Re: gdb and lttng-ust 0.12

[Saul Wold <sgw@linux.intel.com>]

On 04/24/2011 10:14 PM, Cui, Dexuan wrote:
> Hi Saul,
> I prefer "continue with UST disabled in gdb" for now.
> 
Ok, I have a patch queue'ed up already with this fix, I will push it as
part of a consolidated request later tonight.

> I'm investigating more to get an in-depth understanding about the issue. e.g., ust-0.11 doesn't break building gdb while ust-0.12 does -- however both 0.11 and 0.12 install /usr/include/ust/.
>
I agree, I am not sure why this is happening also, I thought that I did
installs of 0.11 and did not see the ust directory, maybe I did not
force or something.  Maybe diff the marker.h files and see if there are
differences?

Sau!


> Thanks,
> -- Dexuan
> 
> -----Original Message-----
> From: Cui, Dexuan
> Sent: 2011年4月25日 9:57
> To: 'Saul Wold'; 'Patches and discussions about the oe-core layer'
> Cc: poky@yoctoproject.org
> Subject: RE: gdb and lttng-ust 0.12
> 
> Hi Saul,
> Thanks very much for the investigation!
> I can reproduce the issue now when I build gdb after building lttng-ust (previously looks I built them in the reverse order, so didn't catch it.)
> 
> I haven't understood why this issue occurred after I upgraded ust from 0.11 to 0.12 as 0.11 actually installs /usr/include/ust, too. And gdb was not upgraded recently.
> 
> I'm looking into this now and will update asap.
> 
> Thanks,
> -- Dexuan
> 
> -----Original Message-----
> From: Saul Wold [mailto:sgw@linux.intel.com]
> Sent: 2011年4月25日 4:17
> To: Cui, Dexuan; 'Patches and discussions about the oe-core layer'
> Cc: poky@yoctoproject.org
> Subject: gdb and lttng-ust 0.12
> 
> 
> Dexuan,
> 
> It seems that when you updated lttng-ust to 0.12, it installed an
> /usr/include/ust directory that GDB now finds.  This caused the
> gdbserver code to not build.
> 
> I investigated this and it seems to be due to gdb having a dependency on
> UST that causes GDB not to compile.  I think at this point we may want
> to continue with UST disabled in gdb.
> 
> To reproduce this, ensure that lttng-ust-0.12 is built before building
> gdb and you should see a compilation failure.
> 
> My concern here is that if fix the GDB compilation failures, what else
> is going to fail as far as debugging with UST enabled on the remote, I
> know this feature is something we want, and should probably report to
> the GDB upstream.
> 
> The fix seems to be as simple as adding "--without-ust" to the gdb
> EXTRA_OECONF line.
> 
> Comments?
>