Tried Kernel 4.16.7 on Fedora 28 (GCC 8.0.1), and this now compiles successfully, although still with a lot of ‘warnings’..

I use grub-customizer with each new kernel, and the F28 version of this fails:

# grub-customizer
Error creating proxy: The connection is closed (g-io-error-quark, 18)
 *** initializing (w/o specified bootloader type)…
 * reading partition info…
/usr/include/c++/8/bits/basic_string.h:1048: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator[](std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference = char&; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]: Assertion '__pos <= size()' failed.
Aborted (core dumped)

Workaround, is to install the F27 version:

rpm -Uvh grub-customizer-5.0.6-6.fc27.x86_64.rpm --force

– and this works OK, again..

Robert Gadsdon.   May 2, 2018.