[meta-xilinx] [PATCH] tune-microblaze: Pin toolchain version to 4.8.4

[Nathan Rossi]

On Thu, Nov 5, 2015 at 10:02 AM, Manjukumar Harthikote Matha
<manjukumar.harthikote-matha at xilinx.com> wrote:
> We are working on the GCC fix. Since we cannot have broken microblaze
> recipe, this is a temporary patch till the fix is available upstream

Ok that's good to hear, for reference this is the standalone test case
that can be used to reproduce the insn missing issue
(https://gist.github.com/nathanrossi/93282fa77ee05703f58c). If
you/Xilinx find the bug or have a patch please let me know, I will do
the same.

For the moment the temporary fix is to pin the version from
local.conf. Once the issue has been resolved the patch can be applied
for gcc 5.2 in meta-xilinx.

Thanks,
Nathan

>
> Thanks
> Manju
>
>
> On 11/04/2015 03:47 PM, Nathan Rossi wrote:
>>
>> On Thu, Nov 5, 2015 at 8:07 AM, Manjukumar Matha
>> <manjukumar.harthikote-matha at xilinx.com> wrote:
>>>
>>> This is because the GCCv5.2 toolchain currently breaks microblaze kernel
>>> builds. This change is temporary until a GCC fix is available.
>>
>>
>> I don't like this as it assumes a broken gcc 5.2 is acceptable, it was
>> somewhat ok to do for GDB since upstream GDB barely even supports
>> MicroBlaze (as there are a pile of patches to gdb 7.7.1). The bug you
>> are referring to currently only affects the kernel and there are work
>> arounds such as disabling size optimization, etc.
>>
>> I have a reproducible standalone test case for this issue and plan to
>> resolve it for the jethro branch. This needs to be fixed sooner rather
>> than later so that the fix can make it into the next GCC version or a
>> point release so that the issue doesn't stick around for long.
>>
>> Regards,
>> Nathan
>>
>>>
>>> Signed-off-by: Manjukumar Matha <manjukumar.harthikote-matha at xilinx.com>
>>> ---
>>>   conf/machine/include/tune-microblaze.inc | 3 +++
>>>   1 file changed, 3 insertions(+)
>>>
>>> diff --git a/conf/machine/include/tune-microblaze.inc
>>> b/conf/machine/include/tune-microblaze.inc
>>> index a5b6109..1de77d7 100644
>>> --- a/conf/machine/include/tune-microblaze.inc
>>> +++ b/conf/machine/include/tune-microblaze.inc
>>> @@ -25,3 +25,6 @@ PREFERRED_VERSION_gdb ?= "7.7.1"
>>>   PREFERRED_VERSION_gdb-cross ?= "7.7.1"
>>>   PREFERRED_VERSION_gdb-cross-canadian ?= "7.7.1"
>>>
>>> +# pin toolchain version to 4.8.4, since 5.2 breaks linux builds
>>> +GCCVERSION = "4.8.4"
>>> +SDKGCCVERSION = "4.8.4"
>>> --
>>> 2.1.4
>>>
>>> --
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