PATCH: Check GLIBC_IFUNC to enable/disable ifunc features

[H.J. Lu]

On Wed, Jun 29, 2016 at 8:44 PM, Siddhesh Poyarekar
<siddhesh@sourceware.org> wrote:
> On Wed, Jun 29, 2016 at 08:22:15PM -0700, H.J. Lu wrote:
>> GLIBC_IFUNC must be processed after init_cpu_features is called and before
>> any relocation is performed.  Otherwise, IFUNC won't work correctly.  Can your
>> tunable scheme support it?
>
> Yes, one of the desired use cases for tunables has been to control
> IFUNC behaviour.

Another concern is we only need to check one GLIBC_IFUNC and
done.  With GLIBC_IFUNC_X86_XXX, it becomes open ended. I
really want to avoid it.

-- 
H.J.