[OE-core] [OE-Core][PATCH 1/2] libgpg-error: Support build for native on ppc host

[Serhey Popovych]

Richard Purdie wrote:
> On Sat, 2019-01-12 at 17:56 +0200, Serhey Popovych wrote:
>> Richard Purdie wrote:
>>> On Sat, 2019-01-12 at 12:11 +0200, Serhey Popovych wrote:
>>>> In Ubuntu 16.04 LTS userspace is build for PowerPC 32-bit while
>>>> kernel
>>>> selected by the installer depending on PowerPC machine type:
>>>>
>>>>   * 32-bit for PowerMac G4 (ppc7400) and below
>>>>   * 64-bit for PowerMac G5 and above
>>>>
>>>> Thus uname(2) returns ppc64 for 64-bit kernels and 32-bit
>>>> userspace
>>>> making build impossible due to missing some of lib64 multilib
>>>> equivalents in Ubuntu repository.
>>>>
>>>> Using setarch(8) override to make whole host look as PowerPC 32-
>>>> bit
>>>> can actually help with build but requires mapping for ppc target
>>>> to
>>>> their libgpg-error equivalent to fix native build.
>>>>
>>>> Build tested on Ubuntu 16.04 LTS host on PowerMac G5 with
>>>> command:
>>>>
>>>>   MACHINE=qemuppc setarch ppc bitbake core-image-full-cmdline
>>>>
>>>> Signed-off-by: Serhey Popovych <serhe.popovych at gmail.com>
>>>> ---
>>>>  meta/recipes-support/libgpg-error/libgpg-error_1.33.bb | 1 +
>>>>  1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/meta/recipes-support/libgpg-error/libgpg-
>>>> error_1.33.bb
>>>> b/meta/recipes-support/libgpg-error/libgpg-error_1.33.bb
>>>> index 325529d..4153954 100644
>>>> --- a/meta/recipes-support/libgpg-error/libgpg-error_1.33.bb
>>>> +++ b/meta/recipes-support/libgpg-error/libgpg-error_1.33.bb
>>>> @@ -47,6 +47,7 @@ do_compile_prepend() {
>>>>  	  mips*el)    TUPLE=mipsel-unknown-linux-gnu ;;
>>>>  	  mips*)      TUPLE=mips-unknown-linux-gnu ;;
>>>>  	  x86_64)     TUPLE=x86_64-unknown-linux-gnu ;;
>>>> +	  ppc)        TUPLE=powerpc-unknown-linux-gnu ;;
>>>>  	  ppc64)      TUPLE=powerpc64-unknown-linux-gnu ;;
>>>>  	  ppc64le)    TUPLE=powerpc64le-unknown-linux-gnu ;;
>>>>  	  *)          TUPLE=${TARGET_ARCH}-unknown-linux-gnu ;;
>>>
>>> This doesn't feel correct. It only works if you're using the local
>>> setarch workaround and I'm worried most users are never going to
>>> find
>>> that.
>>>
>>> I'm fine with adding in general fixes but this is getting very
>>> specific
>>> to an very uncommon usecase :(
>>
>> Understand your position. Doing setarch(8) to run bitbake on ppc64
>> kernel with 32-bit user space with missing 64-bit multilib seems to
>> be the only option.
>>
>> Anyway this change just maps ppc to corresponding tuple used by
>> libgpg-error, so with this fix we hit both
>>
>>   a) setarch(1) when kernel is 64-bit and userspace is 32-bit and
>>      no multilib
>>   b) native 32-bit powerpc host that is running as virtual machine
>> for
>>      example).
> 
> I'd understand that if this were just libgpg-error-native but our
> qemuppc builds work which I guess is why I don't quite understand what
> is wrong here?

Problem only when PowerPC 32-bit (running in VM for example) is used as
build host.

For that "uname -m" returns ppc, that mapping is missing for
libgpg-error tuple.

> 
> Cheers,
> 
> Richard
> 
> 
> 


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