[Bug 224561] powerpc64: head -r327075 kldload (e.g.) of kernel modules built by clang 5.0.1 crashes the system

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224561

            Bug ID: 224561
           Summary: powerpc64: head -r327075 kldload (e.g.) of kernel
                    modules built by clang 5.0.1 crashes the system
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: markmi at dsl-only.net

[I experiment with system-clang as a means of
building FreeBSD for powerpc64 (and powerpc).]

[Note: -r326192 and its clang 5.0.0 context did
not have this issue. 5.0.1 may have added to
the range of relocation handling needed for
dynamically loaded kernel modules.]

When the powerpc64 kernel is (cross) built via
-r327075 and its clang (5.0.1), the kernel
produced crashes when dynamically loading
kernel modules (say via kldload or via
geom_label_load="YES" in /boot/loader.conf ).

By contrast, the same sources used to cross build
via devel/powerpc64-xtoolchain-gcc produces a
kernel for which the same world (not updated)
dynamically loads kernel modules just fine
(including via kldload or via
geom_label_load="YES" in /boot/loader.conf ).

Both cases are using:

devel/powerpc64-binutils

because (A) lld does not work for powerpc64
built via clang last I knew and (B) the system
binutils do not work for that kind of context
either.

I'll note that for TARGET_ARCH=powerpc clang 5
and the system binutils do not work together.
There is no devel/powerpc-binutils and last I
knew lld did not work for powerpc yet. So I've
not tested a clang based kernel for it. A gcc
4.2.1 based kernel does not have the problem.

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