[Bug middle-end/78879] -fprofile-generate causes undefined reference to `____ilog2_NaN'

[coolypf at qq dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78879

--- Comment #2 from Yuan Pengfei <coolypf at qq dot com> ---
(In reply to Markus Trippelsdorf from comment #1)
> See discussion in PR72785.

I am using GCC 6.2.1. Is it the same problem?