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Re: [PATCH] BZ #19590: Fixed build of shared objects that use libmvec.so functions


On Wed, Feb 10, 2016 at 8:07 AM, Andrew Senkevich
<andrew.n.senkevich@gmail.com> wrote:
> 2016-02-10 16:15 GMT+03:00 H.J. Lu <hjl.tools@gmail.com>:
>> On Wed, Feb 10, 2016 at 4:58 AM, Andrew Senkevich
>> <andrew.n.senkevich@gmail.com> wrote:
>>> 2016-02-10 15:08 GMT+03:00 Florian Weimer <fweimer@redhat.com>:
>>>> On 02/10/2016 12:36 PM, Andrew Senkevich wrote:
>>>>
>>>>>  #define ALIAS_IMPL(alias, target) \
>>>>>  ENTRY (alias); \
>>>>> -       call target; \
>>>>> +       call target@PLT; \
>>>>>         ret; \
>>>>>  END (alias)
>>>>
>>>> This needs a comment why this cannot be a tail call (JMP).
>>>
>>> Yes, it should be jmp.
>>>
>>>> Out of curiosity, why is it not possible to avoid this indirection?  Why
>>>> is this logic required in libmvec_nonshared.a?
>>>
>>> It is workaround to exclude unnecessary symbol aliases in libmvec.so
>>> (BZ #19058).
>>>
>>
>> Can you fold  libmvec_nonshared.a into libmvec,so?
>
> It is possible but I am not sure it is Ok with point that unnecessary
> ABI extension should be limited..
>

Should the workaround be in GCC?  Otherwise, it will be used
even when compiler works fine.


-- 
H.J.


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