Re: ANNOUNCE: pahole v1.23 (BTF tags and alignment inference)

Yonghong Song
2021-12-09T22:09:41Z

On 12/8/21 11:11 AM, Jan Engelhardt wrote:
>
> On Wednesday 2021-12-08 19:35, Arnaldo Carvalho de Melo wrote:
>
>> Em Wed, Dec 08, 2021 at 03:26:31PM +0100, Jan Engelhardt escreveu:
>>>
>>> On Wednesday 2021-12-08 14:54, Arnaldo Carvalho de Melo wrote:
>>>>
>>>> The v1.23 release of pahole and its friends is out, this time
>>>> the main new features are the ability to encode BTF tags, to carry
>>>
>>> [ 7s] /home/abuild/rpmbuild/BUILD/dwarves-1.23/btf_encoder.c:145:10: error: 'BTF_KIND_DECL_TAG' undeclared here (not in a function); did you mean 'BTF_KIND_FLOAT'?
>>>
>>> libbpf-0.5.0 is present, since CMakeLists.txt checked for >= 0.4.0.
>>
>> My fault, knowing the flux that libbpf is in getting to 1.0 I should
>> have retested with the perf tools container based tests.
>>
>> Can you think about some fix for that? Lemme see if BTF_KIND_DECL_TAG is
>> a define or an enum...
>
> Just bumping this line
>
> pkg_check_modules(LIBBPF REQUIRED libbpf>=0.4.0)
>
> to the right version would absolutely be sufficient for us. Of course, that
> requires that the libbpf project itself at least manages to make tags
> regularly.

Change above version 0.4.0 to 0.6.0 should work as libbpf 0.6.0 contains
all the changes related to BTF_KIND_{TYPE,DECL}_TAGs.