[Bug build/30751] [gdb/build] ODR violation for struct btrace_target_info

["markus.t.metzger at intel dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30751

--- Comment #9 from Markus Metzger <markus.t.metzger at intel dot com> ---
(In reply to Tom de Vries from comment #8)
> (In reply to Markus Metzger from comment #4)
> > After configuring, I build GDB with:
> > 
> >     $ make -sj$(nproc) CFLAGS='-O2 -flto -Wall' CXXFLAGS='-O2 -flto -Wall'
> > 
> > and I get several fails, e.g.
> > 
> > .../sim/m32r/traps.c:115:43: error: type of 'm32r2f_h_psw_get' does not
> > match original declaration [-Werror=lto-type-mismatch]
> >   115 |           m32r2f_h_bpsw_set (current_cpu, m32r2f_h_psw_get
> > (current_cpu));
> > 
> > but no -Wodr warnings nor any other warnings related to btrace.
> 
> I think what may be happening is that if you're getting an error while
> building sim, gdb is not build at all, because all-gdb requires
> maybe-all-sim.
> 
> In that case, you could try building with --disable-sim.

After disabling sim, I get

bfd/elf32-xtensa.c:5725:41: error: 'MEM[(struct removal_by_action_entry
*)ientry_91 + -24B].offset' may be used uninitialized
[-Werror=maybe-uninitialized]
 5725 |   if (ctx->map.n_entries && (ientry - 1)->offset == r->offset)
      |                                    

but when I build with 'make -k' I can now reproduce the error and confirm that
it is fixed with my patch.

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