[Bug 218349] kernel built with XCC=clang36,37,38,39,40,-devel has broken iwi device

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218349

            Bug ID: 218349
           Summary: kernel built with XCC=clang36,37,38,39,40,-devel has
                    broken iwi device
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kennethsalerno at yahoo.com

It seems that unless you build world+kernel with the version of llvm/clang in
base (3.4) you'll wind up with broken WiFi. Just curious how I could go about
troubleshooting why, since everything else seems to be working.

Symptom is you can't even successfully execute "ifconfig wlan0 scan", just
returns nothing. Pretty sure it's the iwi device itself, but could be wrong.

Steps to reproduce:
XCC=/usr/local/bin/clang39
XCXX=/usr/local/bin/clang++39
XCPP=/usr/local/bin/clang-cpp39
export XCC XCXX XCPP
make -C /usr/src -j4 buildworld && make -C /usr/src -j4 buildkernel

Just would be nice to build the system with a newer LLVM/Clang version.

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