Re: samples/seccomp/ broken when cross compiling s390, ppc allyesconfig

[Kees Cook]

On Mon, Feb 12, 2018 at 7:25 PM, Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote:
> Michal Hocko <mhocko@xxxxxxxxxx> writes:
>> Hi,
>> my build test machinery chokes on samples/seccomp when cross compiling
>> s390 and ppc64 allyesconfig. This has been the case for quite some
>> time already but I never found time to look at the problem and report
>> it. It seems this is not new issue and similar thing happend for
>> MIPS e9107f88c985 ("samples/seccomp/Makefile: do not build tests if
>> cross-compiling for MIPS").
>>
>> The build logs are attached.
>>
>> What is the best way around this? Should we simply skip compilation on
>> cross compile or is actually anybody relying on that? Or should I simply
>> disable it for s390 and ppc?
>
> The whole thing seems very confused. It's not building for the target,
> it's building for the host, ie. the Makefile sets hostprogs-m and
> HOSTCFLAGS etc.
>
> So it can't possibly work with cross compiling as it's currently
> written.
>
> Either the Makefile needs some serious work to properly support cross
> compiling or it should just be disabled when cross compiling.

Hrm, yeah, the goal was to entirely disable cross compiling, but I
guess we didn't hit it with a hard enough hammer. :)

-Kees

-- 
Kees Cook
Pixel Security