Enable simulator on gdb

[Mike Frysinger]

On 19 Aug 2021 11:32, Andrew Burgess wrote:
> * 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.

gotcha.  posted a patch to turn it on for aarch64 & cris.
-mike