Re: gcj/gdb in cross env

[David Daney <ddaney at avtrex dot com>]

FERANDELLE Pascal wrote:
> Andrew Haley a écrit :
>
>
> > FERANDELLE Pascal writes:
> > > I build gcc/gcj 4.1.0 in cross env for target powerpc-linux, and did the same for gdb 6.4.
> >
> > > As I have a "Segmentation fault" with an HelloWorld program written
> > > in Java, and compiled with powerpc-linux-gcj -g, I tried to launch
> > > powerpc-linux-gdb on the exec file, but an error occurred :
> > >
> > > Dwarf Error : wrong version in compilation unit header (is 99, should be 2) [in module HelloWorld]
> >
> > I don't understand this.
> >
> > You're not telling us what you are doing.  Where is gdb running?  On
> > the host or the target?
> >
> > If we're going to be of any use to you, you must post full information
> > about what you are doing.
>
>
> Host
>     powerpc-linux-gcj -g -o HW HW.java --main=HW --static
>
> Target
>     gdbserver host:2345 HW
>
> Host
>     powerpc-linux-gdb HW
>     -> Dwarf Error ...
>     under gdb : target remote vmpc:2345
>     but after, no debug is possible (no symbol table, no stack, etc)
>
> When I built gdb 6.4 for target powerpc-linux, I have to configure it with --disable-werror, because without that, the build stopped due to several warnings of "value computed is not used".

I don't know what is happening, but have several suggestions:

1) Perhaps try gdb 6.3.

2) Ask on the gdb@sources.redhat.com mailing list as the first thing you 
need to do is get gdb running.

3) Can you build a native gdb?  I have not had very much luck with 
gdbserver in the past.  If your target has enough virtual memory, it is 
probably best to run gdb on the target.  Configure gdb with something 
like --target=powerpc-linux --host=powerpc-linux 
--build=i686-pc-linux-gnu (or whatever the case may be).

David Daney.