armv7, building p7zip and -fPIC

[Guy Yur]

On 7 October 2017 at 21:40, Warner Losh <imp at bsdimp.com> wrote:
>
>
> On Sat, Oct 7, 2017 at 11:24 AM, Guy Yur <guyyur at gmail.com> wrote:
>>
>> Hi,
>>
>> Does armv7 need -fPIC when compiling?
>>
>> Building archivers/p7zip fails with:
>> /usr/bin/ld: 7zEncode.o(.text+0x2d04): unresolvable R_ARM_MOVW_ABS_NC
>> relocation against symbol `_ZTIi@@CXXABI_1.3'
>> /usr/bin/ld: final link failed: Nonrepresentable section on output
>> c++: error: linker command failed with exit code 1 (use -v to see
>> invocation)
>> *** [../../../../bin/7z.so] Error code 1
>>
>> make[3]: stopped in
>>
>> /usr/wrkdir/usr/ports/archivers/p7zip/work/p7zip_16.02/CPP/7zip/Bundles/Format7zFree
>> 1 error
>>
>> If I add "CFLAGS_armv7= -fPIC" in the port Makefile it builds fine.
>> The port has -fPIC for aarch64, amd64, powerpc and sparc64.
>>
>> Is it a difference from armv6?
>> When I previously built for armv6 it worked without the option.
>
>
> armv7 is new in FreeBSD (two days old), and maybe you are tripping over
> something inside the port that optimized for it? Is there a
> CFLAGS+armv6=-fPIC? I don't see it with a quick grep, but you never know...
> If that's what it takes to fix it, maybe you should submit that to the port
> maintainer?
>
> Warner

Hi,

Seems to indeed be a difference between armv6 and armv7,
found this: https://bugs.launchpad.net/ubuntu/+source/gcc-4.4/+bug/503448

I will submit a patch to the port maintainer to add CFLAGS for armv7.

Thanks,
Guy