Enable simulator on gdb

[Andrew Burgess]

* Mike Frysinger <vapier@gentoo.org> [2021-08-17 18:13:37 -0400]:

> On 29 Jul 2021 09:49, Andrew Burgess wrote:
> > * 任建军 via Gdb <gdb@sourceware.org> [2021-07-16 11:52:33 +0800]:
> > 
> > >    I have a complie question, An help me answer it? 
> > >    I use binutils-gdb source code to build gdb for aarch64，the version is “gdb-9.2-release”,   and complie command line is "./configure --target=aarch64 --enable-sim".
> > >    Compile is completed, but when i enter gdb and type command "target sim"  , gdb said  "Undefined target command: "sim": ..." ,  am i missed someting when i complie gdb? 
> > 
> > The problem is that in gdb/configure.tgt there is no link to the
> > compiled simulator.  The patch below adds this link for aarch64-elf
> > targets.
> > 
> > I believe the reason for this is that the aarch64 simulator is
> > considered deprecated in favour of using QEMU.  Or it could just be an
> > oversight that this link is missing.
> 
> while i love QEMU, i'm not sure it should be relevant wrt decisions about the
> GNU sim and its integration in places.
> 
> > Either way, this should get it working for you.
> > 
> > --- a/gdb/configure.tgt
> > +++ b/gdb/configure.tgt
> > @@ -117,6 +117,7 @@ case "${targ}" in
> >  aarch64*-*-elf | aarch64*-*-rtems*)
> >  	# Target: AArch64 embedded system
> >  	gdb_target_obs="aarch64-newlib-tdep.o"
> > +	gdb_sim=../sim/arm/libsim.a
> 
> guessing you meant aarch64 there and not arm ?

Yes I did.  Thanks.

Andrew