[Buildroot] [PATCH] libselinux: use correct definition of ARCH

[Vicente Olivert Riera <Vincent.Riera@imgtec.com>]

Dear Thomas Petazzoni,

On 09/16/2015 11:39 AM, Thomas Petazzoni wrote:
> Dear Vicente Olivert Riera,
> 
> On Wed, 16 Sep 2015 11:10:03 +0100, Vicente Olivert Riera wrote:
>> The Makefile of libselinux performs the following check:
>>
>> ARCH := $(patsubst i%86,i386,$(shell uname -m))
>> ifneq (,$(filter i386,$(ARCH)))
>> TLSFLAGS += -mno-tls-direct-seg-refs
>> endif
>>
>> Which means that if the host machine is an x86, then TLSFLAGS will
>> contain -mno-tls-direct-seg-refs. That command line option causes
>> libselinux to fail when building it for target architectures where the
>> compiler doesn't support that option, i.e. MIPS:
>>
>> mips-img-linux-gnu-gcc: error: unrecognized command line option
>> ?-mno-tls-direct-seg-refs?
>>
>> So to fix that problem we can set the ARCH variable to $(KERNEL_ARCH),
>> and then append it to the LIBSELINUX_MAKE_OPTS.
>>
>> Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
> 
> Looks good to me:
> 
> Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> 
> I'm surprised we never caught this through the autobuilder testing, but
> I guess all autobuilder machines are x86_64 based, which will not
> exhibit the problem.

Yeah, I set a new autobuilder to run only MIPS builds since currently
there aren't many autobuild failures to look at (I needed more!), and I
put it on a x86 virtual machine just to also catch possible issues due
to building on a 32-bit host machine, and because I already had another
autobuilder running on a x86_64 host. And look, I have already catch one! :D

Thanks for the review.

Regards,

Vincent.

> Thanks!
> 
> Thomas
>