[LTP] [PATCH] ltp-cap.m4: add libcap version detection && fix compiler error

[xuyang <xuyang2018.jy@cn.fujitsu.com>]

Hi Petr

> Hi Yang,
>
>>>> At the beginning, I
>>>>     think it makes no sense because libcap-1 is too old.  But I notices that ltp-quota.m4
>>>>     has quota_v1 and quota_v2. I changes my mind.
>>>>     Since we have drop libnuma v1, I agree with you that we also drop libcap v1(too old).
>>>>     Also, I think we should drop quota_v1 because it is too old (since Linux 2.4.22, Q_GETINFO has
>>>>     been supported in kernel).
>>> Good point. But I'm not sure if it's the same, as QFMT_VFS_OLD is part of kernel
>>> source tree (part of kernel space code) so it makes sense to test it, whereas
>>> libcap v1 and libnuma v1 are just old versions of user space library.
>>> Or am I wrong?
>> Hi Petr
>>     I have seen kernel source about quota and try it. I think you are right.  But current quota_v1
>> and quota_v2 detection has problem. In kernel source, I disable CONFIG_QFMT_V2 and enable CONFIG_QFMT_V1
>> ,then I found ltp still detects quotav2 instead of quotav1,  and run ./quotactl01, the following error occurs:
> LTP detection in ltp-quota.m4 defines _LINUX_QUOTA_VERSION for detection.
> I guess you'd have to define HAVE_QUOTAV1 and undefine HAVE_QUOTAV2 in in
> include/config.h, but not tested.
>
> BTW _LINUX_QUOTA_VERSION was removed from glibc in 2.25 [1] [2], which based setup
> on<linux/quota.h>. And musl defines only _LINUX_QUOTA_VERSION 2.
>
> Regards man info that v1 is from kernel v2.4.22 we should probably also remove
> it's support.
  Thanks for your reply.

> We got a bit away from libcap :).
    :-)   let's go back to libcap. I will send a v2 patch to only fix possible compiler error.

> Kind regards,
> Petr
>
> [1] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=4d728087ef8cc826b05bd21d0c74d4eca9b1a27d;hp=de6b6d14e9b4d8e9a7333addca55163d9ebb7ff6
> [2] https://patchwork.ozlabs.org/patch/664156/
>
>
> .
>