[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 #4 from Markus Metzger <markus.t.metzger at intel dot com> ---
(In reply to Tom Tromey from comment #3)
> Another option is to use a base class and derive the per-target classes
> from it.  'inferior' does this for private data.

I have a patch to c++ify the btrace_target_info similar to inferior and thread
private target data, but I cannot reproduce the original issue with GCC 11.4.0
on Ubuntu 22.04.

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.

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