Re: GDB 12.0.90 available for testing

[Luis Machado <luis.machado@arm.com>]

Hi Joel,

On 4/12/22 18:57, Joel Brobecker wrote:
> Hi Luis,
> 
>> On 3/20/22 05:58, Joel Brobecker via Gdb-patches wrote:
>>> Hello,
>>>
>>> I have just finished creating the gdb-12.0.90 pre-release.
>>> It is available for download at the following location:
>>>
>>>       ftp://sourceware.org/pub/gdb/snapshots/branch/gdb-12.0.90.tar.xz
>>>
>>> A gzip'ed version is also available: gdb-12.0.90.tar.gz.
>>>
>>> Please give it a test if you can and report any problems you might find.
>>>
>>> On behalf of all the GDB contributors, thank you!
>>
>> It seems GDB doesn't build with --enable-targets=all for 32-bit Arm. I think
>> this is a long-standing bug that has not been fixed yet.
>>
>> I'd consider this a blocker for the release, as builds shouldn't fail.
> 
> Generally speaking, I tend to agree, but at the same time, it really
> depends.
> 
> Is this specific to GDB 12, or did we have this issue with previous
> releases?

This has been introduced in GDB 12 development as far as I remember. It 
is similar/related to the following:

https://sourceware.org/pipermail/binutils/2021-November/118485.html

Also discussed slightly in 
https://sourceware.org/bugzilla/show_bug.cgi?id=28684.

I reported it back then: 
https://sourceware.org/pipermail/binutils/2021-November/118554.html.

It might be an easy configure adjustment, but I'm not familiar with bpf.

I know Jose Marchesi did work on bpf, but I'm not sure if he is the 
right PoC.

> 
> We also need some kind of visibility as to how quickly we think we can
> solve that issue. This usually requires someone to act as the issue's
> "champion" -- that person might not be the one actually making the fix,
> but they can at least try help expedite the process.

Agreed. I just want to make sure this has visibility so we can try to 
fix it before release.

> 
>> I get the following:
>>
>> binutils-gdb-armhf-bionic/sim/bpf/../../../../repos/binutils-gdb/sim/bpf/../common/sim-close.c:43:
>> undefined reference to `bpf_cgen_cpu_close'
>>
>> binutils-gdb-armhf-bionic/sim/bpf/../../../../repos/binutils-gdb/sim/bpf/sim-if.c:166:
>> undefined reference to `bpf_cgen_cpu_open_1'
>>
>> binutils-gdb-armhf-bionic/sim/bpf/../../../../repos/binutils-gdb/sim/bpf/sim-if.c:179:
>> undefined reference to `bpf_cgen_init_dis'
>>
>> This is GCC 7.5.0 on Ubuntu 18.04.
>>
>> Should I go ahead and open a ticket against the release? I'm not sure who is
>> responsible for handling BPF.
> 
> I'd start by asking Mike Frysinger, who's the sim maintainer.
> He might not know about this particular target, but he's made
> a lot of cleanups in this area.
> 
> In this case, hopefully the fix won't be too difficult.
> 

cc-ed both Mike and Jose Marchesi.

Thanks,
Luis