On 4 Nov 2018, at 08:43, Julian Elischer <jul...@freebsd.org> wrote:
> 
> what's an ifunc?

This is a GNU extension, an "indirect function".  It allows you to
provide multiple different implementations of the same function, for
instance optimized for specific CPU types, and choose between them at
dynamic link time (e.g. at run time).

See the following for more information:

https://sourceware.org/glibc/wiki/GNU_IFUNC
https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-ifunc-function-attribute

-Dimitry

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