cause these errors.

If you've checked all of the above, and are certain it's not PEBKAC then 
is there any chance you could email me a copy of your source code (or 
otherwise get a copy of your source to me, SVN/hg/git, uploading it 
somewhere, etc). If you can this will probably be the quickest/easiest 
way to figure out what's happening as I can narrow down these bugs in 
minutes after spending so long debugging DWARF errors now :P

If you can't do this for whatever reason, let me know and I'll give you 
some instructions on how to debug this further and work down a test case.

> $ latest_gdb_source/gdb/gdb ./housebot-test
> GNU gdb (GDB) 7.1.50.20100502-cvs
> <snip>
> Reading symbols from
> /home/jhouse/go/housebot/0.8/housebot-test...Segmentation fault
>
> $ gdb latest_gdb_source/gdb/gdb
> GNU gdb (GDB) 7.1.50.20100502-cvs
> <snip>
> Reading symbols from /home/jhouse/go/housebot/0.8/housebot-test...
> Program received signal SIGSEGV, Segmentation fault.
> 0x002a0d08 in ?? () from /lib/tls/i686/cmov/libc.so.6
> (gdb)

This is a gdb issue, you can either report a bug to gdb or give it a few 
revisions and try again... It is a cvs version, so it will be buggy :)