[yocto] Selecting gcc version

[Khem Raj]

On Mon, Jun 25, 2012 at 2:57 PM, Chris Tapp <opensource at keylevel.com> wrote:
>
> On 25 Jun 2012, at 22:52, Khem Raj wrote:
>
>> On Mon, Jun 25, 2012 at 2:48 PM, Chris Tapp <opensource at keylevel.com> wrote:
>>> Yes, it's 3.1.9 and it does compile. But the latest commits don't run when I build them (system displays a 'failed to execute kernel' error screen). Paul Eggleton has failed to get any to work when built using 4.7.0 (current master), so it does look as if this is compiler-related.
>>>
>>> None of the commits appear to be likely to cause a change from 'good' to 'bad'.
>>>
>>
>> can you tell me which commit is last good ?
>> yes there are interaction between kernel and compiler
>> sometimes kernel code has wrong expectation of gcc and when it gets
>> fixed in gcc things dont work so in such cases kernel is fixed in some
>> case kernel may expose real gcc bug too. Cant tell much unless its narrowed down
>
>
> Last one I've got to work is https://github.com/raspberrypi/linux/commit/3fc65f9f291fb19cad434968a4a0f66ab749e637.
>
> I've opened an issue at https://github.com/raspberrypi/linux/commit/3fc65f9f291fb19cad434968a4a0f66ab749e637 which also shows the firmware version that I know works, but that's probably not important here.
>

well there are options in .config being changed that can mean that now
you could be waking up the sleeping dinosaurs.

> I think I've got it building under 4.5.1 (Edison, as that was easier to do for a quick test).

OK