[OE-core] [PATCH 01/17] conf/bitbake.conf package.bbclass: fix dbg package not contain sources while -fdebug-prefix-map used

[Paul Eggleton]

On Mon, 18 Apr 2016 13:50:15 Mark Hatle wrote:
> On 4/18/16 9:16 AM, Andreas Müller wrote:
> > On Mon, Apr 18, 2016 at 3:55 PM, Burton, Ross <ross.burton at intel.com> 
wrote:
> >> On 18 April 2016 at 14:08, Hongxu Jia <hongxu.jia at windriver.com> wrote:
> >>> If sysroot is required, override DEBUG_FLAGS to remove
> >>> -fdebug-prefix-map
> >> 
> >> We should probably get this in the release notes, as many people do
> >> indeed
> >> want remote debug to work.
> >> 
> >> Can you tell gdb the base path to use when looking for symbols?  I've not
> >> done remote GDB for some time but wouldn't "set substitute-path /
> >> //my/sysroot/" work?  Or maybe /usr /my/sysroot/usr?
> >> 
> >> If gdb can't be told then instead of having to replace all of DEBUG_FLAGS
> >> it would be neat if the prefix mapping variables where in another
> >> variable that could just be unset.
> >> 
> >> Ross
> > 
> > OK I think I could live with removing -fdebug-prefix-map for now.
> > 
> > A thought: We have the setting IMAGE_GEN_DEBUGFS - I have not yet
> > tested. As far as I understand it creates an unstripped sysroot and
> > does not affect target rootfs - is that correct? Does the sysroot
> > created by IMAGE_GEN_DEBUGFS contain the sources? If yes we could set
> > that as sysroot for gdb.
> > 
> > I think one of the problems we have here is that there is no reference
> > way documented (or it is outdated) how remote debugging is meant to be
> > performed.
> 
> Remote debugging is setup to always assume the remote side has access to a
> debugable sysroot.  This isn't the project's sysroot, since that is
> transient, but a REAL matching sysroot to the main image.
> 
> The easiest way to do this is to add the following to your local.conf:
>    IMAGE_GEN_DEBUGFS = '1'
> 
> After this, look in your deploy directory and you will see the image to
> deploy to the target, and also a matching 'debug' chunk that you keep on
> your local host.  This way you -know- they are always in sync.
> 
> There is class material from the various Yocto Project Dev Day classes on
> using this.

I thought I'd seen this go into the manual but I can't seem to find it; I also 
can't find said Dev Day class material online. Mark, would you be able to work 
with Scott R to get this documented both within the variable reference and in 
a task-oriented manner?

In the mean time, Jefro - is the recent dev day material available somewhere? 
I can only find 2014 (ELCE Dusseldorf) under "Training" on the YP website.

Thanks,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre